CN112067234A

CN112067234A - Radiator performance wind tunnel test device capable of simulating multiphase flow air inlet environment

Info

Publication number: CN112067234A
Application number: CN202010951720.1A
Authority: CN
Inventors: 苗龙; 王义春; 李森; 丁扬
Original assignee: Beijing Institute of Technology BIT
Current assignee: Beijing Institute of Technology BIT
Priority date: 2020-09-11
Filing date: 2020-09-11
Publication date: 2020-12-11
Anticipated expiration: 2040-09-11
Also published as: CN112067234B

Abstract

The invention discloses a radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment, and belongs to the technical field of radiator performance test devices. The test device provided by the invention comprises a sand dust generating device, a rain generating device, an upstream section, a radiator, a hot side circulating system, a downstream section, a separation and recovery section, an induced draft fan and a measurement controller. The invention can carry out the wind tunnel test of the performance of the sand dust environment radiator with different sand dust concentrations and different sand temperature, the wind tunnel test of the performance of the rain environment radiator with different rain quantities and different rain drop temperatures, the wind tunnel test of the performance of the sand dust rain composite environment radiator, and the wind tunnel test of the performance of the conventional natural environment radiator, and has wide applicability; the parameter range of the test condition is large, and the test function is widened; the recycling of sand grains and water can be realized, and the economy is high; the air exhaust is clean, and the feasibility is high; compact structure and reduced occupied area.

Description

Radiator performance wind tunnel test device capable of simulating multiphase flow air inlet environment

Technical Field

The invention belongs to the technical field of radiator performance test devices, and particularly relates to a radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment.

Background

For movable military equipment and special equipment, a cooling system of the movable military equipment and the special equipment works efficiently, reliably and stably under the limit environmental condition, and the movable military equipment and the special equipment have important significance in ensuring high maneuverability and high reliability of the whole machine. Design studies and component selection based on related equipment cooling systems, in general terms with respect to extreme environmentsThe method comprises the following steps: such as high temperature environment with environment temperature of 45-50 ℃, plateau environment with altitude of 4000-4500 m and altitude of 3g/m³～6g/m³A sand-dust environment with sand-dust concentration, a strong rain environment with 17.5mm/24 h-20 mm/24h rain and the like in a single limit environment; and a composite limit environment formed by overlapping two or more single limit environments.

The design research and the component selection of the cooling system depend on the relevant performance of the radiator, and the main acquisition mode of the heat transfer performance and the resistance performance of the radiator at present is a wind tunnel test of the performance of the radiator. The heat transfer performance and the resistance performance of the radiator under the conventional natural environment, the high-temperature environment and the plateau environment can be obtained, and the related wind tunnel test technology and the related wind tunnel test device can be realized at present. The test technology and the device for testing the heat transfer performance and the resistance performance of the radiator in the multi-phase flow air inlet environment such as a sand dust environment, a rain environment, a sand dust and rain composite environment are fresh.

The existing wind tunnel test device for the sand-dust environment radiator is mainly used for checking the strength of the radiator, heat transfer and resistance performance tests of the radiator are not involved, an air duct of the wind tunnel is generally of a horizontal open structure, sand grains in a test flow channel are difficult to be uniformly distributed, the sand grains are easy to accumulate at the bottom of the air duct to cause flow field change, and the wind exhaust with high sand content also causes the device to be inconvenient for indoor application; the wind tunnels in the sand and dust environments with other purposes are basically horizontally arranged wind tunnels, sand grains in the wind tunnels can be accumulated after long-time use, even if sand grain recovery is considered, the effect is poor and difficult to realize, and the open structure is inconvenient for indoor application.

The existing wind tunnel test device for the rain environment is mainly used for realizing the rain working condition of the large-space environment, and the wind tunnel test device for the performance of the radiator in the rain environment is not realized by the related technology at present.

The wind tunnel test device for the performance of the radiator in the sand-dust rain composite environment is also lack of related technologies at present.

Disclosure of Invention

Aiming at the condition that a radiator performance wind tunnel test technology and a device which can simulate multi-phase flow air inlet environments such as sand-dust environment, rain environment, sand-dust rain composite environment and the like are lacked, the invention provides a radiator performance wind tunnel test device which can simulate the multi-phase flow air inlet environment, which comprises the following steps: the wind tunnel test of the performance of the sand-dust environment radiator with different sand-dust concentrations and different sand-dust temperatures, the wind tunnel test of the performance of the rain-drenching environment radiator with different rain quantities and different rain drop temperatures, and the wind tunnel test of the performance of the sand-dust rain-drenching composite environment radiator can be carried out; meanwhile, a wind tunnel test for the performance of the conventional natural environment radiator can be carried out.

The invention provides a radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment, which comprises a sand dust generating device, a rain generating device, an upstream section, a radiator, a hot side circulating system, a downstream section, a separation and recovery section, an induced draft fan and a measurement controller, wherein the sand dust generating device is connected with the upstream section; wherein:

the sand-dust generating device and the rain generating device are both arranged above the upstream section, and the height of the rain generating device is higher than that of the sand-dust generating device;

the upstream section, the radiator, the downstream section, the separation and recovery section and the induced draft fan are sequentially connected;

the hot side circulating system is connected with the hot side inlet and the hot side outlet of the radiator;

the measurement controller is connected with the sand dust generating device, the rain generating device, the upstream section, the hot side circulating system, the downstream section, the separation and recovery section and the induced draft fan through signal lines.

The sand dust generating device comprises a sand storage box, a first electric heating rod, a stirring rod, a first temperature sensor, a first electric control switch, an electric control flow valve, a feeding machine and a pulse air feeder, wherein the first electric heating rod, the stirring rod and the first temperature sensor are arranged in the sand storage box, the first temperature sensor is connected with the measuring controller in a measuring way, the power supply loop of the first electric heating rod is connected with the first electric control switch in series, the first electric control switch is in control connection with the measurement controller, the outlet of the sand storage box is connected with the electric control flow valve, the electric control flow valve is in control connection with the measurement controller, the feeder is arranged below the electric control flow valve, the feeding machine is in control connection with the measurement controller, and the pulsating air feeder is arranged below a discharge port of the feeding machine;

the sand storage box is used for receiving and storing sand grains;

the first electric heating rod is used for outputting heat flow to increase the temperature of sand grains;

the stirring rod is used for stirring and blending sand grains in the sand storage box, so that the sand grains are uniformly heated;

the first temperature sensor is used for monitoring the temperature of sand grains in the sand storage box;

the first electric control switch is used for controlling the on-off of the heat flow output by the first electric heating rod so as to control the temperature of sand grains;

the electric control flow valve is used for controlling the mass flow of sand grains passing through the valve core of the electric control flow valve so as to control the sand dust concentration;

the feeder is used for uniformly spreading sand grains and realizing the feeding and conveying of the sand grains;

the pulsating air feeder is used for blowing away sand grains to form a sand dust air feeding environment, and the pulsating air speed ensures that the sand grains are uniformly distributed in a three-dimensional space.

The rain generating device comprises a rain making box, a liquid level sensor, a second temperature sensor, an overflow pipe, an electric control motor, a pull wire, an overflow box, a water return pipe, a water feeding pump, a water storage tank, a second electric heating rod, a third temperature sensor, a second electric control switch, a water replenishing pipe and an exhaust valve, wherein the liquid level sensor and the second temperature sensor are arranged in the rain making box, the liquid level sensor and the second temperature sensor are connected with the measurement controller in a measuring way, an inlet of the overflow pipe is connected with the rain making box, an outlet of the overflow pipe is fixedly connected with one end of the pull wire, an output shaft of the electric control motor is fixedly connected with the other end of the pull wire, the electric control motor is connected with the measurement controller in a controlling way, the overflow box is arranged below an outlet of the overflow pipe, and the water return box is connected with the water storage tank through the water return, the overflow box is higher than the water storage tank, the rain making box is connected with the water storage tank through the water supply pipe connected with the water supply pump in series, the second electric heating rod and the third temperature sensor are arranged in the water storage tank, the third temperature sensor is connected with the measurement controller in a measurement mode, a power supply loop of the second electric heating rod is connected with the second electric control switch in series, the second electric control switch is connected with the measurement controller in a control mode, and the water replenishing pipe and the exhaust valve are arranged on the upper portion of the water storage tank;

the rain making box is used for generating and dropping raindrops with equivalent diameters of 2 mm-5 mm;

the liquid level sensor is used for monitoring the water level in the rain making tank;

the second temperature sensor is used for monitoring the water temperature in the rain making box;

the overflow pipe is used for limiting the height of an overflow water level in the rain making box so as to control the rain amount;

the electric control motor drives the traction line to be retracted and extended through forward and reverse rotation to realize the change of the height of the outlet of the overflow pipe;

the traction wire is used for transmitting the pulling force provided by the electric control motor;

the overflow tank is used for receiving overflow water discharged from the overflow pipe outlet;

the water return pipe is used for guiding the water in the overflow tank to be transmitted into the water storage tank;

the water supply pipe is used for guiding water in the water storage tank to be transmitted into the rain making tank;

the water feeding pump is used for providing a pressure head required for driving water transmission in the water feeding pipe;

the water storage tank is used for receiving and storing water for producing raindrops;

the second electric heating rod is used for outputting heat flow to raise the water temperature;

the third temperature sensor is used for monitoring the water temperature in the water storage tank;

the second electric control switch is used for controlling the on-off of the heat flow output by the second electric heating rod so as to control the temperature of raindrops;

the water replenishing pipe is used for replenishing water consumed in the test to the water storage tank;

the exhaust valve is used for releasing overhigh air pressure in the water storage tank.

The upstream section comprises a bell mouth, a first rectifying grid, a vertical air duct, a fourth temperature sensor protection screen, a fourth temperature sensor, a first observation window and a first pressure sensor, wherein the bell mouth, the first rectifying grid and the vertical air duct are sequentially arranged and connected from top to bottom, the fourth temperature sensor protection screen, the fourth temperature sensor, the first observation window and the first pressure sensor are sequentially arranged in the vertical air duct along the airflow flowing direction, and the fourth temperature sensor and the first pressure sensor are connected with the measurement controller in a measuring way;

the fourth temperature sensor protection screen is used for shielding discrete phase particles contained in airflow for the fourth temperature sensor, and the measuring accuracy of the fourth temperature sensor is ensured.

And the hot side circulating system is connected with the measurement controller in a measurement and control way.

The downstream section comprises a bent inclined air duct, a second pressure sensor, a particulate matter concentration sensor, a mixer, a fifth temperature sensor protection screen and a fifth temperature sensor, wherein the second pressure sensor, the particulate matter concentration sensor, the mixer, the fifth temperature sensor protection screen and the fifth temperature sensor are sequentially arranged in the bent inclined air duct along the airflow flowing direction, and the second pressure sensor, the particulate matter concentration sensor and the fifth temperature sensor are connected with the measurement controller in a measuring way;

the bent inclined air duct is used for guiding sand grains, rainwater or sand grain and rainwater mixture to flow and collect, the whole body is L-shaped, the front half section is a vertical section, the rear half section is an inclined section, and the gradient range of the bottom surface of the inclined section is 3.5% -8.75%;

the particle concentration sensor is used for monitoring the sand concentration;

the fifth temperature sensor protection screen is used for shielding discrete phase particles contained in airflow from the fifth temperature sensor, and the measurement accuracy of the fifth temperature sensor is ensured.

The separation and recovery section comprises a T-shaped separation air duct, a first sand discharge valve, a blow-down valve, a drain valve, a sand discharge box, a blow-down box, a drain pipe, a second observation window, a second rectification grid, a flow meter, an air discharge cyclone separator, a main air discharge duct, a first discharge valve, a sand conveying fan, a sand conveying air duct, a second discharge valve, a discharge box, a sand conveying cyclone separator, a second sand discharge valve and a sand conveying air discharge duct, wherein the first sand discharge valve, the blow-down valve and the drain valve are arranged at the bottom end of the T-shaped separation air duct, the sand discharge box is arranged below the first sand discharge valve, the blow-down box is arranged below the blow-down valve, one end of the drain pipe is connected with the drain valve, the other end of the drain pipe is connected with the water storage tank, the second air duct observation window is arranged on the vertical side wall in the middle of the T-shaped separation air duct, the outlet of the T-shaped separation air duct is connected with the inlet of the exhaust cyclone separator, the flowmeter is arranged between the second flow straightener and the exhaust cyclone separator, the flowmeter is connected with the measurement controller in a measurement way, the outlet of the exhaust cyclone separator is connected with the main exhaust air duct, the bottom of the exhaust cyclone separator is provided with the first discharge valve, the outlet of the first discharge valve is arranged in the sand conveying air duct, the sand conveying fan is arranged at the inlet initial end of the sand conveying air duct, the bottom position of the sand conveying air duct which is vertically below the first discharge valve is of a local low-lying structure, the second discharge valve is arranged outwards, the discharge box is arranged below the second discharge valve, the tail end of the sand conveying air duct is connected with the inlet of the sand conveying cyclone separator, and the outlet of the sand conveying cyclone separator is connected with the sand conveying exhaust air duct, the bottom of the sand feeding cyclone separator is provided with the second sand discharge valve, and the sand storage box is positioned below the second sand discharge valve;

the T-shaped separation air duct is used for separating part of sand grains to fall to the bottom when the air flow contains sand grains, and collecting and storing sand grains, rainwater or a sand grain and rainwater mixture from the bent inclined air duct when the air flow contains high moisture content and the water of a condensation part on the inner wall falls to the bottom, and simultaneously guiding the air flow to flow into the exhaust cyclone separator;

the first sand discharge valve is used for discharging sand accumulated at the bottom of the T-shaped separation air channel after a wind tunnel test for the performance of the radiator in a sand-dust environment is carried out;

the drain valve is used for discharging sand and rain mixture accumulated at the bottom of the T-shaped separation air channel after a sand and rain composite environment radiator performance wind tunnel test is carried out;

the drain valve is used for draining rainwater accumulated at the bottom of the T-shaped separation air channel after a wind tunnel test for the performance of the radiator in a rain environment is carried out;

the sand discharge box is used for receiving sand discharged from the first sand discharge valve;

the drainage box is used for receiving the sand grain rainwater mixture discharged from the drainage valve;

the drain pipe is used for guiding rainwater discharged from the drain valve to flow back into the water storage tank;

the exhaust cyclone separator is used for catching sand grains to fall to the bottom when the air flow contains sand grains, and discharging clean air flow at an outlet when the moisture content of the air flow is high and the condensed part of water falls to the bottom;

the main exhaust duct is used for guiding the clean airflow discharged from the outlet of the exhaust cyclone separator to continuously flow downstream;

the first discharge valve is used for discharging sand, rainwater or a sand and rainwater mixture accumulated at the bottom of the exhaust cyclone separator to the sand conveying air duct;

the sand feeding fan is used for pumping outside air and mixing with sand grains discharged from the lower row of the first discharge valve to form a sand-containing air flow;

the sand feeding air duct is used for guiding the sand-containing air flow to flow into the sand feeding cyclone separator;

the second discharge valve is used for discharging sand, rainwater or sand rainwater mixture accumulated in a local low-lying structure in the sand feeding air duct;

the discharge box is used for receiving the sand grains, rainwater or sand grain rainwater mixture discharged from the second discharge valve;

the sand-feeding cyclone separator is used for collecting sand grains falling to the bottom and discharging clean air at an outlet of the sand-feeding cyclone separator;

the second sand discharge valve is used for discharging sand accumulated at the bottom of the sand feeding cyclone separator downwards so as to enable the sand to fall into the sand storage box;

the sand feeding exhaust duct is used for guiding clean air discharged from the outlet of the sand feeding cyclone separator to flow into the atmospheric environment.

And the induced draft fan is in control connection with the measurement controller.

Preferably, the first electric heating rod is a spiral heating rod and is located in the middle of the sand storage box, a rotating shaft of the stirring rod is coaxial with a geometric axis of the first electric heating rod, and a blade of the stirring rod rotates at the bottom of the sand storage box to stir sand.

Preferably, the electric control flow valve is an electric adjusting ball valve.

Preferably, the feeding machine is a frequency-adjustable linear vibration type feeding machine.

Preferably, the rain making box is a perforated plate type raindrop generator, and the rain amount changes along with the change of the water level in the rain making box.

Preferably, the radiator comprises one of a plate-fin radiator, a tube-strip radiator and a fin-tube radiator.

Preferably, the particle concentration sensor is a laser type particle concentration sensor.

Preferably, the first sand discharge valve, the blowdown valve, the drain valve, the first discharge valve, the second discharge valve and the second sand discharge valve are ball valves or gate valves.

Preferably, the flowmeter is a vortex shedding flowmeter.

The invention has the following advantages:

the wind tunnel test device for the performance of the radiator, provided by the invention, realizes simulation of various multiphase flow air inlet environmental conditions and gives consideration to conventional natural air inlet environmental conditions, can be used for wind tunnel tests for the performance of the radiator in sand-dust environment, rain environment, sand-dust rain composite environment, conventional natural environment and the like, and has various working conditions and wide applicability.

The wind tunnel test device for the performance of the radiator, provided by the invention, can realize the controllable adjustment of the sand dust concentration and the rainfall, and can also control and adjust the sand temperature and the raindrop temperature, so that the parameter range of test conditions is enlarged, and the test functions are widened.

The wind tunnel test device for the performance of the radiator can realize the recycling of sand grains and water, saves material resources required by test operation and has high economical efficiency.

The wind tunnel test device for the performance of the radiator, provided by the invention, has the advantages of clean air exhaust, extremely low sand content, capability of being placed indoors for relevant test operation and research, and high feasibility.

The wind tunnel test device for the performance of the radiator provided by the invention fully utilizes the space in the height direction, has a compact structure and saves the occupied area.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic structural view of a sand dust generating apparatus according to the present invention;

FIG. 3 is a schematic structural view of the rain generating device of the present invention;

FIG. 4 is a partial view of a three-dimensional structure of a rainfall adjustment portion of the rain generating device of the present invention;

FIG. 5 is a schematic structural view of an upstream section of the present invention;

FIG. 6 is a partial view of the three-dimensional arrangement of a fourth temperature sensor protective shield and a fourth temperature sensor of the upstream section of the present invention;

FIG. 7 is a schematic view of the downstream section of the present invention;

FIG. 8 is a schematic view of the structure of the separation and recovery section of the present invention;

FIG. 9 is a diagram of a measurement control framework of the present invention;

in the figure: 1-a sand dust generating device, 2-a rain generating device, 3-an upstream section, 4-a radiator, 5-a hot side circulating system, 6-a downstream section, 7-a separation and recovery section, 8-an induced draft fan, 9-a measurement controller;

101-a sand storage box, 102-a first electric heating rod, 103-a stirring rod, 104-a first temperature sensor, 105-a first electric control switch, 106-an electric control flow valve, 107-a feeding machine, 108-a pulse air feeder;

201-rain making tank, 202-liquid level sensor, 203-second temperature sensor, 204-overflow pipe, 205-electric control motor, 206-drawing wire, 207-overflow tank, 208-water return pipe, 209-water supply pipe, 210-water supply pump, 211-water storage tank, 212-second electric heating rod, 213-third temperature sensor, 214-second electric control switch, 215-water replenishing pipe, 216-exhaust valve;

301-a horn mouth, 302-a first rectifying grid, 303-a vertical air duct, 304-a fourth temperature sensor protection screen, 305-a fourth temperature sensor, 306-a first observation window, 307-a first pressure sensor;

601-a bent inclined air duct, 602-a second pressure sensor, 603-a particulate matter concentration sensor, 604-a mixer, 605-a fifth temperature sensor protection screen, and 606-a fifth temperature sensor;

701-T type separation air duct, 702-first sand discharging valve, 703-blowdown valve, 704-water discharging valve, 705-sand discharging box, 706-blowdown box, 707-water discharging pipe, 708-second observation window, 709-second rectification grid, 710-flowmeter, 711-exhaust cyclone separator, 712-main exhaust air duct, 713-first discharging valve, 714-sand feeding fan, 715-sand feeding air duct, 716-second discharging valve, 717-discharging box, 718-sand feeding cyclone separator, 719-second sand discharging valve and 720-sand feeding exhaust air duct.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings. Wherein like elements are designated by like reference numerals and air, rain, grit, recovered grit, water flow direction, etc., for a person skilled in the art to better understand the present invention. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration and understanding only and are not intended to limit the scope of the invention.

As shown in fig. 1, a radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment comprises a sand dust generation device 1, a rain generation device 2, an upstream section 3, a radiator 4, a hot side circulation system 5, a downstream section 6, a separation recovery section 7, an induced draft fan 8 and a measurement controller 9. The sand-dust generating device 1 and the rain generating device 2 are supported by a bracket or other lifting structures and suspended above the upstream section 3, the sand-dust generating device 1 transversely generates sand-containing air flow, the rain generating device 2 vertically downwards generates raindrops, and the position of the rain generating device 2 is higher than that of the sand-dust generating device 1; the upstream section 3, the radiator 4, the downstream section 6 and the separation and recovery section 7 are sequentially connected through flanges, all joints are sealed through sealing materials such as ethylene propylene diene monomer sealing strips, and the tail end of an outlet of the separation and recovery section 7 is provided with a draught fan 8; the hot side circulating system 5 is connected with the hot side inlet and the hot side outlet of the radiator 4; the measurement controller 9 is connected with the sand dust generating device 1, the rain generating device 2, the upstream section 3, the hot side circulating system 5, the downstream section 6 and the separation and recovery section 7 through measurement signal lines, and the measurement controller 9 is connected with the sand dust generating device 1, the rain generating device 2, the hot side circulating system 5 and the draught fan 8 through control signal lines.

Next, the respective components of the test apparatus will be further explained.

As shown in fig. 2, the sand-dust generating apparatus 1 is composed of a sand storage box 101, a first electric heating rod 102, a stirring rod 103, a first temperature sensor 104, a first electric control switch 105, an electric control flow valve 106, a feeder 107, and a pulsating blower 108. The sand storage box 101 is used as sand carrying equipment for receiving and storing sand; the first electric heating rod 102 is a spiral heating rod and is coiled in the middle of the sand storage box 101; the stirring rod 103 is coaxially arranged in the middle of the first electric heating rod 102, and a paddle of the stirring rod 103 is positioned at the bottom of the sand storage box 101; a first temperature sensor 104 is arranged in the sand storage box 101; the first electric control switch 105 is connected in series in a power supply loop of the first electric heating rod 102; the electric control flow valve 106 is an electric regulating ball valve and is arranged at an outlet of the bottom surface of the sand storage box 101; the feeding machine 107 is a frequency-adjustable linear vibration type feeding machine, and a charging tray of the feeding machine is arranged below the electric control flow valve 106; the pulsating blower 108 is arranged below the discharge port of the feeder 107; the measurement signal of the first temperature sensor 104 is received by the measurement controller 9, and the opening and closing of the first electrically controlled switch 105, the opening of the electrically controlled flow valve 106, and the vibration frequency of the feeder 107 are controlled by the measurement controller 9. When a wind tunnel test of performance of the sand-dust environment radiator and a wind tunnel test of performance of the sand-dust rain composite environment radiator are carried out, the sand-dust generating device 1 works and operates. The sand grains stored in the sand storage box 101 generate macro blending flow under the rotation and the stirring of the paddle of the stirring rod 103, and are uniformly heated and heated under the action of heat flow output by the first electric heating rod 102; the first temperature sensor 104 monitors the temperature of the sand in the sand storage box 101 in real time, and when the temperature is higher than a required value, the first electric control switch 105 is switched off to cut off a power supply loop of the first electric heating rod 102, so that the further increase of the temperature of the sand is prevented, and the function of controlling the temperature of the sand is achieved; the electric control flow valve 106 automatically adjusts the mass flow of sand particles passing through a valve core of the electric control flow valve 106 according to the sand dust concentration requirement, and the stirring rod 103 above the electric control flow valve 106 rotates and stirs to ensure that the sand particles smoothly flow out; the sand falls into a material tray of the feeder 107, and is paved and transversely transferred under a certain vibration frequency, the transverse transfer rate is controlled by the vibration frequency of the feeder 107, and the sand moves out of a discharge port of the feeder 107, falls and is further spread; the air outlet of the pulsating air blower 108 faces the spread sand grain groups, the sand grain groups are blown out transversely by the pulsating oscillating air speed to generate transverse swing and spreading, sand-containing air flows uniformly distributed in a three-dimensional space are formed, and finally sand dust environments with different sand dust concentrations and different sand grain temperatures are simulated.

As shown in fig. 3, the rain generating device 2 is composed of a rain making tank 201, a liquid level sensor 202, a second temperature sensor 203, an overflow pipe 204, an electric control motor 205, a pull wire 206, an overflow tank 207, a water return pipe 208, a water supply pipe 209, a water supply pump 210, a water storage tank 211, a second electric heating rod 212, a third temperature sensor 213, a second electric control switch 214, a water replenishing pipe 215, and an exhaust valve 216. The rain making box 201 is a perforated plate type rain drop generator, and the height of the water level in the rain making box determines the amount of rain; the liquid level sensor 202 and the second temperature sensor 203 are arranged inside the rain making box 201; the inlet of the overflow pipe 204 is communicated with the side wall of the rain making tank 201, the outlet of the overflow pipe 204 is fixedly connected with one end of the pull wire 206, and the output shaft of the electric control motor 205 is fixedly connected with the other end of the pull wire 206; the overflow tank 207 is arranged below the outlet of the overflow pipe 204, the overflow tank 207 is connected with the water storage tank 211 through a water return pipe 208, and the height of the overflow tank 207 is higher than that of the water storage tank 211; the rain making tank 201 is connected with the water storage tank 211 through a water supply pipe 209, and the water supply pipe 209 is connected with a water supply pump 210 in series; the water storage tank 211 is a closed container, the upper part of which is provided with a water replenishing pipe 215 and an exhaust valve 216, and the inside of which is provided with a second electric heating rod 212 and a third temperature sensor 213; the second electric control switch 214 is connected in series in the power supply loop of the second electric heating rod 212; the measurement controller 9 receives measurement signals of the liquid level sensor 202, the second temperature sensor 203, and the third temperature sensor 213, and the rotation direction and the start/stop of the electric control motor 205, and the opening/closing of the second electric control switch 214 are controlled by the measurement controller 9. Fig. 4 shows a three-dimensional structure of the rainfall adjustment part of the rainfall generating device 2, which controls the rainfall by the cooperative work of the rainfall making tank 201, the overflow pipe 204, the electric control motor 205, the traction wire 206, the overflow tank 207 and the return pipe 208. The rain making box 201 is filled with water for making raindrops and water is continuously supplied; the height of the water level in the rain making tank 201 is determined by the height of the outlet of the overflow pipe 204, when the height of the water level in the rain making tank 201 is higher than the height of the outlet of the overflow pipe 204, water is discharged from the outlet of the overflow pipe 204, and when the height of the water level in the rain making tank 201 is lower than the height of the outlet of the overflow pipe 204, the water level rises due to continuously supplied water, and finally, the water level floats up and down at the height of the outlet of the overflow pipe 204 to reach dynamic balance; the electric control motor 205 is arranged on the side wall of the overflow tank 207, an output shaft is provided with a roller structure and is connected with an outlet of the overflow pipe 204 through the wound and lowered traction line 206, the electric control motor 205 rotates forwards or backwards according to the required rainfall amount to achieve retraction of the traction line 206, the pulling force is transmitted to the overflow pipe 204, the outlet height of the overflow pipe 204 is adjusted, and the purpose of controlling the rainfall amount is achieved; the water flowing out of the overflow pipe 204 is collected in the overflow tank 207 and flows out through the return pipe 208. When a wind tunnel test of the performance of the heat radiator in the rain environment and a wind tunnel test of the performance of the heat radiator in the sand-dust rain composite environment are carried out, the rain generator 2 works and operates. The water stored in the water storage tank 211 is heated and heated under the action of the heat flow output by the second electric heating rod 212; the third temperature sensor 213 monitors the water temperature in the water storage tank 211 in real time, and when the temperature is higher than a required value, the second electric control switch 214 is switched off to cut off a power supply loop of the second electric heating rod 212, so that the water temperature is prevented from further rising, and the function of controlling the water temperature is achieved; the water replenishing pipe 215 is manually controlled, and water replenishing operation is performed when the water quantity in the water storage tank 211 is not enough to submerge the highest point of the second electric heating rod 212; the exhaust valve 216 is used for releasing excessive air pressure in the water storage tank 211; the water supply pipe 209 guides the water supply pump 210 to pump water in the water storage tank 211 into the rain making tank 201; the water level height in the rain making tank 201 is monitored by the liquid level sensor 202 in real time, and the water temperature in the rain making tank 201 is monitored by the second temperature sensor 203 in real time; the rain making box 201 vertically drops raindrops with equivalent diameter of 2 mm-5 mm; the excess water is discharged from the outlet of the overflow pipe 204 and flows into the overflow tank 207, and flows back into the water storage tank 211 under the guidance of the water return pipe 208, and the circulation is performed, so that the rain environment with different rain amount and different rain drop temperature is finally simulated. In order to carry out a wind tunnel test on the performance of the radiator in the sand-dust rain composite environment, the sand-dust generating device 1 and the rain generating device 2 should work and operate simultaneously; to perform a wind tunnel test of the performance of a conventional natural environment radiator, the sand-dust generating device 1 and the rain generating device 2 should stop operating simultaneously.

As shown in fig. 5, the upstream section 3 is composed of a bell mouth 301, a first flow straightener 302, a vertical air duct 303, a fourth temperature sensor protection screen 304, a fourth temperature sensor 305, a first observation window 306, and a first pressure sensor 307. The bell mouth 301, the first rectifying grid 302 and the vertical air duct 303 are sequentially arranged and connected from top to bottom in a welding or flange connection mode; a fourth temperature sensor protection screen 304, a fourth temperature sensor 305, a first observation window 306 and a first pressure sensor 307 are sequentially arranged in the square cylindrical vertical air duct 303 along the airflow flowing direction; the measurement signals of the fourth temperature sensor 305 and the first pressure sensor 307 are received by the measurement controller 9. The whole upstream section 3 is vertically arranged, and plays a role of guiding airflow from top to bottom during testing; the fourth temperature sensor 305 monitors the temperature of the airflow in real time, and the first pressure sensor 307 monitors the pressure of the airflow in real time; the first observation window 306 is used for the operator to observe the working operation condition in the upstream section 3 in real time. Fig. 6 is a partial view of a three-dimensional arrangement of a fourth temperature sensor protection screen 304 and a fourth temperature sensor 305 in the upstream section 3, wherein the fourth temperature sensor protection screen 304 is located above the fourth temperature sensor 305, shields discrete phase particles contained in an air flow, and prevents a flow boundary layer and a temperature boundary layer at a temperature measurement contact point of the fourth temperature sensor 305 from being damaged, thereby ensuring the accuracy of measurement of the fourth temperature sensor 305; also shown is a first viewing window 306 disposed on the vertical air duct 303 through which an operator may view to further ensure that the fourth temperature sensor 305 is not affected by the discrete phase particles in the air stream during the test.

The radiator 4 is in the form of one of a plate-fin radiator, a tube-strip radiator and a tube-fin radiator, and the width and height dimensions of the radiator are matched with those of the vertical air duct 303.

The hot side circulating system 5 realizes the functions of heat source input, circulating flow and flow regulation of a hot side circulating medium, temperature detection of an inlet and an outlet of the hot side of the radiator and the like of the whole set of test device. The composition structure and the working principle of the hot-side circulation system 5 are conventional in the art, and are not the focus of the present invention, and detailed descriptions thereof are omitted. The measurement signal output and the execution signal input therein are interacted by the measurement controller 9.

As shown in fig. 7, the downstream section 6 is composed of a bent inclined air duct 601, a second pressure sensor 602, a particulate matter concentration sensor 603, a mixer 604, a fifth temperature sensor protection screen 605, and a fifth temperature sensor 606. The bent inclined air duct 601 is integrally L-shaped, the front half section is a vertical section, the rear half section is an inclined section, the gradient range of the bottom surface of the inclined section is 3.5% -8.75%, and the bent inclined air duct is used for guiding sand grains, rainwater or sand grain rainwater mixture to flow and collect, changing the arrangement direction of the test device and the flow direction of internal fluid from vertical to horizontal; a second pressure sensor 602, a particulate matter concentration sensor 603, a mixer 604, a fifth temperature sensor protection screen 605 and a fifth temperature sensor 606 are sequentially arranged in the bent inclined air duct 601 along the airflow flowing direction; the second pressure sensor 602 is arranged inside the vertical section of the bent inclined air duct 601; the particulate matter concentration sensor 603 is a laser type particulate matter concentration sensor and is arranged on the top surface of the inclined section of the bent inclined air duct 601; the working principle of the fifth temperature sensor protection screen 605 and the fifth temperature sensor 606 is the same as that of the fourth temperature sensor protection screen 304 and the fourth temperature sensor 305, and details are not repeated herein; the measurement signals of the second pressure sensor 602, the particulate matter concentration sensor 603, and the fifth temperature sensor 606 are received by the measurement controller 9. During testing, airflow flows in the bent inclined air duct 601, sand, rainwater or a sand rainwater mixture is deposited while flowing, and the deposited sand, rainwater or sand rainwater mixture flows downstream along the bottom surface of the inclined section of the bent inclined air duct 601; the second pressure sensor 602 monitors the airflow pressure in real time, and when the absolute pressure before and after the cold side of the radiator 4 is not required to be measured, the second pressure sensor 602 and the first pressure sensor 307 can be equivalently replaced by a differential pressure transmitter; the particle concentration sensor 603 monitors the sand concentration in real time; the air flow is fully mixed after flowing through the mixer 604, and the temperature tends to be consistent; the fifth temperature sensor 606 monitors the airflow temperature in real time.

As shown in fig. 8, the separation and recovery section 7 is composed of a T-shaped separation air duct 701, a first sand discharge valve 702, a blow-down valve 703, a blow-down valve 704, a sand discharge tank 705, a blow-down tank 706, a water discharge pipe 707, a second observation window 708, a second flow straightener 709, a flow meter 710, a wind discharge cyclone 711, a main wind discharge duct 712, a first discharge valve 713, a sand feeding fan 714, a sand feeding air duct 715, a second discharge valve 716, a discharge tank 717, a sand feeding cyclone 718, a second sand discharge valve 719, and a sand feeding exhaust duct 720. The first sand discharge valve 702, the blowdown valve 703 and the water discharge valve 704 are ball valves or gate valves and are arranged at the bottom end of the T-shaped separation air duct 701; the sand discharging box 705 is arranged below the first sand discharging valve 702, the sewage draining box 706 is arranged below the sewage draining valve 703, one end of the water draining pipe 707 is connected with the water draining valve 704, and the other end is connected with the water storage tank 211 of the rain generating device 2; the second observation window 708 is arranged on the vertical side wall in the middle of the T-shaped separation air duct 701, so that an operator can observe the working operation condition in the T-shaped separation air duct 701 in real time, and the opening and closing time of the first sand valve 702, the blowdown valve 703 and the drain valve 704 can be determined; a second rectifying grid 709 is arranged at the top of the T-shaped separation air duct 701 to obtain uniform airflow; the outlet of the T-shaped separation air duct 701 is connected with the inlet of the exhaust cyclone 711; a flow meter 710 is arranged between the second flow straightener 709 and the exhaust cyclone 711, and the flow meter 710 is a vortex shedding flow meter; the outlet of the exhaust cyclone 711 is connected to the main exhaust duct 712; the bottom of the exhaust cyclone 711 is provided with a first discharge valve 713, the first discharge valve 713 is a ball valve or a gate valve, and the outlet of the first discharge valve 713 is arranged in the sand feeding air duct 715; the sand feeding fan 714 is arranged at the inlet starting end of the sand feeding air duct 715; the bottom surface of the sand feeding air duct 715 vertically below the first discharge valve 713 is in a local low-lying structure, and a second discharge valve 716 is arranged at the low-lying position outwards, and the second discharge valve 716 is a ball valve or a gate valve; the discharge tank 717 is disposed below the second discharge valve 716; the tail end of the sand feeding air channel 715 is connected with an inlet of a sand feeding cyclone 718, and an outlet of the sand feeding cyclone 718 is connected with a sand feeding exhaust air channel 720; a second sand discharge valve 719 is arranged at the bottom of the sand feeding cyclone 718, the second sand discharge valve 719 is a ball valve or a gate valve, and the sand storage tank 101 of the sand dust generating device 1 is positioned below the second sand discharge valve 719; the measurement signal of the flow meter 710 is received by the measurement controller 9.

When a wind tunnel test of the performance of the radiator in the dust and sand environment is carried out, the first sand discharge valve 702, the blowdown valve 703, the drain valve 704, the first discharge valve 713, the second discharge valve 716 and the second sand discharge valve 719 are closed, and the sand sending fan 714 is stopped; the sand-containing air flow passes through the T-shaped separation air duct 701, part of sand grains fall and deposit, and are stored at the bottom of the T-shaped separation air duct 701 together with sand grains flowing in from the bent inclined air duct 601 of the downstream section 6, and the rest of the sand-containing air flow flows into the exhaust cyclone 711 under the guidance of the air duct; the flow meter 710 monitors the airflow in real time; the airflow flows in the exhaust cyclone 711, sand particles are captured and fall to the bottom of the separator, and the clean airflow continues downstream under the guidance of the main exhaust duct 712. It should be clear here that a clean air flow refers to an air flow which contains no sand particles or very little sand, irrespective of the air moisture content. After the test is finished or when enough sand grains are arranged at the bottom of the T-shaped separation air duct 701 and the bottom of the exhaust cyclone 711, stopping air flow, opening the first sand discharge valve 702, closing the blow-down valve 703 and the water discharge valve 704, receiving the sand grains discharged from the first sand discharge valve 702 by the sand discharge tank 705, and refilling and supplementing the sand grains in the sand discharge tank 705 into the sand storage box 101 of the sand dust generating device 1 to realize the recycling of sand grains; the sand feeding fan 714 is started to pump outside air, the first discharging valve 713 is opened, the second discharging valve 716 is closed, sand grains stored at the bottom of the exhaust cyclone 711 are discharged downwards into the sand feeding air duct 715 and mixed with flowing high-speed air flow to form sand-containing air flow, the air flow is guided by the sand feeding air duct 715 to flow into the sand feeding cyclone 718, the sand grains are collected and fall into the bottom of the separator, clean air is discharged from an outlet of the sand feeding cyclone 718 and flows into the atmosphere under the guidance of the sand feeding exhaust duct 720, when the sand grains at the bottom of the sand feeding cyclone 718 are enough, the sand feeding fan 714 is stopped, the first discharging valve 713 is closed, sand grains are accumulated under the lower row of the second sand discharging valve 719, the sand grains fall into the sand storage box 101 of the sand dust generating device 1, and sand grain material recycling is achieved. When redundant sand grains are stored in a local low-lying structure of the sand feeding air channel 715, the sand feeding fan 714 is stopped, the first discharge valve 713 is closed, the second discharge valve 716 is opened, the discharge box 717 receives the sand grains discharged from the second discharge valve 716, and the sand grains in the discharge box 717 can be refilled and supplemented into the sand storage box 101 of the sand dust generating device 1, so that the sand grain materials can be recycled.

When a wind tunnel test for the performance of the radiator in the rain environment is carried out, the first sand discharge valve 702, the blowdown valve 703, the drain valve 704, the first discharge valve 713, the second discharge valve 716 and the second sand discharge valve 719 are closed, and the sand sending fan 714 is stopped; the high-humidity airflow flows through the T-shaped separation air duct 701, part of condensed water flows down along the inner wall and is stored at the bottom of the T-shaped separation air duct 701 together with rainwater flowing in from the bent inclined air duct 601 of the downstream section 6, and the rest of the high-humidity airflow flows into the exhaust cyclone 711 under the guidance of the air duct; the flow meter 710 monitors the airflow in real time; the airflow flows in the exhaust cyclone 711, part of the condensed water flows down along the inner wall and falls into the bottom of the separator, and the clean airflow continues to flow downstream under the guidance of the main exhaust duct 712. After the test is finished or when enough rainwater exists at the bottom of the T-shaped separation air duct 701 and the bottom of the exhaust cyclone 711, stopping airflow flowing, opening the drain valve 704, closing the first sand drain valve 702 and the drain valve 703, and leading rainwater discharged from the drain valve 704 to flow back to the water storage tank 211 of the rain generating device 2 through the drain pipe 707 to realize the recycling of fresh water materials; the sand sending fan 714 is stopped, the first discharging valve 713 is opened, rainwater at the bottom of the exhaust cyclone 711 is discharged to a local low-lying structure of the sand sending air duct 715, the second discharging valve 716 is opened, and the discharging box 717 receives rainwater discharged from the second discharging valve 716.

When a wind tunnel test for performance of the radiator in the sand-dust and rain composite environment is carried out, the first sand discharge valve 702, the blow-down valve 703, the water discharge valve 704, the first discharge valve 713, the second discharge valve 716 and the second sand discharge valve 719 are closed, and the sand feeding fan 714 is stopped; the high-humidity sand-containing airflow flows through the T-shaped separation air duct 701, part of sand falls and deposits, part of condensed water flows down along the inner wall and is stored at the bottom of the T-shaped separation air duct 701 together with sand and rainwater mixture flowing in from the bent inclined air duct 601 of the downstream section 6, and the rest high-humidity sand-containing airflow flows into the exhaust cyclone 711 under the guidance of the air duct; the flow meter 710 monitors the airflow in real time; the airflow flows in the exhaust cyclone 711, sand particles are captured and fall to the bottom of the separator, sand particle rainwater mixture is formed by the sand particles and part of the flowing condensed water and stored at the bottom of the exhaust cyclone 711, and the clean airflow is guided by the main exhaust duct 712 to flow continuously downstream. After the test is finished or when the sand grain rainwater mixture at the bottom of the T-shaped separation air duct 701 and the bottom of the exhaust cyclone 711 is enough, the air flow is stopped, the blow-down valve 703 is opened, the first sand discharge valve 702 and the drain valve 704 are closed, the blow-down tank 706 receives the sand grain rainwater mixture discharged from the blow-down valve 703, the sand grain rainwater mixture in the blow-down tank 706 cannot be reused in a short time, and after the sand grain rainwater mixture is fully dried, the sand grain rainwater mixture can be refilled and supplemented into the sand storage box 101 of the sand dust generation device 1, so that the sand grain materials can be recycled; the sand sending fan 714 is shut down, the first discharging valve 713 is opened, the sand grain rainwater mixture at the bottom of the exhaust cyclone 711 is discharged downwards to a local low-lying structure of the sand sending air duct 715, the second discharging valve 716 is opened, the discharging box 717 receives the sand grain rainwater mixture discharged from the second discharging valve 716, the sand grain rainwater mixture in the discharging box 717 cannot be reused in a short time, and after the sand grain rainwater mixture is fully dried, the sand grain rainwater mixture can be refilled and supplemented into the sand storage box 101 of the sand dust generating device 1, so that sand grain materials can be recycled.

When a wind tunnel test of the performance of a conventional natural environment radiator is carried out, the first sand discharge valve 702, the blowdown valve 703, the drain valve 704, the first discharge valve 713, the second discharge valve 716 and the second sand discharge valve 719 are closed, and the sand sending fan 714 is stopped; clean airflow continues to flow downstream after flowing through the T-shaped separation air duct 701, the exhaust cyclone 711 and the main exhaust air duct 712; the flow meter 710 monitors the airflow in real time.

The induced draft fan 8 receives a control signal sent by the measurement controller 9, and the start, stop and rotation speed of the induced draft fan are controlled by the measurement controller 9. During the test, draught fan 8 opens, provides the pressure head for the flow of the cold side cooling air of radiator 4, takes out clean air current from test device simultaneously.

As shown in fig. 9, measurement signal lines are connected between the measurement controller 9 and the first temperature sensor 104, the liquid level sensor 202, the second temperature sensor 203, the third temperature sensor 213, the fourth temperature sensor 305, the first pressure sensor 307, the hot-side circulation system 5, the second pressure sensor 602, the particulate matter concentration sensor 603, the fifth temperature sensor 606, and the flow meter 710; control signal lines are connected between the measurement controller 9 and the first electric control switch 105, the electric control flow valve 106, the feeding machine 107, the electric control motor 205, the second electric control switch 214, the hot-side circulating system 5 and the induced draft fan 8. The measurement controller 9 receives and records each input measurement signal in real time, finishes the acquisition of test data, and outputs a control signal to each relevant actuator according to a preset control logic to finish the control and adjustment of test parameters.

From the above, it is clear that the test device of the present invention has several advantages:

the wind tunnel test device has the advantages that various multiphase flow air inlet environmental conditions are simulated, the conventional natural air inlet environmental conditions are considered, the wind tunnel test for the performance of the radiator such as a sand-dust environment, a rain environment, a sand-dust rain composite environment, a conventional natural environment and the like can be performed, the working conditions are various, and the applicability is wide.

The sand temperature and the raindrop temperature can be controlled and adjusted while the sand concentration and the raining amount are controlled and adjusted, the parameter range of test conditions is enlarged, and the test functions are widened.

The recycling of sand grains and water can be realized, the material resources required by test operation are saved, and the economy is high.

The air exhaust is clean, the sand content is very little, the air exhaust device can be placed indoors for relevant test operation and research, and the feasibility is high.

The space in the height direction is fully utilized, the structure is compact, and the occupied area is saved.

Finally, it is noted that the above description is only an exemplary embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, equivalent variations and modifications made according to the technical idea of the present invention still fall within the protection scope of the present invention.

Claims

1. A radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment is characterized by comprising a sand dust generating device, a rain generating device, an upstream section, a radiator, a hot side circulating system, a downstream section, a separation and recovery section, an induced draft fan and a measurement controller; wherein:

2. The radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment according to claim 1, wherein the dust generator comprises a sand storage box, a first electric heating rod, a stirring rod, a first temperature sensor, a first electric control switch, an electric control flow valve, a feeding machine and a pulse air feeder, wherein the first electric heating rod, the stirring rod and the first temperature sensor are arranged in the sand storage box, the first temperature sensor is connected with the measurement controller in a measurement manner, a power supply loop of the first electric heating rod is connected with the first electric control switch in series, the first electric control switch is connected with the measurement controller in a control manner, an outlet of the sand storage box is connected with the electric control flow valve, the electric control flow valve is connected with the measurement controller in a control manner, and the feeding machine is arranged below the electric control flow valve, the feeding machine is in control connection with the measurement controller, and the pulsating air feeder is arranged below a discharge port of the feeding machine;

the sand storage box is used for receiving and storing sand grains;

3. The wind tunnel test device for the performance of the radiator capable of simulating a multiphase flow wind inlet environment according to claim 1, wherein the rain generator comprises a rain making tank, a liquid level sensor, a second temperature sensor, an overflow pipe, an electric control motor, a pull wire, an overflow tank, a water return pipe, a water supply pump, a water storage tank, a second electric heating rod, a third temperature sensor, a second electric control switch, a water replenishing pipe and an exhaust valve, wherein the liquid level sensor and the second temperature sensor are arranged in the rain making tank, the liquid level sensor and the second temperature sensor are connected with the measurement controller in a measurement mode, an inlet of the overflow pipe is connected with the rain making tank, an outlet of the overflow pipe is fixedly connected with one end of the pull wire, an output shaft of the electric control motor is fixedly connected with the other end of the pull wire, and the electric control motor is connected with the measurement controller in a control mode, the overflow box is arranged below the outlet of the overflow pipe, the overflow box is connected with the water storage tank through the water return pipe, the position of the overflow box is higher than that of the water storage tank, the rain making box is connected with the water storage tank through the water supply pipe connected with the water supply pump in series, the second electric heating rod and the third temperature sensor are arranged in the water storage tank, the third temperature sensor is connected with the measurement controller in a measurement mode, the power supply loop of the second electric heating rod is connected with the second electric control switch in series, the second electric control switch is connected with the measurement controller in a control mode, and the water replenishing pipe and the exhaust valve are arranged on the upper portion of the water storage tank;

4. The radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment according to claim 1, wherein the upstream section comprises a bell mouth, a first rectifying grid, a vertical air duct, a fourth temperature sensor protection screen, a fourth temperature sensor, a first observation window and a first pressure sensor, wherein the bell mouth, the first rectifying grid and the vertical air duct are sequentially arranged and connected from top to bottom, the fourth temperature sensor protection screen, the fourth temperature sensor, the first observation window and the first pressure sensor are sequentially arranged in the vertical air duct along an airflow flowing direction, and the fourth temperature sensor and the first pressure sensor are connected with the measurement controller in a measuring manner;

5. The wind tunnel test device for performance of the radiator capable of simulating the multiphase flow wind inlet environment according to claim 1, wherein the hot side circulating system is connected with the measurement controller in a measurement and control mode.

6. The radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment according to claim 1, wherein the downstream section comprises a bent inclined air duct, a second pressure sensor, a particulate matter concentration sensor, a mixer, a fifth temperature sensor protection screen and a fifth temperature sensor, wherein the second pressure sensor, the particulate matter concentration sensor, the mixer, the fifth temperature sensor protection screen and the fifth temperature sensor are sequentially arranged in the bent inclined air duct along an air flow direction, and the second pressure sensor, the particulate matter concentration sensor and the fifth temperature sensor are connected with the measurement controller in a measurement mode;

7. The heat radiator performance wind tunnel test device capable of simulating a multiphase flow air inlet environment according to claim 1, wherein the separation and recovery section comprises a T-shaped separation air duct, a first sand discharge valve, a blow-down valve, a drain valve, a sand discharge box, a blow-down box, a drain pipe, a second observation window, a second flow straightener, a flow meter, a cyclone air separator for air discharge, a main exhaust duct, a first discharge valve, a sand feeding fan, a sand feeding air duct, a second discharge valve, a discharge box, a sand feeding cyclone separator, a second sand discharge valve and a sand feeding exhaust duct, wherein the first sand discharge valve, the blow-down valve and the drain valve are arranged at the bottom end of the T-shaped separation air duct, the sand discharge box is arranged below the first sand discharge valve, the blow-down box is arranged below the blow-down valve, one end of the drain pipe is connected with the drain valve, the other end of the drain pipe is connected with the water storage tank, the second observation window is arranged on a vertical side wall in the, the top of the T-shaped separation air duct is provided with the second rectifying grid, the outlet of the T-shaped separation air duct is connected with the inlet of the exhaust cyclone separator, the flowmeter is arranged between the second rectifying grid and the exhaust cyclone separator, the flowmeter is connected with the measurement controller in a measurement manner, the outlet of the exhaust cyclone separator is connected with the main exhaust air duct, the bottom of the exhaust cyclone separator is provided with the first discharge valve, the outlet of the first discharge valve is arranged in the sand feeding air duct, the sand feeding fan is arranged at the inlet initial end of the sand feeding air duct, the bottom position of the sand feeding air duct vertically below the first discharge valve is of a local low-lying structure, the second discharge valve is arranged outwards, the discharge box is arranged below the second discharge valve, and the tail end of the sand feeding air duct is connected with the inlet of the sand feeding cyclone separator, the outlet of the sand feeding cyclone separator is connected with the sand feeding exhaust duct, the bottom of the sand feeding cyclone separator is provided with the second sand discharge valve, and the sand storage box is positioned below the second sand discharge valve;

8. The wind tunnel test device for performance of the radiator capable of simulating the multiphase flow air inlet environment according to claim 1, wherein the induced draft fan is in control connection with the measurement controller.

9. The wind tunnel test device for testing the performance of the radiator capable of simulating the multi-phase flow air inlet environment according to claim 2, wherein the first electric heating rod is a spiral heating rod and is located in the middle of the sand storage box, the rotating shaft of the stirring rod is coaxial with the geometric axis of the first electric heating rod, and the paddle of the stirring rod rotates and stirs sand grains at the bottom of the sand storage box.

10. The wind tunnel test device for radiator performance capable of simulating multiphase flow air inlet environment according to claim 2, wherein the electric control flow valve is an electric regulating ball valve.

11. The wind tunnel test device for radiator performance capable of simulating multiphase flow air inlet environment according to claim 2, wherein the feeding machine is a frequency-adjustable linear vibration type feeding machine.

12. The wind tunnel test device for testing the performance of the radiator capable of simulating the multiphase flow wind inlet environment according to claim 3, wherein the rain making box is a perforated plate type rain drop generator, and the rain amount changes along with the change of the water level in the rain making box.

13. The wind tunnel test device for performance of the radiator capable of simulating the multiphase flow air inlet environment according to claim 1, wherein the radiator comprises one of a plate-fin radiator, a tube-band radiator and a tube-fin radiator.

14. The wind tunnel test device for radiator performance capable of simulating multiphase flow air inlet environment according to claim 6, wherein the particulate matter concentration sensor is a laser type particulate matter concentration sensor.

15. The wind tunnel test device for testing the performance of the radiator capable of simulating a multiphase flow air inlet environment according to claim 7, wherein the first sand discharge valve, the blowdown valve, the drain valve, the first discharge valve, the second discharge valve and the second sand discharge valve are ball valves or gate valves.

16. The wind tunnel test device for performance of the radiator capable of simulating the multiphase flow wind inlet environment according to claim 7, wherein the flow meter is a vortex shedding flow meter.