CN109582057B - Environmental wind tunnel temperature control system - Google Patents
Environmental wind tunnel temperature control system Download PDFInfo
- Publication number
- CN109582057B CN109582057B CN201811333723.8A CN201811333723A CN109582057B CN 109582057 B CN109582057 B CN 109582057B CN 201811333723 A CN201811333723 A CN 201811333723A CN 109582057 B CN109582057 B CN 109582057B
- Authority
- CN
- China
- Prior art keywords
- temperature
- pipeline
- wind tunnel
- secondary refrigerant
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
The invention discloses an environmental wind tunnel temperature control system, which comprises a wind tunnel heat exchanger, a main pipe loop and a plurality of heat exchange branches, wherein the wind tunnel heat exchanger is arranged at an expansion section of a wind tunnel, the main pipe loop is a pipeline communicated with an inlet and an outlet of the wind tunnel heat exchanger, the plurality of heat exchange branches are connected in parallel on the main pipe loop and can independently circulate by means of the main pipe loop, each heat exchange branch comprises a secondary refrigerant circulating unit and a heat exchange circulating unit, each secondary refrigerant circulating unit comprises a flow-removing pipeline, a return pipeline, a driving pump, a three-way valve and an adjusting branch, the flow-removing pipeline is communicated with the main pipe loop and the heat exchange circulating unit, a three-way valve and a driving pump are sequentially installed on the flow removing pipeline along the flow direction, a return pipeline is communicated with the main pipe loop and the heat exchange circulating unit at the downstream of the flow removing pipeline, and the flow removing pipeline and the return pipeline are communicated by the aid of the three-way valve. The invention adopts the three-way valve to change the mixing proportion according to the temperature feedback, has unique variable and is simple to adjust.
Description
Technical Field
The invention relates to an environment wind tunnel temperature control system, in particular to a temperature control system for an automobile environment simulation wind tunnel test.
Background
The environment wind tunnel is mainly used for relevant test works such as matching research and development of air conditioning systems and cooling systems of aircrafts, automobiles, trains and other vehicles, thermal management verification and the like, researches on influences of different environmental factors on the performance of test products and system matching optimization of power propulsion systems, and examines the environmental adaptability of the test products. The environmental wind tunnel generally simulates climate factors such as high temperature, low temperature, rainfall, snowfall, illumination and the like.
The environmental wind tunnel temperature control system is a key system of an environmental wind tunnel and is mainly used for controlling the air temperature in the environmental wind tunnel. The temperature control system mainly comprises a low-temperature refrigeration system, a cooling water system, a secondary refrigerant system and the like.
The high-temperature and low-temperature process design and adjustment mode of the existing environment wind tunnel temperature control system is not high in adjustment precision and large in energy consumption, if the high temperature is directly heated by a pipeline electric heater, a heat exchange circulating system is adjusted by more than two control valves, the low temperature is subjected to heat exchange by a low-temperature refrigerating system and a secondary refrigerant system to realize a low-temperature test, the cooling water system and the secondary refrigerant system are mutually independent and do not have direct heat exchange and the like, so that the environment wind tunnel temperature control precision is not high, the change of the heat load of the environment wind tunnel test cannot be quickly and accurately responded, and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the defects in the prior art are overcome, a novel operation principle of the environment wind tunnel temperature control system is designed, and high-precision, quick-response, efficient and energy-saving temperature control of the environment wind tunnel can be realized.
The environmental wind tunnel temperature control system comprises a wind tunnel heat exchanger, a main pipe loop and a plurality of heat exchange branches, wherein the wind tunnel heat exchanger is arranged at an expansion section of a wind tunnel and is used for integrally adjusting the fluid temperature of the wind tunnel, the main pipe loop is a pipeline communicated with an inlet and an outlet of the wind tunnel heat exchanger, the plurality of heat exchange branches are connected in parallel on the main pipe loop and can independently circulate by means of the main pipe loop respectively so as to refrigerate or heat fluid in the wind tunnel by the wind tunnel heat exchanger, the heat exchange branches comprise a secondary refrigerant circulating unit and a heat exchange circulating unit, the secondary refrigerant circulating unit comprises a flow-removing pipeline, a return pipeline, a driving pump, a three-way valve and an adjusting branch, the flow-removing pipeline is communicated with the main pipe loop and the heat exchange circulating unit, and the three-way valve and the driving pump are sequentially arranged on the flow-removing pipeline along the flow direction, the return pipeline is communicated with the main pipeline loop and the heat exchange circulating unit at the downstream of the flow removal pipeline, so that the secondary refrigerant flowing out of the outlet of the wind tunnel heat exchanger can flow into the heat exchange circulating unit through the main pipeline loop and the flow removal pipeline by means of a three-way valve, flows into the wind tunnel heat exchanger through the return pipeline and the main pipeline loop after heat exchange is carried out, and the adjusting branch is communicated with the flow removal pipeline and the return pipeline by means of the three-way valve.
Preferably, the heat exchange branch comprises a heating circulation branch and a refrigerating circulation branch.
Preferably, the heat exchange circulation unit of the heating circulation branch comprises a secondary refrigerant heating heat exchanger, a cold water pipeline, a hot water pipeline and a hot water drive pump, the flow-out pipeline and the return pipeline are respectively communicated with an inlet and an outlet of the secondary refrigerant unit in the secondary refrigerant heating heat exchanger, the cold water pipeline and the hot water pipeline are respectively communicated with the heating unit of the secondary refrigerant heating heat exchanger and the hot water pump, and the hot water drive pump is installed on the hot water pipeline.
Preferably the refrigeration cycle branch road includes normal atmospheric temperature refrigeration cycle branch road and low temperature refrigeration cycle branch road, the two coolant circulating unit shares one section respectively and goes to flow pipeline and one section return line, sharing go to flow pipeline and go to install three-way valve, level pressure expansion tank and buffer tank in proper order along the flow direction on, the pipeline that goes of buffer tank low reaches divides the normal atmospheric temperature to go to flow along the way and goes to flow along the way with the low temperature to go to flow along the way, installs the driving pump respectively on these two branches and communicates with respective heat exchange cycle unit respectively, return line also divides the normal atmospheric temperature to flow back along the way and the low temperature flows back along the way and communicates with respective heat exchange cycle unit respectively.
Preferably, the heat exchange circulation unit of the normal-temperature refrigeration branch comprises a secondary refrigerant cooling heat exchanger, a normal-temperature control valve, a normal-temperature drive pump, a normal-temperature cold water pipeline, a normal-temperature hot water pipeline and a water supply unit, the normal-temperature flow-removing branch and the normal-temperature return branch are respectively communicated with an inlet and an outlet of the secondary refrigerant unit in the secondary refrigerant cooling heat exchanger, the water supply unit comprises a cooling water hot water tank, a cooling water tank, a cooling water tower and a cooling water tower water return pump, the cooling water hot water tank and the cooling water tank are respectively communicated with the cooling water tower through pipelines, the cooling water tower water return pump is arranged on a pipeline communicating the cooling water hot water tank with the cooling water tower, the normal-temperature cold water pipeline is communicated with the secondary refrigerant cooling heat exchanger and the cooling water tank, and the normal-temperature hot water pipeline is communicated with the secondary cooling heat exchanger and the cooling water refrigerant, the normal temperature control valve is installed on the normal temperature hot water pipeline, and the normal temperature driving pump is installed on the normal temperature cold water pipeline.
Preferably, the heat exchange circulation unit of the low-temperature refrigeration branch comprises a low-temperature refrigeration system, a low-temperature control valve, a low-temperature drive pump, a low-temperature cold water pipeline, a low-temperature hot water pipeline and the water supply unit, the low-temperature flow-out branch and the low-temperature return branch are respectively communicated with an inlet and an outlet of a secondary refrigerant unit in the low-temperature refrigeration system, the low-temperature cold water pipeline is communicated with the low-temperature refrigeration system and the cooling water tank, the low-temperature hot water pipeline is communicated with the low-temperature refrigeration system and the cooling water hot water tank, the low-temperature control valve is installed on the low-temperature hot water pipeline, and the low-temperature drive pump is installed on the low-temperature cold water pipeline.
Preferably, the system further comprises an adjusting branch, wherein the adjusting branch is communicated with the flow-removing pipeline in front of and behind the three-way valve through a pipeline, and the pipeline is provided with an adjusting three-way valve.
Preferably, the temperature adjusting step range of the normal-temperature refrigerating unit is 35-50 ℃, and the temperature adjusting step range of the low-temperature refrigerating unit is not more than 35.
Preferably, the temperature regulation range of the heating circulation branch is more than or equal to 50 ℃.
Preferably, temperature sensors are respectively installed at the position, located at the upstream of the wind tunnel heat exchanger, of the wind tunnel, on the normal-temperature hot water pipeline and the low-temperature hot water pipeline, and the three-way valve, the normal-temperature control valve and the low-temperature control valve can be respectively controlled and adjusted according to data measured by the temperature sensors, so that the temperature in the wind tunnel can be accurately controlled.
Compared with the prior wind tunnel temperature control system technology, the invention has the beneficial effects that:
(1) the three-way mixed flow valve adopted by the invention can realize the stability of the circulating flow at two sides of the valve by adjusting the temperature, only changes the mixing proportion by utilizing the temperature feedback, has unique variable and is simple to adjust;
(2) the three-way mixed flow valve can realize quick action of the valve by using pneumatic as an action mode, and the valve is high in regulation speed;
(3) the main and auxiliary three-way mixed flow valves can be applied to the regulation test with larger load span;
(4) the invention adopts the mode of coexisting the cooling water and the secondary refrigerant system in series-parallel connection to expand the functional application of the cooling water, so that the cooling water is not only used for cooling process equipment, but also used as one of cold sources of an environmental wind tunnel temperature control system, and the system is more energy-saving in operation;
(5) the cooling water hot water tank and the cooling water tank adopted by the invention have two functions, namely, cold energy accumulation, reduction of the power requirement of the cooling water tower and reduction of the impact of thermal load change on a cooling water system, and a buffering effect is achieved;
(6) the invention can realize the stable work under high temperature working condition by using the hot water boiler as a heat source and transferring heat to the secondary refrigerant through hot water and then adjusting the temperature, and avoids the problem of local overheating caused by directly heating the secondary refrigerant by the pipeline-like electric heater.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The environment wind tunnel temperature control system mainly comprises an environment wind tunnel 1, a wind tunnel heat exchanger 2, a secondary refrigerant main drive pump 3, a secondary refrigerant cold branch main temperature control valve 4, a secondary refrigerant cold branch auxiliary temperature control valve 5, a constant pressure expansion tank 6, a buffer tank 7, a secondary refrigerant low-temperature drive pump 8, a secondary refrigerant normal-temperature drive pump 9, a secondary refrigerant hot branch temperature control valve 10, a secondary refrigerant hot branch drive pump 11, a secondary refrigerant heating heat exchanger 12, a hot water drive pump 13, a hot water boiler 14, a low-temperature refrigeration system 15, a secondary refrigerant cooling heat exchanger 16, a pipeline 17, a cooling water secondary refrigerant drive pump 18, a cooling water low-temperature refrigeration system drive pump 19, a cooling water secondary refrigerant temperature control valve 20, a cooling water low-temperature refrigeration system temperature control valve 21, a cooling water hot water tank 22, a cooling water cooling tank 23, a cooling water tower 24, a cooling water return pump 25, a temperature sensor 26 and the like. Wherein the wind tunnel heat exchanger 2 is positioned at the diffusion section in the cavity of the environmental wind tunnel 1. The cold-carrying medium main driving pump 3, the cold-carrying medium main temperature control valve 4, the cold-carrying medium auxiliary temperature control valve 5, the constant-pressure expansion tank 6, the buffer tank 7, the cold-carrying medium low-temperature driving pump 8, the cold-carrying medium normal-temperature driving pump 9, the cold-carrying medium hot-carrying temperature control valve 10 and the cold-carrying medium hot-carrying driving pump 11 are connected to the wind tunnel heat exchanger 2, the cold end of the cold-carrying medium heating heat exchanger 12, the cold end of the cold-carrying medium cooling heat exchanger 16 and the low-temperature refrigerating system 15 through pipelines 17 to form a circulating loop, and the loop is called as a cold-carrying medium system. The hot water driving pump 13 and the hot water boiler 14 are connected with the hot end of the coolant heating heat exchanger 12 through a pipeline 17 to form a circulating loop, and the loop is called a hot water system. The cooling water secondary refrigerant drive pump 18, the cooling water low-temperature refrigeration system drive pump 19, the cooling water secondary refrigerant temperature control valve 20 and the cooling water low-temperature refrigeration system temperature control valve 21 form a circulation loop with the cooling water hot water tank 22 and the cooling water cooling tank 23 through the pipeline 17, the cooling water tower 24 and the cooling water tower return pump 25 form a circulation loop with the cooling water hot water tank 22 and the cooling water cooling tank 23 through the pipeline 17, and the two loops are collectively called as a cooling water system. Temperature sensors 26 are arranged in the front end airflow of the wind tunnel heat exchanger 2 in the environmental wind tunnel 1 body and on the pipeline 17 behind the cooling water secondary refrigerant drive pump 18 and the cooling water low-temperature refrigeration system drive pump 19. The cooling water system is used for cooling high-temperature tests of environmental wind tunnels, cooling environmental wind tunnel process equipment and the like; the secondary refrigerant system is used for controlling and managing heat exchange media (secondary refrigerant) of the environmental wind tunnel, and the hot water system is used for providing high-temperature environmental conditions for the environmental wind tunnel. The temperature control system principle is shown in fig. 1.
The temperature control system carries out heat transfer through the dividing wall type heat exchanger by each subsystem, a flowing medium in the cooling water system is cooling water, and the cooling water system has the main functions of taking away heat of secondary refrigerant absorbed by a refrigerant of the low-temperature refrigeration system from a heat exchanger (an evaporator of the low-temperature refrigeration system) of the low-temperature refrigeration system 15 and cooling the secondary refrigerant by directly absorbing the heat of the secondary refrigerant through a secondary refrigerant cooling heat exchanger 16.
The flowing medium in the secondary refrigerant system is secondary refrigerant, the secondary refrigerant system has the functions of transferring the gas heat of the environmental wind tunnel 1 to a low-temperature refrigeration system or a cooling water system in the temperature control system, and transferring the heat to the wind tunnel heat exchanger 2 through a heater in the secondary refrigerant system, so as to adjust the temperature of the gas in the environmental wind tunnel 1.
The flow medium in the hot water system is hot water, and the function of the hot water system is to transfer the heat energy in the hot water boiler 14 to the coolant system.
The design of the temperature control system fully considers energy conservation and environmental protection, the flow of the temperature control system is reasonably designed according to different test working condition loads, meanwhile, advanced mixed flow control equipment-pneumatic three-way mixed flow valves (a secondary refrigerant cold branch main temperature control valve 4, a secondary refrigerant cold branch auxiliary temperature control valve 5, a secondary refrigerant hot branch temperature control valve 10, a cooling water secondary refrigerant temperature control valve 20 and a cooling water low-temperature refrigeration system temperature control valve 21) are adopted in the system design, the device is a three-way multifunctional mixed flow valve which can adjust the mixing proportion and the flow of cold and hot fluids and can be cut off, the valve achieves an excellent mode of any flow and proportion by utilizing the change of the cross-flow hole sectional area formed by the movement of a valve core in the valve, namely, the flow proportion of different channels of the valve is changed while the temperature is adjusted, the total flow circulating at two sides of the valve is not changed, so that the only variable adjustment is achieved, and the pneumatic action mechanism reacts rapidly, in conclusion, the valve has high precision and high efficiency. Meanwhile, the valve can also be used as a common stop valve to meet the switching between a refrigeration mode and a heating mode.
The cooling water system and the low-temperature refrigeration system are interconnected and connected in parallel to the secondary refrigerant system, mixed flow valves (a cooling water secondary refrigerant temperature control valve 20 and a cooling water low-temperature refrigeration system temperature control valve 21) are respectively arranged at the joints of the cooling water system, the low-temperature refrigeration system and the secondary refrigerant system, the backflow direction of the cooling water low-temperature refrigeration system temperature control valve 21 is closed under the low-temperature working condition, the secondary refrigerant system is communicated with the low-temperature refrigeration system 15 through the cooling water low-temperature refrigeration system temperature control valve 21 for heat exchange, the cooling water secondary refrigerant temperature control valve 20 is communicated with the cooling water system for heat exchange under the normal-temperature working condition, and the secondary refrigerant heat branch temperature control valve 10 in the secondary refrigerant system is communicated with the secondary refrigerant system for heat exchange under the high-temperature working condition.
The design of the temperature control system is based on the consideration of energy conservation and environmental protection, and the temperature control system operates in three modes, namely a low-temperature operation mode (less than or equal to 35 ℃), a normal-temperature operation mode (35-50 ℃) and a high-temperature operation mode (more than or equal to 50 ℃) according to the operation conditions of the environmental wind tunnel 1. Because the temperature difference of the cold and heat requirements of the cooling working condition is large, and the situation of large heat load fluctuation possibly exists, the constant-pressure expansion tank 6 is arranged in the temperature control system and used for stabilizing the pressure stability of the secondary refrigerant, and the buffer tank 7 is also arranged and used for eliminating the impact influence of large load fluctuation on load shock of the low-temperature refrigeration system 15 and the secondary refrigerant cooling heat exchanger 16. In order to adapt to the situation of large test load difference, two sets of temperature control valves (a secondary refrigerant cold branch main temperature control valve 4 and a secondary refrigerant cold branch temperature control valve 5) for refrigeration working conditions are specially designed to adapt to the large-span heat load temperature control test. The principle of the different operating modes is as follows:
and (3) low-temperature operation mode:
starting a secondary refrigerant main driving pump 3, a secondary refrigerant low-temperature driving pump 8, a cooling water low-temperature refrigerating system driving pump 19, a cooling water tower return pump 25, a spraying and fan of a cooling water tower 24, a hot water driving pump 13, a hot water boiler 14 and a secondary refrigerant heat branch driving pump 11, wherein a secondary refrigerant system circulating loop starts to operate, a cooling water system and a hot water system also start to operate, a low-temperature refrigerating system 15 is started, high-temperature gas in an environmental wind tunnel 1 transfers heat to secondary refrigerant in the wind tunnel heat exchanger 2 after passing through the wind tunnel heat exchanger 2, the heated secondary refrigerant transfers heat to a secondary refrigerant main temperature control valve 4 branch along a pipeline 17 and enters an evaporator of the low-temperature refrigerating system 15 through a buffer tank 7, a refrigerant loop in the low-temperature refrigerating system 15 transfers heat from the evaporator of the low-temperature refrigerating system 15 to a condenser of the low-temperature refrigerating system 15, and cooling water in the condenser of the low-temperature refrigerating system 15 flows into a cooling water hot water tank 22 through a cooling water circulating loop, the heated cooling water is returned to the cooling tower 24 by a cooling tower return pump 25 and dissipates heat through the cooling tower to the elements. The change of the heat load in the environment wind tunnel 1 is reflected to a temperature sensor 26 at the front end of the wind tunnel heat exchanger in real time, a temperature feedback signal is transmitted to a secondary refrigerant cold branch main temperature control valve 4, the valve adjusts the flow reflux proportion of secondary refrigerant flowing in the wind tunnel heat exchanger 2 in real time, if the heat load in the environment wind tunnel 1 is large, the secondary refrigerant cold branch main temperature control valve 4 is adjusted to increase the flow reflux proportion of the secondary refrigerant flowing in the wind tunnel heat exchanger 2, most of the secondary refrigerant flowing in the wind tunnel heat exchanger 2 flows through a low-temperature refrigerating system 15 to obtain large energy, most of heated cooling water in a condenser of the low-temperature refrigerating system 15 flows into a cooling water hot water tank 22 through the adjustment of a cooling water low-temperature refrigerating system temperature control valve 21, and then returns to a cooling water tower 24 through a cooling water tower return pump 25 and disperses the heat to the natural environment through the cooling water tower. If the heat load in the environment wind tunnel 1 is small, the secondary refrigerant cold branch main temperature control valve 4 is adjusted to reduce the flow reflux proportion of the secondary refrigerant flowing in the wind tunnel heat exchanger 2, most of the secondary refrigerant flowing in the wind tunnel heat exchanger 2 flows through the secondary refrigerant cold branch main temperature control valve 4 and then returns to the secondary wind tunnel heat exchanger 2, only a small part of the secondary refrigerant flowing in the wind tunnel heat exchanger 2 flows through the low-temperature refrigeration system 15 to obtain small energy, namely, the heat balance of the environment wind tunnel 1 can be met, most of the heated cooling water in the low-temperature refrigeration system 15 is adjusted by the low-temperature refrigeration system temperature control valve 21 and returns to the low-temperature refrigeration system 15 condenser, only a small part of the heated cooling water flows into the cooling water hot water tank 22 and then returns to the cooling water tower 24 through the cooling water tower 25, and the heat is dissipated to the natural environment through the cooling water tower. When the temperature overshoots or the load of the environmental wind tunnel 1 suddenly drops, the secondary refrigerant heat branch temperature control valve 10 is adjusted to transfer heat from the hot water heating system to the secondary refrigerant system, so that the air temperature in the environmental wind tunnel 1 is stable.
Normal temperature operation mode:
the cooling water system transmits the cold energy at normal temperature to the secondary refrigerant of the secondary refrigerant system, and the secondary refrigerant system transmits the cold energy at normal temperature to the air in the environmental wind tunnel 1 through the secondary refrigerant, so that the temperature control of the environmental wind tunnel 1 is realized. In the operation mode, the low-temperature refrigeration system 15 does not need to be started, and the normal-temperature control in the environmental wind tunnel 1 is realized by utilizing the outdoor natural environment condition.
The primary secondary refrigerant drive pump 3, the secondary refrigerant normal temperature drive pump 9, the cooling water secondary refrigerant temperature control valve 20, the cooling water tower return water pump 25 and the spraying and fan of the cooling water tower 24 are started, the hot water drive pump 13, the hot water boiler 14, the secondary refrigerant heat branch drive pump 11 and the secondary refrigerant system circulation loop start to operate, the cooling water system and the hot water system also start to operate, high-temperature gas in the environmental wind tunnel 1 transfers heat to secondary refrigerant in the wind tunnel heat exchanger 2 after passing through the wind tunnel heat exchanger 2, the heated secondary refrigerant transfers heat to a branch of the secondary refrigerant cold branch primary temperature control valve 4 along a pipeline 17, and enters the secondary refrigerant cooling heat exchanger 16 through the buffer tank 7, the heat is transferred to the cooling water of the secondary refrigerant cooling heat exchanger 16 through the secondary refrigerant cooling heat exchanger 16, the cooling water flows into the cooling water hot water tank 22 through the cooling water circulation loop, and the heated cooling water returns to the cooling water tower 24 through the cooling water tower return pump 25 and dissipates the heat to the natural environment through the cooling water tower. The change of the heat load in the environment wind tunnel 1 is reflected to a temperature sensor 26 at the front end of the wind tunnel heat exchanger in real time, a temperature feedback signal is transmitted to the secondary refrigerant cold branch main temperature control valve 4, the valve adjusts the flow reflux proportion of the secondary refrigerant flowing in the wind tunnel heat exchanger 2 in real time, if the heat load in the environment wind tunnel 1 is large, the secondary refrigerant cold branch main temperature control valve 4 is adjusted to increase the flow reflux proportion of the secondary refrigerant flowing in the wind tunnel heat exchanger 2, most of the secondary refrigerant flowing in the wind tunnel heat exchanger 2 flows through the secondary refrigerant cooling heat exchanger 16 to obtain large energy, most of the heated cooling water in the secondary refrigerant cooling heat exchanger 16 flows into a cooling water hot water tank 22 through the adjustment of a cooling water secondary refrigerant temperature control valve 20, and then returns to a cooling water tower 24 through a cooling water tower return pump 25, and the heat is dissipated to the nature environment through the cooling water tower. If the heat load in the environment wind tunnel 1 is small, the secondary refrigerant cold branch main temperature control valve 4 is adjusted to reduce the flow reflux proportion of the secondary refrigerant flowing in the wind tunnel heat exchanger 2, most of the secondary refrigerant flowing in the wind tunnel heat exchanger 2 flows through the secondary refrigerant cold branch main temperature control valve 4 and then returns to the secondary wind tunnel heat exchanger 2, only a small part of the secondary refrigerant flowing in the wind tunnel heat exchanger 2 flows through the secondary refrigerant cooling heat exchanger 16 to obtain small energy, namely, the heat balance of the environment wind tunnel 1 can be met, most of the heated cooling water in the secondary refrigerant cooling heat exchanger 16 returns to the secondary refrigerant cooling heat exchanger 16 through the adjustment of the cooling water secondary refrigerant temperature control valve 20, only a small part of the heated cooling water flows into the cooling water tank 22, and then returns to the cooling water tower 24 through the cooling water tower 25, and dissipates the heat to the natural environment through the cooling water tower. When the temperature overshoots or the load of the environmental wind tunnel 1 suddenly drops, the secondary refrigerant heat branch temperature control valve 10 is adjusted to transfer heat from the hot water heating system to the secondary refrigerant system, so that the air temperature in the environmental wind tunnel 1 is stable.
And (3) high-temperature operation mode:
the secondary refrigerant system heats the secondary refrigerant through the secondary refrigerant heating heat exchanger 12 on the pipeline of the secondary refrigerant system, and then the heat is transferred to the air in the environmental wind tunnel 1 through the secondary refrigerant, so that the temperature control of the environmental wind tunnel 1 is realized. In the operation mode, only the secondary refrigerant system is used for heating the internal circulation, so that the flow range of the secondary refrigerant is reduced to the maximum extent, the heat loss is reduced, and the energy-saving operation is realized.
And starting the primary secondary refrigerant drive pump 3, the hot water drive pump 13, the hot water boiler 14, the secondary refrigerant heat branch drive pump 11, the secondary refrigerant normal-temperature drive pump 9, the cooling water secondary refrigerant temperature control valve 20, the cooling water tower return water pump 25 and the spraying and fan of the cooling water tower 24, wherein the circulation loop of the secondary refrigerant system starts to operate, the cooling water system also starts to operate, and the hot water system also starts to operate. The cold energy of the low-temperature gas in the environment wind tunnel 1 is transmitted to the secondary refrigerant in the wind tunnel heat exchanger 2 after passing through the wind tunnel heat exchanger 2, the cooled secondary refrigerant transmits the cold energy to the secondary refrigerant heating heat exchanger 12 along the pipeline 17, the cold energy is transmitted to the hot water in the secondary refrigerant heating heat exchanger 12 through the secondary refrigerant heating heat exchanger 12, the hot water flows into the hot water boiler 14 through a hot water circulation loop, and the cooled hot water is heated again through the hot water boiler and enters the hot water circulation again for heat exchange. Similarly, the change of the cold load in the environment wind tunnel 1 is reflected to the temperature sensor 26 at the front end of the wind tunnel heat exchanger in real time, a temperature feedback signal is transmitted to the secondary refrigerant heat branch temperature control valve 10, the flow reflux proportion of the secondary refrigerant flowing from the wind tunnel heat exchanger 2 is adjusted in real time by the valve, if the cold load in the environment wind tunnel 1 is large, the secondary refrigerant heat branch temperature control valve 10 is adjusted to increase the flow reflux proportion of the secondary refrigerant flowing from the wind tunnel heat exchanger 2, most of the secondary refrigerant flowing from the wind tunnel heat exchanger 2 flows through the secondary refrigerant heating heat exchanger 12 to obtain large energy, and cooled hot water in the secondary refrigerant heating heat exchanger 12 flows into the hot water boiler 14 through the hot water drive pump 13 and then enters the hot water circulation again for heat exchange after being heated by the hot water boiler 14. If the cold load in the environment wind tunnel 1 is small, the secondary refrigerant heat branch temperature control valve 10 is adjusted to reduce the flow reflux proportion of the secondary refrigerant flowing from the wind tunnel heat exchanger 2, only a small part of the secondary refrigerant flowing from the wind tunnel heat exchanger 2 flows through the secondary refrigerant heating heat exchanger 12 to obtain small energy, cooled hot water in the secondary refrigerant heating heat exchanger 12 flows into the hot water boiler 14 through the hot water drive pump 13, and the hot water is heated through the hot water boiler 14 and then enters the hot water circulation again for heat exchange.
When the temperature overshoots or the load of the environmental wind tunnel 1 suddenly drops, the cold quantity of the secondary refrigerant cold branch main temperature control valve 4 is adjusted to be transferred to the wind tunnel heat exchanger 2 from the end of the secondary refrigerant system buffer tank, so that the temperature of the air in the environmental wind tunnel 1 is stable.
Claims (9)
1. An environment wind tunnel temperature control system is characterized in that: the wind tunnel heat exchanger is arranged at an expansion section of a wind tunnel and used for integrally adjusting the temperature of fluid in the wind tunnel, the main pipe loop is a pipeline communicated with an inlet and an outlet of the wind tunnel heat exchanger, the heat exchange branches are connected in parallel on the main pipe loop and can independently circulate by means of the main pipe loop respectively so as to refrigerate or heat fluid in the wind tunnel through the wind tunnel heat exchanger respectively, each heat exchange branch comprises a secondary refrigerant circulating unit and a heat exchange circulating unit, each heat exchange circulating unit comprises a secondary refrigerant cooling heat exchanger, a normal temperature control valve, a normal temperature driving pump, a normal temperature cold water pipeline, a normal temperature hot water pipeline and a water supply unit, each secondary refrigerant circulating unit comprises a flow removal pipeline, a return pipeline, a driving pump, a three-way valve and an adjusting branch circuit, the flow-removing pipeline is communicated with the main pipe loop and the heat exchange circulating unit, the three-way valve and the driving pump are sequentially installed on the flow-removing pipeline along the flow direction, the return pipeline is located at the downstream of the flow-removing pipeline and is communicated with the main pipe loop and the heat exchange circulating unit, therefore, secondary refrigerant flowing out of the outlet of the wind tunnel heat exchanger can flow into the heat exchange circulating unit through the main pipe loop and the flow-removing pipeline by means of the three-way valve, heat exchange is carried out, then the secondary refrigerant flows into the wind tunnel heat exchanger through the return pipeline and the main pipe loop, and the adjusting branch is communicated with the flow-removing pipeline and the return pipeline by means of the three-way valve.
2. The ambient wind tunnel temperature control system of claim 1, wherein: the heat exchange branch comprises a heating circulation branch, a heat exchange circulation unit of the heating circulation branch comprises a secondary refrigerant heating heat exchanger, a cold water pipeline, a hot water boiler, a hot water pipeline and a hot water drive pump, the flow-going pipeline and the return pipeline are respectively communicated with an inlet and an outlet of the secondary refrigerant unit in the secondary refrigerant heating heat exchanger, the cold water pipeline and the hot water pipeline are respectively communicated with the heating unit of the secondary refrigerant heating heat exchanger and the hot water boiler, and the hot water drive pump is installed on the hot water pipeline.
3. The ambient wind tunnel temperature control system of claim 2, wherein: the heat exchange branch road still includes the refrigeration cycle branch road, the refrigeration cycle branch road includes normal atmospheric temperature refrigeration cycle branch road and low temperature refrigeration cycle branch road, the two secondary refrigerant circulation unit shares one section respectively and goes to flow pipeline and one section return line, is sharing go to flow pipeline and go to install three-way valve, level pressure expansion tank and buffer tank in proper order along the flow direction, the pipeline that goes of buffer tank low reaches divides the normal atmospheric temperature to go to flow to divide and divide with the low temperature to go to flow to divide and divide, installs the driving pump respectively on these two branches and communicate with respective heat exchange cycle unit respectively, return line also divides the normal atmospheric temperature to flow to divide and divide with the low temperature backward flow divide and communicate with respective heat exchange cycle unit respectively.
4. The ambient wind tunnel temperature control system of claim 3, wherein: the normal-temperature flow-removing shunt and the normal-temperature return shunt are respectively communicated with an inlet and an outlet of a secondary refrigerant unit in the secondary refrigerant cooling heat exchanger, the water supply unit comprises a cooling water hot water tank, a cooling water tank, a cooling water tower and a cooling water tower water return pump, the cooling water hot water tank and the cooling water tank are respectively communicated with the cooling water tower through pipelines, the cooling water tower water return pump is installed on a pipeline communicated with the cooling water hot water tank and the cooling water tower, a normal-temperature cold water pipeline is communicated with the secondary refrigerant cooling heat exchanger and the cooling water tank, a normal-temperature hot water pipeline is communicated with the secondary refrigerant cooling heat exchanger and the cooling water hot water tank, a normal-temperature control valve is installed on the normal-temperature hot water pipeline, and a normal-temperature drive pump is installed on the normal-temperature cold water pipeline.
5. The ambient wind tunnel temperature control system of claim 4, wherein: the heat exchange circulation unit of the low-temperature refrigeration circulation branch comprises a low-temperature refrigeration system, a low-temperature control valve, a low-temperature drive pump, a low-temperature cold water pipeline, a low-temperature hot water pipeline and a water supply unit, wherein the low-temperature outgoing branch and the low-temperature return branch are respectively communicated with an inlet and an outlet of a secondary refrigerant unit in the low-temperature refrigeration system, the low-temperature cold water pipeline is communicated with the low-temperature refrigeration system and a cooling water tank, the low-temperature hot water pipeline is communicated with the low-temperature refrigeration system and the cooling water heating water tank, the low-temperature control valve is installed on the low-temperature hot water pipeline, and the low-temperature drive pump is installed on the low-temperature cold water pipeline.
6. The ambient wind tunnel temperature control system according to any one of claims 3 to 5, wherein: the device also comprises an adjusting branch which is communicated with the flow-removing pipeline in front of and behind the three-way valve by utilizing a pipeline, and the pipeline is provided with a three-way valve for adjustment.
7. The ambient wind tunnel temperature control system according to any one of claims 3 to 5, wherein: the temperature adjusting step range of the normal-temperature refrigeration circulation branch is 35-50 ℃, and the temperature adjusting step range of the low-temperature refrigeration circulation branch is not more than 35 ℃.
8. The ambient wind tunnel temperature control system according to any one of claims 3 to 5, wherein: the temperature regulation range of the heating circulation branch is more than or equal to 50 ℃.
9. The ambient wind tunnel temperature control system of claim 1, wherein: temperature sensors are respectively arranged at the position, located at the upstream of the wind tunnel heat exchanger, of the wind tunnel, on the normal-temperature hot water pipeline and the low-temperature hot water pipeline, the three-way valve, the normal-temperature control valve and the low-temperature control valve can be respectively controlled and adjusted according to data measured by the temperature sensors, and therefore the temperature in the wind tunnel can be accurately controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811333723.8A CN109582057B (en) | 2018-11-09 | 2018-11-09 | Environmental wind tunnel temperature control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811333723.8A CN109582057B (en) | 2018-11-09 | 2018-11-09 | Environmental wind tunnel temperature control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109582057A CN109582057A (en) | 2019-04-05 |
| CN109582057B true CN109582057B (en) | 2021-10-01 |
Family
ID=65922000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811333723.8A Active CN109582057B (en) | 2018-11-09 | 2018-11-09 | Environmental wind tunnel temperature control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109582057B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110440505A (en) * | 2019-06-27 | 2019-11-12 | 合肥通用机械研究院有限公司 | A kind of wind-tunnel temperature control system of Two-way Cycle refrigerating medium Collaborative Control |
| CN110907121A (en) * | 2019-11-14 | 2020-03-24 | 江苏永昇空调有限公司 | Wind tunnel heat exchange system |
| CN112729747B (en) * | 2020-12-30 | 2023-04-14 | 中国航天空气动力技术研究院 | Automobile environment wind tunnel process equipment control system |
| CN112729755B (en) * | 2021-01-29 | 2021-08-24 | 北京朗信智能科技有限公司 | System and method for regulating and controlling temperature of environmental wind tunnel test cabin |
| CN113029610B (en) * | 2021-04-14 | 2022-05-27 | 中南大学 | Snow accumulation and icing wind tunnel test system and test method for railway train bogie |
| CN114112282B (en) * | 2021-11-22 | 2024-04-26 | 哈尔滨工业大学 | Large-scale low-temperature controllable atmospheric boundary layer test system and method for wind and snow simulation |
| CN114489174B (en) * | 2021-12-28 | 2023-03-07 | 中国航天空气动力技术研究院 | Automobile environment wind tunnel temperature control system based on chain type automatic control strategy |
| CN114281133B (en) * | 2021-12-30 | 2022-06-24 | 中国汽车工程研究院股份有限公司 | Control method for rapid temperature change of automobile environment wind tunnel |
| CN114296490B (en) * | 2021-12-30 | 2022-07-29 | 中国汽车工程研究院股份有限公司 | Feedforward control method for temperature of automobile environment wind tunnel |
| CN114486265B (en) * | 2022-04-01 | 2022-06-24 | 中国飞机强度研究所 | Cold carrying system for aircraft extreme temperature test and parameter design method thereof |
| CN114623649A (en) * | 2022-05-17 | 2022-06-14 | 中国空气动力研究与发展中心高速空气动力研究所 | Continuous wind tunnel airflow temperature cooling system |
| CN114858403B (en) * | 2022-05-17 | 2023-03-10 | 中国空气动力研究与发展中心高速空气动力研究所 | Continuous wind tunnel airflow temperature cooling method |
| CN116718065B (en) * | 2023-08-09 | 2023-10-20 | 中国空气动力研究与发展中心高速空气动力研究所 | Water-cooling pipeline installation method for controlling air temperature uniformity of large continuous wind tunnel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129259A (en) * | 2010-01-20 | 2011-07-20 | 北京航空航天大学 | Neural network proportion integration (PI)-based intelligent temperature control system and method for sand dust environment test wind tunnel |
| CN103018047A (en) * | 2012-12-03 | 2013-04-03 | 潍柴动力股份有限公司 | Engine rig test device and engine water temperature control device |
| CN205317441U (en) * | 2015-12-17 | 2016-06-15 | 上海德朗汽车零部件制造有限公司 | A supplementary cryogenic cooling water system for auto radiator wind tunnel test platform |
| CN206618061U (en) * | 2017-02-24 | 2017-11-07 | 上海佐竹冷热控制技术有限公司 | Automobile wind tunnel test room air-conditioning system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120048953A1 (en) * | 2009-07-15 | 2012-03-01 | Beihang University | Temperature adjusting device and an intelligent temperature control method for a sand and dust environment testing system |
-
2018
- 2018-11-09 CN CN201811333723.8A patent/CN109582057B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102129259A (en) * | 2010-01-20 | 2011-07-20 | 北京航空航天大学 | Neural network proportion integration (PI)-based intelligent temperature control system and method for sand dust environment test wind tunnel |
| CN103018047A (en) * | 2012-12-03 | 2013-04-03 | 潍柴动力股份有限公司 | Engine rig test device and engine water temperature control device |
| CN205317441U (en) * | 2015-12-17 | 2016-06-15 | 上海德朗汽车零部件制造有限公司 | A supplementary cryogenic cooling water system for auto radiator wind tunnel test platform |
| CN206618061U (en) * | 2017-02-24 | 2017-11-07 | 上海佐竹冷热控制技术有限公司 | Automobile wind tunnel test room air-conditioning system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109582057A (en) | 2019-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109582057B (en) | Environmental wind tunnel temperature control system | |
| CN110588278B (en) | Distributed driving electric automobile heat management system for optimizing heat energy distribution | |
| US20120125022A1 (en) | Cooling system | |
| CN112498046B (en) | Thermal management system | |
| CN107639992B (en) | Thermal management system | |
| CN102425882A (en) | Heat recovery multiple heat pump air-conditioning hot water machine and floor heating system | |
| CN106989545A (en) | Refrigerant cooling device and air conditioner | |
| CN110440505A (en) | A kind of wind-tunnel temperature control system of Two-way Cycle refrigerating medium Collaborative Control | |
| CN101029757B (en) | Cooling unit | |
| CN114683803B (en) | Heat pump-based heat management system for pure electric vehicle and control method thereof | |
| CN101162114B (en) | Heat pump installation | |
| CN101290148A (en) | Water energy-saving system for air quantity variable air conditioner | |
| CN100578113C (en) | A kind of half cascade type heat pump cold and heat supply method and air-conditioning system | |
| CN109100164A (en) | thermal simulation system and heating component testing method | |
| CN112326535A (en) | Low-temperature test system for hydraulic filter and detection method thereof | |
| CN111251814A (en) | Thermal management system of vehicle and vehicle | |
| CN105398308B (en) | Air conditioning system of electric automobile | |
| CN104362835A (en) | Thermal management system for motor car traction converter | |
| CN111422026A (en) | Increase form electric motor car cooling system waterway structure | |
| CN207842707U (en) | A kind of power battery cooling heating management system and power battery | |
| CN115871413A (en) | Whole vehicle thermal management system of electric commercial vehicle and pure electric vehicle | |
| CN201583048U (en) | Heat pump water heater | |
| CN101290149A (en) | Fresh air energy-saving system for air conditioner | |
| CN110884316A (en) | Vehicle thermal management system | |
| CN205860275U (en) | Magnetic suspension VRF Air Conditioning System |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |