CN101672811B - Ground simulation vapour condensation test device in the state of air movement load and method - Google Patents
Ground simulation vapour condensation test device in the state of air movement load and method Download PDFInfo
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- CN101672811B CN101672811B CN2009101848093A CN200910184809A CN101672811B CN 101672811 B CN101672811 B CN 101672811B CN 2009101848093 A CN2009101848093 A CN 2009101848093A CN 200910184809 A CN200910184809 A CN 200910184809A CN 101672811 B CN101672811 B CN 101672811B
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Abstract
The invention provides a vapour condensation test method and a device by using a rotary stage to simulate the state of air movement load, belonging to the technical field of two-phase flow test. The movement load is obtained by stimulation of a ground rotary stage, and air dynamic load with different magnitudes can be obtained by regulating the rotary speed of the stage. The method mainly comprises the following four parts: a rotary table, a steam circuit, a coolant circuit, and experiment test and data acquisition storage equipment. The method and the device can simulate and research vapour condensation on air movement load in ground condition.
Description
Technical field
Steam condensation proving installation and method under the ground simulation aerial sports load; Belong to two-phase flow experiment measuring technical field, relate to the new technology of aerial sports load ground simulation platform, steam generation and condensation method, the shooting of steam condensation process and fluid parameter measuring method.
Background technology
Aeronautical and space technology is the important symbol of a national state-of-art.In the aerospace field; The installation of high-power high integrated electronic electrical equipment; Though improved the overall performance and the fight capability of aircraft, brought tens kilowatts heating load, its thermal value is original tens times; The cause air circulation system is difficult to reach the cooling requirement of its equipment, needs better energy management and refrigeration system.The two-phase flow medium utilizes the latent heat transmission can satisfy this requirement in the sweat cooling circulation.The idea with liquid cooling and evaporation circulating cooling system is just fermented by west advanced country as far back as the seventies and eighties of eighties of last century.The high maneuverability of operational aircraft makes the ducted two-phase flow flowing law of evaporation circulating system, heat transfer characteristic and mass-transfer performance than the ground fixed equipment, and very big variation has all taken place.It is the same to have obvious characteristic as two-phase flow under the microgravity, the boiling of the biphase gas and liquid flow under the dynamic load effect and condense its special performance is arranged.The condensation heat transfer influence factor is more; Heat transfer mechanism is complicated; The influence of being transshipped acting force; Significant change will take place in surface tension and interfacial shear stress, and mobile variation characteristic such as the annular flow in its two-phase flow condensation process, gap stream, wave flow, slug flow, layering plunger, dropwise condensation and flow resistance characteristic thereof will highlight.The variation that pearl is confluxed and beats taking place is peeled off, coagulated to flow pattern, flow stability, liquid film.It is flowed the result and Heat and Mass Transfer Characteristics more becomes complicated.The instability that flows and conduct heat is burnt, is shaken evaporator and condenser, and adverse effects such as compressor vibrations, liquid hammer play the effect of adding fuel to the flames.The complicacy of two-phase flow has become its equipment development bottleneck under the dynamic load effect, and then has influence on its application on aeronautical and space technology.Because its complicacy, the vaporization cycle environmental control system comes the end of five kinds of environmental control systems.But big refrigerating capacity that it is difficult to substitute and low energy consumption are extremely tempting again.Through effort for many years, the sweat cooling system has been applied on several kinds of limited operational aircrafts such as F-15A, F-22, Grumman E-2C.Airborne evaporation circulating cooling subsystem is still the emphasis of west advanced country aircraft environment control system research at present.Because secret cause is difficult to obtain the concrete data of this decorum.The development of China's high-performance fighter aircraft and large transport airplane presses for to air environment provides a suitable working environment, improves its reliability and serviceable life.The research and development of airborne evaporation circulating system, imperative.
In the acceleration and maneuvering flight of aircraft, overload can reach 9 G or higher.These dynamic loadings must act on each system, each parts, each member in the aircraft.Compressor, evaporator, the condenser effect that do not make an exception and will be transshipped one by one of airborne evaporation circulating system and critical piece thereof.The evaporation of cold-producing medium, condense and flow and diabatic process all can receive the influence of dynamic load effect, and then influence the performance of parts and system.So the reliability of the design and running of the sweat cooling circulation system is with fully realizing of the condensation mechanism that depends on cold-producing medium under the dynamic load effect to a great extent.Therefore, the condensation of steam research just seems particularly important under the dynamic load effect.
Present stage series of vapor condensation experiments research rests on the ground stationary state mostly, produces the requirement of dynamic load state when the experimental result that obtains like this can not satisfy aircraft maneuver.The appearance of dynamic load; Make ground a lot of achievement in research might not still set up aboard; The defective of the experimental technique of sleep mode is to realize that dynamic load is for steam condensation Effect on Performance; Therefore we will obtain still suitable aboard experimental result, and experimental situation must have the dynamic load effect.For the steam condensation research aspect under the effect of flight dynamic load, rarely seen relevant research report.This mainly is because the realization of flight dynamic load state has certain difficulty.
In order to realize the dynamic load state, many now experiments that comprise the flight load state often need all be installed to equipment set and surveying instrument and follow the machine experiment on the aircraft.Because being the centripetal force that is produced of turning when being flown by the aircraft high-speed maneuver, causes flight load; So during the experiment under carrying out the flight load state, the overload that aircraft has only dangerous plays such as doing acceleration, deceleration, tempo turn, roll, quick pull-out for a long time just can obtain to continue.The security that experimentizes in this case is poor, aircraft accident takes place easily and damage experimental facilities.Aircraft could go up to the sky to fly when occurring owing to the weather that has only suitable flying condition in addition, causes following the machine experiment to receive the influence of weather bigger; Be exactly many more with the machine experiment number in addition, the flight number of times is also just many more, and experimental cost will be corresponding very high.
Though having had now into imagination utilizes long straight rail to quicken with simulated flight dynamic load state on ground; Can follow the machine experiment; But because this method need go up the long acceleration orbit of km; Taken very big lab space, implemented very and be not easy, and the size of dynamic load also is difficult to carry out real-time regulated according to experimental requirements.The ground simulation method of two-phase flow is not also realized under the dynamic load effect, and the method that can under moving load condition, carry out two-phase flow data acquisition and detection in real time effectively is still in exploration.
Application number is that 200810018737.0 application for a patent for invention discloses two phase flow ground simulation test method and device under a kind of flight load function; This method utilization flight dynamic load analog platform simulated aircraft dynamic load state; Rotational speed through the adjustment rotating disk obtains different centripetal accelerations, with the simulated flight loaded-up condition.This device is made up of flight dynamic load analog platform and two-phase flow test macro.Wherein the two-phase flow test macro is made up of the circulating water circulation system, fluid parameter measuring system and data acquisition saved system.This device can be realized this method and install and only can realize the boiled water two-phase flow, or the experimental study of the boiled water three-phase of doping air stream, but can not realize series of vapor condensation experiments research.And series of vapor condensation experiments research can obtain annular flow, gap stream, wave flow, layering plunger, dropwise condensation, alternate characteristic and the flow resistance characteristic of mixing in the interior biphase gas and liquid flow condensation process of pipe under the motion dynamic load; Obtain the drop that forms, increases, changes and condense of liquid film in the motion dynamic load current downflow condensation process and form, coagulate the conflux characteristics of motion of variation of pearl; Obtain the Heat and Mass Transfer Characteristics of two-phase flow under the motion dynamic load.
Summary of the invention
The object of the present invention is to provide a kind of foundation also on the ground can realize steam condensation ground simulation test device and method under the flight load function.
Steam condensation proving installation under a kind of ground simulation aerial sports load is made up of the polyphasic flow experimental system of flying the dynamic load analog platform and be installed on the platform, and the dynamic load of wherein flying analog platform is made up of rotating disk, motor, arrangements for speed regulation, frame; It is characterized in that: above-mentioned two-phase flow steam condensation test macro, it comprises steam-return line, cryogenic coolant loop, testing apparatus, experimental data collection preservation equipment; Above-mentioned steam-return line comprises high-pressure water tank; Wherein high-pressure water tank comprises the high pressure chest that is provided with high pressure chest air intake opening and high pressure chest water delivering orifice, and is provided with the low-pressure cavity of low-pressure cavity air intake opening and low-pressure cavity water inlet; Above-mentioned high-pressure water tank connects well heater, after-heater, transparent developmental tube according to this through the high pressure chest water delivering orifice, flows back to the low-pressure cavity water inlet again; Above-mentioned high pressure chest air intake opening also links to each other with first gas cylinder, and above-mentioned low-pressure cavity air intake opening also links to each other with the 3rd gas cylinder; Above-mentioned cryogenic coolant loop comprises low pressure tank; Wherein low pressure tank also comprises the high pressure chest that is provided with high pressure chest air intake opening and high pressure chest water delivering orifice, and is provided with the low-pressure cavity of low-pressure cavity air intake opening and low-pressure cavity water inlet; Above-mentioned low pressure tank through the high pressure chest water delivering orifice connect cooling collar according to this, refrigeration unit flows back to above-mentioned low-pressure cavity water inlet; Above-mentioned high pressure chest air intake opening also links to each other with second gas cylinder, and above-mentioned low-pressure cavity air intake opening also links to each other with the 3rd gas cylinder; Above-mentioned cooling collar is placed in the outside test section of forming of above-mentioned transparent developmental tube; Above-mentioned testing apparatus comprises electromagnetic flowmeter, pressure transducer, differential pressure pickup, temperature sensor, voidage tester, instant measurement of rotating speed appearance; Above-mentioned experimental data collection preservation equipment comprises data acquisition module, high speed camera, notebook computer.
Utilize the method for testing of steam condensation proving installation under the above-mentioned ground simulation aerial sports load; Its characteristic comprises following process: (1), utilization flight dynamic load analog platform simulated flight device maneuvering condition; Obtain the dynamic loadings of different sizes through regulating the platform rotating speed, thus the dynamic load state when the simulated flight device is motor-driven; (2) utilize the polyphasic flow experimental system to carry out the research of steam condensation test experiments.
Principle of work: the heater heats of flowing through a time after gas cylinder squeezes out the water of steam-return line water tank, then flow into after-heater, flow into test section again; Since a well heater add shortage of heat to be heated to water fluidized state and to produce many steam; Therefore after-heater is set, water is all converted to steam in after-heater, thereby flows into transparent developmental tube; Through the pipeline reflow tank, form a circulation then.Setting pressure sensor, differential pressure pickup, electromagnetic flowmeter, voidage tester and temperature sensor before and after the transparent developmental tube.All sensors of measuring fluid parameter are connected with notebook computer through data acquisition module, and experimental data just can be got off in real-time preservation like this.Through the velocity of rotation of adjustment universal stage, obtain the different horizontal centripetal acceleration in the experimentation, to simulate different flight overloads.Steam condenses and test macro all is fixed on the rotation platform, and then realizes condensing, flow and the heat exchange property experiment of dynamic load effect steam.This experiment porch transport that power does not adopt water pump but the more stable gas cylinder of the performance of usefulness, the purpose of doing like this is to reduce the vibrations of platform, thereby reduces mechanical influence and the electromagnetic effect of vibrations to each sophisticated sensor, makes experimental measurements higher.
An air and liquid mixer can be installed before a well heater in the above-mentioned steam-return line, and an inlet of air and liquid mixer links to each other with the high-pressure water tank water delivering orifice, and another inlet links to each other with first gas cylinder, and its outlet is connected with a described well heater.Form an air inlet branch road like this.Its effect is in steam, to sneak into air in certain amount, in order to carry out air, steam, water three-phase stream experimental study.What research was complicated more flows, condenses and the heat exchange situation.
Regulate the platform rotating speed and can obtain different dynamic loads, be installed in the instant rotating speed that instant measurement of rotating speed appearance on the platform can aware platform simultaneously, and note at any time through data acquisition system (DAS).
Steam condensation ground simulation test device under the above-mentioned aerial sports loading, transparent experiment pipeline section can be radially or circumferential arrangement or vertical the layout, and the angle of its inclination of scalable, thus the dynamic loading on the simulation different directions.Fluid flow direction is consistent with the turntable diameter direction in the time of radially, and is identical or opposite with the overload direction, but simulated flight device straight line quickens or the situation when slowing down.The experiment test pipeline section arranges that along the circumferential direction fluid flow direction is consistent with the tangent to periphery direction of turntable along pipeline section in the time of circumferentially, and direction is vertical with transshipping, but the simulated flight device is turned fast, the situation when underriding or pull-up.Pipeline section is vertical with flat surface arranges that fluid flow direction is vertical with platform in experiment when vertical, but the simulated flight device is done the action of rolling.
Steam condensation ground simulation test device is provided with the high speed DV under the above-mentioned air mobile loading near transparent testing tube, can take and write down condensing and flow state of steam in the transparent developmental tube.
Utilize the rotation platform can be in ground simulation air mobile load.It is combined with the series of vapor condensation experiments system, realized that the steam under the flight dynamic load condenses, ground experiment mobile and heat transfer property is studied.
Utilize the rotation platform can be in ground simulation air mobile load; Solved the problem that the maneuver load experiment must be boarded a plane and done; With do the method that high motor-driven dangerous play produces the dynamic load state through aircraft for a long time and compare; Security will be got well, and is not easy to damage experimental facilities, aircraft accident can not take place.Very high experimental expenses with respect to flight experiment; Practiced thrift very big cost; The dynamic load size can change rotating speed according to requirement of experiment regulates, and the dynamic load size can be controlled, and the dynamic load direction can be regulated through the putting position that changes transparent test pipeline section; The while experimental facilities is installed in indoor, so experimental period does not receive the influence of weather conditions.
Utilize rotation platform skimulated motion loaded-up condition very big advantage to be arranged with respect to dynamic load analogy method with straight rail accelerated motion.The dynamic load simulation of rotatable platform can be carried out in common lab, does not need very long acceleration orbit, quickens to go up the long track of km with respect to straight line, and rotation platform has been saved space and expense, than being easier to realization and affected by environment less.
Steam condensation proving installation under the movement load can be realized well, control and measure in the dynamic load change procedure; Carry out real-time data acquisition and preservation; Can obtain of the influence of dynamic load state through the contrast of experimental result and stationary state, solve the power delivery that is difficult to realize under the dynamic load status condition, circulated, heat and control and measuring problem in real time for the steam condensation.This system has steam and generates and the test function of condensing.Can measure in real time the flow gaps rate and with the test data in real time be kept in the notebook computer.The experiment test pipe adopts the transparent high temperature resistant glass tube, can see the mobility status of internal flow, can take steam condensation and flow state in the record transparent tube through the high speed DV.
In sum, quicken to compare with flight experiment with straight rail, this invention make steam condensation under the dynamic load effect, flow and the heat transfer characteristic experiment control more easily, more economical, safer.Steam condensation proving installation controllability is strong, and real-time is good.
Through steam condensation proving installation under the ground simulation aerial sports load, we can obtain annular flow, gap stream, wave flow, layering plunger, dropwise condensation, alternate characteristic and the flow resistance characteristic of mixing in the interior biphase gas and liquid flow condensation process of pipe under the motion dynamic load; Obtain the drop that forms, increases, changes and condense of liquid film in the motion dynamic load current downflow condensation process and form, coagulate the conflux characteristics of motion of variation of pearl; Obtain the Heat and Mass Transfer Characteristics of two-phase flow under the motion dynamic load.
Vibrations were littler when the use of gas cylinder power made under the ground simulation aerial sports load work of steam condensation proving installation, and performance is more stable, thereby reduces mechanical influence and the electromagnetic effect of vibrations to each sophisticated sensor, makes experimental measurements higher; The usable range of steam condensation proving installation under the ground simulation aerial sports load has been widened in the adding of air and liquid mixer, has promoted the use value of platform; This platform can also obtain the size of instant dynamic loading simultaneously, helps the analysis of experimental data more; Arrange for modular test section, more can be convenient to study the series of vapor condensation experiments data under the different directions dynamic loading according to the arbitrarily angled installation of experimental requirements.
Description of drawings
Fig. 1 is the load simulated device synoptic diagram of aerial sports.Wherein Fig. 1 (a) is a front view, and Fig. 1 (b) is a vertical view.Label title among its figure: 1, frame; 2, protection network; 3, rotating disk; 4, brushgear; 5, motor; 9, guardrail.
Fig. 2 is the series of vapor condensation experiments system schematic.Wherein heavy line is represented pipeline among Fig. 2, dotted line representation signal or signals collecting circuit.Label title among its figure: 11, low pressure tank; 12, high-pressure water tank; 13, second gas cylinder; 14, first gas cylinder; 15, the 3rd gas cylinder; 16, electromagnetic flowmeter; 17, solenoid valve; 18, air and liquid mixer; 19, well heater; 20, after-heater; 21, transparent developmental tube; 22, cooling collar; 23, high-speed camera; 24, voidage tester; 25, data acquisition module; 26, notebook computer; 27, panel box; 28, instant measurement of rotating speed appearance; 29, refrigeration unit; 30, blowdown valve.
Fig. 3 is transparent test pipeline section synoptic diagram.Be respectively steam inlet and cooling water inlet among the figure shown in the arrow; T representation temperature point position distributes among the figure; P representative pressure point position distributes; On behalf of the voidage point position,
distribute.
Specific embodiments
Further introduce the composition of the load simulated experiment porch of aerial sports in conjunction with Fig. 1.The high speed rotating of experiment porch requires experimental provision that very firm cement ground will be arranged.Motor 5 all is fixed on the frame 1 with rotating disk 3, can guarantee that so just whole flat is firm in operation, steady.Rotating disk 3 is connected with frame 1 through bearing, and the axis of rotating disk 3 couples together through belt and motor 5, and motor 5 drives the platform high speed rotating through belt, and the rotating speed of turntable obtains its rotating speed through instant speed measuring device, thereby learns its dynamic load size.The rotating speed of motor 5 is controlled and is regulated by frequency converter, and frequency converter is installed in the outside of platform.Because motor 5 usefulness is the three-phase power line, so the electric wire of whole flat will have ground protection.Because rotating disk 3 high speed rotating, experiment inevitably has certain danger.For ensureing the safety of experimentation, having under the situation of fender wall, the protection network of stainless steel has been installed.
Further introduce the composition of steam condensation ground simulation test device in conjunction with Fig. 2.First gas cylinder 14 squeezes into the loop with the water of steam-return line; The electromagnetic flowmeter 16, solenoid valve 17 of flowing through gets into a well heater 19 and is heated to boiling; Flowing into after-heater 20 again heats once more and changes water into steam; Steam flows into transparent developmental tube 21 again to its condensation, and the current of condensation return high-pressure water tank 12 then, forms a closed circuit system like this.Setting pressure sensor, differential pressure pickup, electromagnetic flowmeter, voidage tester and temperature sensor before and after the transparent testing tube.Second gas cylinder 13 of cooling circuit advances cooling circuit with the hydraulic pressure of low pressure chilled(cooling) water return (CWR), gets into cooling collar 22 cooling steams, through refrigeration unit 29 water temperature is reduced to normally again, flows back to low pressure cooling water tank 11 afterwards again.All sensors of measuring fluid parameter are connected with notebook computer 26 through several data acquisition modules 25, and experimental data just can preserve like this.The speed that can regulate rotating disk in the experimentation obtains different maneuver loads, can record the instant rotating speed of rotating disk through instant measurement of rotating speed appearance 28, thereby obtains instant dynamic load size.Transparent experiment pipeline section can be radially or circumferential arrangement or vertical the layout, and the angle of its inclination of scalable.Fluid flow direction is consistent with the turntable diameter direction in the time of radially, and is identical or opposite with the overload direction, but simulated flight device straight line quickens or the situation when slowing down.The experiment test pipeline section arranges that along the circumferential direction fluid flow direction is consistent with the tangent to periphery direction of turntable along pipeline section in the time of circumferentially, and direction is vertical with transshipping, but the simulated flight device is turned fast, the situation when underriding or pull-up.Pipeline section is vertical with flat surface arranges that fluid flow direction is vertical with platform in experiment when vertical, but the simulated flight device is done the action of rolling.
Steam condenser pipe road system and test macro thereof all are fixed on the load simulated experiment porch of aerial sports, and then realize steam condensation under the dynamic load effect, flow and the experiment of heat exchange property.
An air and liquid mixer 18 can be installed before a well heater 19 in the above-mentioned steam-return line, and an inlet of air and liquid mixer links to each other with solenoid valve 17 water delivering orifices, and another inlet links to each other with first gas cylinder 14, and its outlet is connected with a described well heater 19.Form an air inlet branch road like this.Its effect is in steam, to sneak into air in certain amount, in order to research complicated more have flowing, condense and the heat exchange situation of three-phase.
The all devices electricity consumption is all supplied with by panel box 17 on the platform.
Shown in Fig. 2 and 3, further introduce transparent developmental tube 21 inner sensor positions.Inwall at transparent developmental tube 21 as shown in the figure is respectively equipped with 5 thermometric faces, and the probe of temperature sensor stretches into transparent developmental tube 21 inwalls.First is used for measuring the fluid temperature (F.T.) before the steam condensation 5 thermometric faces, the 2nd, 3,4 fluid temperature (F.T.) that is used for measuring in the condensation, and last is used for measuring condensed fluid temperature (F.T.).
Claims (5)
1. steam condensation proving installation under the ground simulation aerial sports load; Be made up of the polyphasic flow experimental system of flying the dynamic load analog platform and be installed on the platform, the dynamic load of wherein flying analog platform is made up of rotating disk (3), motor (5), arrangements for speed regulation, frame (1); It is characterized in that:
Above-mentioned polyphasic flow experimental system, it comprises steam-return line, cryogenic coolant loop, testing apparatus, experimental data collection preservation equipment;
Above-mentioned steam-return line comprises high-pressure water tank (12); Wherein high-pressure water tank (12) comprises the high pressure chest that is provided with high pressure chest air intake opening and high pressure chest water delivering orifice, and is provided with the low-pressure cavity of low-pressure cavity air intake opening and low-pressure cavity water inlet; Above-mentioned high-pressure water tank (12) connects a well heater (19), after-heater (20), transparent developmental tube (21) according to this through the high pressure chest water delivering orifice, flows back to the low-pressure cavity water inlet again; Above-mentioned high pressure chest air intake opening also links to each other with first gas cylinder (14), and above-mentioned low-pressure cavity air intake opening also links to each other with the 3rd gas cylinder (15);
Above-mentioned cryogenic coolant loop comprises low pressure tank (11); Wherein low pressure tank (11) also comprises the high pressure chest that is provided with high pressure chest air intake opening and high pressure chest water delivering orifice, and is provided with the low-pressure cavity of low-pressure cavity air intake opening and low-pressure cavity water inlet; Above-mentioned low pressure tank (11) through the high pressure chest water delivering orifice connect cooling collar (22) according to this, refrigeration unit (29) flows back to above-mentioned low-pressure cavity water inlet; Above-mentioned high pressure chest air intake opening also links to each other with second gas cylinder (13), and above-mentioned low-pressure cavity air intake opening also links to each other with the 3rd gas cylinder (15);
Above-mentioned cooling collar (22) is placed in the outside test section of forming of above-mentioned transparent developmental tube (21);
Above-mentioned testing apparatus comprises electromagnetic flowmeter, pressure transducer, differential pressure pickup, temperature sensor, voidage tester, instant measurement of rotating speed appearance;
Above-mentioned experimental data collection preservation equipment comprises data acquisition module, high speed camera, computer.
2. steam condensation proving installation under the ground simulation aerial sports load according to claim 1; It is characterized in that: between a high-pressure water tank (12) and a well heater (19), be provided with air and liquid mixer (18), first gas cylinder (14) has another gas outlet to link to each other need to be used to the experimental study of gas phase with air and liquid mixer (18) simultaneously.
3. steam condensation proving installation under the ground simulation aerial sports load according to claim 1 is characterized in that: described test section is radially or circumferential arrangement on flight dynamic load analog platform, and its angle of inclination of scalable.
4. method of testing of utilizing steam condensation proving installation under the described ground simulation aerial sports of claim 1 load, its characteristic comprises following process:
(1), utilize flight dynamic load analog platform simulated flight device maneuvering condition, obtain the dynamic loadings of different sizes through regulating the platform rotating speed, thus the dynamic load state when the simulated flight device is motor-driven;
(2), utilize the polyphasic flow experimental system to carry out the research of steam condensation test experiments.
5. method of testing of utilizing steam condensation proving installation under the described ground simulation aerial sports of claim 2 load, its characteristic comprises following process:
(1), utilize flight dynamic load analog platform simulated flight device maneuvering condition, obtain the dynamic loadings of different sizes through regulating the platform rotating speed, thus the dynamic load state when the simulated flight device is motor-driven;
(2), utilize the polyphasic flow experimental system to carry out air, steam, water three-phase stream experimental study.
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| CN101963588A (en) * | 2010-08-24 | 2011-02-02 | 华东理工大学 | System for evaluating condensation heat transfer effect |
| CN104062110B (en) * | 2014-06-11 | 2016-11-02 | 江苏科技大学 | Aircraft liquid cold pipe-line system flow ground scaling method |
| CN104391002B (en) * | 2014-11-21 | 2017-08-18 | 陕西科技大学 | One kind simulation drying cylinder rotary condensation test device |
| CN106646059B (en) * | 2016-12-29 | 2020-02-11 | 北京金风科创风电设备有限公司 | Low-voltage electric device reliability testing device and system |
| CN108648578A (en) * | 2018-05-25 | 2018-10-12 | 中国科学院理化技术研究所 | Cryogen condenses visual experimental provision |
| CN109946104A (en) * | 2019-04-23 | 2019-06-28 | 陕西科技大学 | A kind of multichannel drying cylinder rotating platform and simulation multichannel drying cylinder rotate heat transfer testing system |
| CN110721756B (en) * | 2019-11-20 | 2023-04-25 | 吉林大学 | High-speed rotation experiment table with temperature gradient field and control method thereof |
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