CN113092145B - A lunar surface working medium emission equivalent test device and method - Google Patents

Abstract

The invention discloses a lunar surface working medium emission equivalent test device and method, and the equivalent test method comprises the following steps: dividing a working medium discharge process into an internal pressure driving discharge stage, a gravity driving discharge stage and an evaporation driving discharge stage according to the physical characteristics of the working medium and the internal and external environments for discharging the working medium; determining main influence factors of each discharge stage, and establishing an analysis model between the working medium discharge influence factors and the working medium discharge rate; constructing an equivalent test device for simulating working medium discharge in a lunar environment based on an analysis model; and (3) simulating an actual on-orbit state, a thermal boundary and a working medium discharge initial state by using an equivalent test device. The method can realize equivalent working medium discharge simulation under the gravity environment of 1g/6 of the lunar surface under the gravity environment of 1g on the ground through equivalent simulation of an equivalent test device.

Description

A lunar surface working medium emission equivalent test device and method

technical field

The invention relates to the technical field of lunar probe working medium discharge, in particular to a lunar surface working medium discharge equivalent test device and method.

Background technique

At present, due to the limitation of carrying capacity, deep space probes are particularly limited in terms of weight resources. After the end of life of the thermal control fluid circuit on the lunar probe, the working fluid in the pipeline must be discharged to reduce the weight of the lunar surface ascender. , saving resource requirements for the detector system.

The lunar surface working fluid emission process is a complex mixing process of multiphase flow, continuous flow, and discontinuous flow. It is difficult to accurately obtain the emission degree through calculation methods with the flashing of the working medium and the endothermic process of phase change. The design of mass emissions brings difficulties. The ground system for working fluid discharge mainly involves working fluid discharge devices for refrigeration systems. There is no discontinuous flow process. It is only necessary to ensure that there is no solidification or desublimation of the working fluid during the discharge process, to avoid blockage during the discharge process and improve the discharge efficiency. It belongs to refrigeration. Technology and equipment field. Compared with the discharge of working fluid on the ground, the difference is that the lunar surface is a vacuum environment, and the gravity of the lunar surface is one-sixth of that of the ground. Among them, the vacuum environment on the lunar surface makes the discharge of working fluid very complicated, involving the flow of rarefied gas. Based on the current computational fluid dynamics theory, it is very difficult or difficult to calculate the discontinuous flow with Kn (Knudsen number) greater than 0.01. Accurate, especially for the complex detector pipeline system, it is impossible to obtain the working fluid discharge process by numerical simulation.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a lunar surface working medium discharge equivalent test device and method, the method establishes an equivalent test device on the ground according to the equivalent flow resistance of the lunar surface 1g/6 gravity environment, and can pass the equivalent test device. The equivalent simulation of the test device realizes the equivalent working fluid discharge simulation under the 1g/6 gravity environment of the lunar surface under the ground 1g gravity environment, and obtains the data of the working fluid discharge time and the working fluid discharge residual amount under the lunar surface state.

The present invention adopts following concrete technical scheme:

The invention provides a lunar surface working medium discharge equivalent test method, comprising the following steps:

According to the physical properties of the working fluid and the internal and external environment of the working fluid, the working fluid discharge process is divided into the internal pressure driven discharge stage, the gravity driven discharge stage and the evaporative driven discharge stage according to the driving pressure;

Determine the main influencing factors of each discharge stage, and establish an analytical model between the influencing factors of working fluid emissions and the working fluid discharge rate;

Based on the analytical model, an equivalent test device for simulating working fluid emissions in the lunar environment was constructed;

An equivalent test device is used to simulate the actual on-orbit state, thermal boundary and initial state of working fluid discharge.

Further, when determining the main influencing factors of each emission stage, the main influencing factors include the factors affecting the driving force of emission and the factors affecting the emission resistance, among which:

The main influencing factor of the internal pressure-driven discharge stage is the internal pressure of the circuit;

The main influencing factor in the gravity-driven emission phase is gravity;

The main influencing factor in the evaporation-driven emission stage is the saturated vapor pressure of the working medium.

Furthermore, in the establishment of the analytical model between the factors affecting the discharge of the working fluid and the discharge rate of the working fluid, in the continuous flow region far from the discharge port, the flow models of the three discharge stages all follow the following formulas for the relationship between flow rate and flow resistance:

ΔP=(ξ ₁ +ξ ₂ ·l/d)·ρu ² /2;

Among them, ΔP is the equivalent flow resistance, ξ ₁ is the local resistance coefficient, ξ ₂ is the resistance coefficient along the path, ρ is the working medium density, u is the working medium flow rate, l is the length of the conduit along the flow direction, and d is the inner diameter of the conduit .

Further, based on the analysis model, an equivalent test device for simulating working fluid emissions in the lunar surface environment is constructed, including:

Simplify each component in the lunar fluid circuit system, equivalent to a conduit of corresponding length according to the quality and installation position of each component, and connect the conduit as a fluid circuit. The height of the fluid circuit relative to the working medium discharge port is 1/6 of the actual height in the surface fluid circuit system;

A filling port hand valve is installed at one end of the fluid circuit, a discharge port hand valve and a working medium discharge valve are installed at the other end, and a flow resistance simulation valve and a pressure sensor for adjusting the flow resistance are installed in the fluid circuit, so that the equivalent The flow resistance of the test device is the same as the actual flow resistance;

The outlet of the working medium discharge valve is the working medium discharge port, which is connected to the vacuum tank used to simulate the vacuum environment on the lunar surface;

In the fluid circuit, an elastic component for providing the inner pressure of the circuit and a temperature control device for realizing the temperature distribution along the pipeline are installed, and the temperature control device is used to simulate the thermal boundary of the working medium.

Further, in the layout of the fluid circuit, the inclination angle β of the conduit is calculated by the following formula:

β=arcsin(1/6·sinθ);

Among them, β is the inclination angle in the equivalent test device, and θ is the inclination angle of the actual state of the lunar fluid circuit system.

Further, the diameter of the conduit in the equivalent test device is equal to the diameter of the tube in the rail state.

Further, the working medium is a liquid fluorocarbon working medium.

At the same time, the present invention also provides a lunar surface working medium discharge equivalent test device, including a conduit, a valve, a working medium, a flow resistance simulation valve, a pressure sensor and a vacuum tank;

the conduits are connected to form a fluid circuit;

The working medium is filled in the fluid circuit;

the valve is installed at the inlet and outlet of the fluid circuit;

The flow resistance simulation valve and the pressure sensor are installed in the fluid circuit, and the flow resistance simulation valve is used to adjust the flow resistance of the fluid circuit to be equal to the flow resistance of the lunar fluid circuit system in the orbit state;

The outlet of the fluid circuit forms a working medium discharge port and communicates with the vacuum tank.

Further, the valve includes a filling port hand valve installed at the inlet of the fluid circuit, a discharge port hand valve and a working fluid discharge valve installed at the outlet of the fluid circuit.

Further, the vacuum tank is provided with a working medium flow inlet connected with the working medium discharge port, and a vacuum gauge is installed inside the working medium flow inlet;

A test stand is provided at the bottom of the fluid circuit.

Beneficial effects:

The equivalent test method of the lunar surface working medium emission of the present invention is based on the analysis model of the lunar surface working medium emission and the actual structure layout of the detector, and an equivalent test device is established according to the flow resistance under the 1g/6 gravity environment of the lunar surface, and is used The equivalent test device simulates the thermal boundary of the working medium, realizes the test verification under ground conditions, and ensures the validity of the test verification. timing basis.

Description of drawings

Fig. 1 is the flow chart of the lunar surface working medium discharge equivalent test method of the present invention;

Fig. 2 is the principle structure schematic diagram of the fluid circuit in the lunar surface working medium discharge equivalent test device of the present invention;

Fig. 3 is the structural schematic diagram of the equivalent test device of the lunar surface working medium emission of the present invention;

Fig. 4 is a graph showing the pressure change during the ground working fluid discharge test process and the orbiting lunar surface working fluid discharge process.

Among them, 1-conduit, 2-flow resistance simulation valve, 3-vacuum tank, 4-inlet, 5-outlet, 6-working medium discharge port, 7-filling port hand valve, 8-discharge port hand valve, 9- Working fluid discharge valve, 10-vacuum gauge, 11-test bracket, 12-filling stop valve

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

Example 1

The embodiment of the present invention provides a lunar surface working medium emission equivalent test method, as shown in FIG. 1 , including the following steps:

Step S100, according to the physical properties of the working medium and the internal and external environment of the working medium, the working medium discharge process is divided into an internal pressure driven discharge stage, a gravity driven discharge stage and an evaporation driven discharge stage according to the driving pressure; the working medium may be liquid fluorine Carbon working medium; in the lunar surface 1g/6 gravity vacuum environment, the discharge of working medium involves complex processes such as liquid flash evaporation and gas-liquid two-phase critical flow; the external environment of working medium discharge port 6 is the lunar surface 1g/6 gravity environment, The moon surface is a vacuum; the working medium discharge port 6 is a pure liquid fluorocarbon working medium, and the internal charging pressure is P0. The working medium fills the entire connected loop system. Except for the compensator, which is a corrugated elastic part, other equipment and conduit 1 are is a rigid part;

Step S200, determine the main influencing factors of each discharge stage, and establish an analytical model between the working fluid discharge influencing factors and the working fluid discharge rate; in the continuous flow region far from the discharge port, the flow models of the three discharge stages follow the following flow rates and Flow resistance relationship formula:

ΔP=(ξ ₁ +ξ ₂ ·l/d)·ρu ² /2;

Among them, ΔP is the equivalent flow resistance, ξ ₁ is the local resistance coefficient, ξ ₂ is the resistance coefficient along the path, ρ is the working medium density, u is the working medium flow rate, l is the length of the conduit 1 along the flow direction, and d is the conduit 1 the inner diameter.

According to the analysis of the working fluid emission factors in each discharge stage, the main factors affecting the working fluid discharge include: (1) The internal pressure of the circuit, outside the discharge port of the fluid circuit is the lunar surface vacuum environment, and the driving force of the working fluid discharge is the pressure difference inside and outside the circuit , that is, the internal pressure of the loop. According to the equivalent flow resistance formula, it can be known that the pressure difference is proportional to the product of the square of the density and the flow velocity. The greater the internal pressure of the loop, the faster the discharge rate. Pressure, when the bellows of the compensator is compressed, the pressure can no longer be provided, then the internal pressure of the loop depends on the loop height difference and the saturated vapor pressure of the working medium; (2) The height difference, since the lunar surface gravitational acceleration is 1g/6, the The height difference of gravity gives priority to emptying, and at the same time, the height difference against gravity hinders the flow of working medium and becomes the resistance of working medium discharge. The height difference in the ground equivalent simulation is taken as 1/6 of the height of the moon; (3) Temperature, The temperature of the working fluid is a variable of the saturated vapor pressure of the working fluid. The higher the temperature of the working fluid and the higher the saturated vapor pressure, the greater the driving force. The temperature of the working fluid is a key factor affecting the discharge rate in the evaporative emission stage. Temperature boundary; (4) Flow resistance, the greater the resistance characteristic of the single-phase circuit system itself, the slower the discharge rate under the same driving pressure. The flow resistance of the single-phase circuit system is the inherent characteristic of the circuit pipeline and components, which is closely related to the pipeline. The spatial configuration and pipeline feature scale are related and do not change with the discharge process. The test device realizes the equivalent simulation of the flow resistance by adjusting and calibrating the flow resistance; (5) Attitude, the attitude of the working fluid directly affects the height difference of the discharge, The equivalent inclination angle β of the lunar inclination angle θ in the ground simulation is arcsin (1/6·sinθ); (6) The discharge amount of working medium, the discharge environment of working medium determines the discharge rate, so the discharge amount of working medium and the discharge time Positive correlation, for the loop system, the working medium discharge is mainly determined by the pipe length and pipe diameter of the loop conduit 1;

The main influencing factors of the internal pressure-driven discharge stage are the internal pressure, the distance between the compensator and the discharge port; the main influencing factors of the gravity-driven discharge stage are the height difference, the acceleration of gravity, the discharge port and the height difference against gravity along the route, attitude and other factors; The main influencing factor in the evaporation-driven emission stage is the saturated vapor pressure, and the apparent factor is the working fluid temperature. Among them, the gravity-driven discharge phase is also directly related to temperature.

When determining the main influencing factors of each discharge stage, the main influencing factors include the factors affecting the discharge driving force and the factors affecting the discharge resistance, among which: the main influencing factor of the internal pressure-driven discharge stage is the internal pressure of the circuit; The influencing factor is gravity; the main influencing factor in the evaporation-driven discharge stage is the saturated vapor pressure of the working medium;

Step S300, based on the analysis model, construct an equivalent test device for simulating the discharge of the working fluid under the lunar surface environment; according to the above formula of the relationship between the flow rate and the flow resistance, it can be known that ξ ₁ adjustment is realized through the adjustment of the flow resistance and the resistance coefficient along the route is realized by the pipeline layout Equivalent to ξ ₂ ; the internal pressure driving force can simulate the same internal pressure and extrusion volume through membrane elastic components such as compensators; in the gravity-driven discharge stage, the emptying position and discharge rate are jointly determined by gravity and the saturated vapor pressure of the working medium, Since the gravitational acceleration of the lunar surface is only 1/6 of the ground, the height difference of the pipeline layout in the vertical direction is 1/6 of the lunar surface, and the temperature of the working fluid is consistent with the value of the thermal analysis of the whole device. Evaporation of the working fluid will reduce the temperature. To maintain the temperature boundary, it is necessary to set up temperature control devices such as analog heaters; the main factor in the evaporation-driven discharge stage is the saturated vapor pressure determined by the temperature, which is consistent with the gravity discharge stage; Pipeline layout, the configuration layout is equivalently and reasonably simplified; through analysis, the amount of working fluid emission in the internal pressure driving stage is certain and the time is short, and the emission-related data can be accurately obtained through calculation, and the verification of this stage can be ignored in the test method. , Therefore, the compensator can be cancelled in the equivalent test device under 1g gravity on the ground; according to the Bond number similarity criterion, a smaller pipe diameter can be used in the ground verification. At the same time, in order to take into account the simulation of the same work quality, the pipe diameter that is consistent with the actual on-orbit is adopted, so that the test results can envelop the actual on-orbit state; in order to maintain the consistency of the work quality, the work quality of the simplified and cancelled equipment is determined by the corresponding pipe. In the length and width directions in the horizontal plane, the size of the test device is the same as that in the rail state; the total height difference in the vertical direction, and the high temperature position of the working medium discharge port 6 and the circuit system in the vertical direction, Both take 1/6 of the actual height; the inclination angle θ in the actual pipeline layout is equivalent to arcsin (1/6·sinθ) in the equivalent test device; the flow resistance simulation valve 2 is used to realize the pipe in the equivalent test device. The flow resistance of the road is consistent with the flow resistance of the real equipment, and the working medium discharge port 6 is the working medium discharge valve 9 that is consistent with the on-orbit state;

Step S400, using an equivalent test device to simulate the actual on-orbit state, thermal boundary and initial state of working fluid discharge; before the test, the working fluid equivalent test device needs to be filled with working fluid, and different areas along the pipeline need to be filled according to the actual on-orbit state. Perform temperature control; the equivalent test device includes a fluid circuit and a vacuum tank 3, the fluid circuit is arranged outside the vacuum tank 3, and the working medium discharge port 6 is connected to the vacuum tank 3; the equivalent test device can be set with different inclined attitudes to carry out multiple processes. In order to cover the on-orbit situation; the pressure near the working medium discharge port 6 in the vacuum tank 3 does not exceed 500Pa.

The lunar surface working medium discharge equivalent test method of the present invention simplifies and equals the actual pipeline structure in the on-orbit state on the basis of the lunar surface working medium discharge analysis model and the actual structure layout of the detector. Consistency, the working mass contained in the simplified and canceled equipment is replaced by a corresponding length of conduit 1; an equivalent test device is established according to the flow resistance under the 1g/6 gravity environment of the lunar surface, and the thermal boundary of the working medium is tested with the equivalent test device. The simulation realizes the test verification under ground conditions, ensures the validity of the test verification, and can obtain the emission time and working medium emission data, which provides a timing basis for the take-off of extraterrestrial celestial bodies in my country.

In a specific embodiment, based on the analysis model, an equivalent test device for simulating working fluid emission in a lunar surface environment is constructed, which specifically includes:

Simplify each component in the lunar fluid circuit system, equivalent to the corresponding length of conduit 1 according to the working quality and installation position of each component, and connect the conduit 1 as a fluid circuit, the fluid circuit is relative to the working medium discharge port 6. The height is 1/6 of the actual height in the lunar fluid circuit system;

A filling port hand valve 7 is installed at one end of the fluid circuit, a discharge port hand valve 8 and a working medium discharge valve 9 are installed at the other end, and a flow resistance simulation valve 2 and a pressure sensor for adjusting the flow resistance are installed in the fluid circuit. , so that the flow resistance of the equivalent test device is the same as the actual flow resistance;

The outlet 5 of the working medium discharge valve 9 is the working medium discharge port 6, which is connected to the vacuum tank 3 for simulating the vacuum environment on the lunar surface;

In the fluid circuit, an elastic component for providing the inner pressure of the circuit and a temperature control device for realizing the temperature distribution along the pipeline 1 are installed, and the temperature control device is used to simulate the thermal boundary of the working medium.

Further, in the layout of the fluid circuit, the inclination angle β of the conduit 1 is calculated by the following formula:

β=arcsin(1/6·sinθ);

Among them, β is the inclination angle in the equivalent test device, and θ is the inclination angle of the actual state of the lunar fluid circuit system.

Embodiment 2

The embodiment of the present invention also provides an equivalent test device for the emission of working fluid on the lunar surface. As shown in the structure of FIG. 3 , it includes a conduit 1, a valve, a working fluid, a flow resistance simulation valve 2, a pressure sensor, and a device for simulating the vacuum on the lunar surface. The vacuum tank 3 of the environment; as shown in the structure of Figure 2, the conduit 1 is connected to form a fluid circuit; the working medium is filled in the fluid circuit; the valve is installed at the inlet 4 and the outlet 5 of the fluid circuit; the flow resistance simulation valve 2 and the pressure sensor are installed in the In the fluid circuit, the flow resistance simulation valve 2 is used to adjust the flow resistance of the fluid circuit to be equal to the flow resistance of the lunar fluid circuit system in the on-orbit state; the outlet 5 of the fluid circuit forms the working medium discharge port 6 and communicates with the vacuum tank 3 . The valves may include a filler hand valve 7 installed at the inlet 4 of the fluid circuit, a drain hand valve 8 and a working fluid discharge valve 9 installed at the outlet 5 of the fluid circuit. The valve can be a valve that is consistent with the on-rail state; the vacuum tank 3 is provided with a working medium flow inlet (not shown in the figure) that communicates with the working medium discharge port 6, and a vacuum tank for measuring the inside of the working medium flow inlet is installed. A vacuum gauge 10 with a vacuum degree of 3; and a test stand 11 is supported at the bottom of the fluid circuit. In order to facilitate the filling of the working medium into the fluid circuit, as shown in the structure of FIG. 2 , a filling stop valve 12 is also installed between the inlet and the outlet of the fluid circuit.

The above-mentioned equivalent experimental device equals the actual on-orbit equipment to the corresponding length l of the conduit 1 and the height h relative to the discharge port according to the contained work quality and installation position. The specific implementation is as follows:

According to the structure shown in Figure 2, a DN8 transparent PVC (polyvinyl chloride, Polyvinyl chloride) hose is used to form a closed fluid circuit. The pump valve assembly, cold plate, and compensator are replaced with pipe lengths of equal quality, and the pipe length is more practical. The fluid circuit is longer; the vertical height H of the fluid circuit is 1/6 of the actual fluid circuit height, taking the working medium discharge port 6 as the reference point, the height of each pipeline relative to the working medium discharge port 6 is 1/6 of the actual relative height ; Connect the loop with the external circulation system, and adjust the flow resistance simulation valve 2 under the working fluid flow state, so that the flow resistance of the loop system is consistent with the flow resistance under the working state; discharge principle: first fill the test piece with working fluid, and then press the figure As shown in 3, the test piece working fluid discharge port 6 is connected to the vacuum tank 3. The volume of the vacuum tank 3 is calculated according to the working medium discharge rate and the suction rate of the vacuum pump, and the pressure of the discharge port needs to be maintained not exceeding 500Pa; Filled with working fluid, when the working fluid discharge valve 9 is opened, the working fluid is discharged into the vacuum tank 3 .

The following specific steps can be used for the equivalent test of working fluid emission:

1. Connect one end of the hand valve 7 of the filling port to the working medium barrel through the conduit 1, and one end of the working medium discharge valve 9 is connected to the working medium recovery barrel. Open the hand valve 7 of the filling port and the hand valve 8 of the discharge port, and the working medium discharge valve 9 is normally open; squeeze the working fluid into the pipeline of the test piece through the filling port hand valve 7 until there are no visible air bubbles at the outlet of the working medium discharge valve 9, then close the discharge port hand valve 8 and the filling port hand valve 7; At this time, the test piece is filled with liquid working medium;

2. According to the test conditions, set the temperature of the test piece until it reaches the target temperature;

3. According to the test conditions, the set inclination angle of the equivalent test device, the ground inclination angle β is calculated according to the formula β=arcsin(1/6·sinθ);

4. Before the start of the test, the vacuum in the vacuum tank 3 reaches below 10Pa, open the working medium discharge port 6, discharge the working medium into the vacuum tank 3, and start timing, close the discharge port valve within a predetermined time, and end the discharge;

5. Recover and weigh the residual working fluid in the equivalent test device;

6. During the test, the flow state in the tube can be observed through the transparent plastic tube, and the main factors affecting the discharge of the working fluid can be analyzed, or the inclination of the equivalent test device can be adjusted to analyze the discharge situation under different working conditions.

During the working fluid discharge test, the pressure change curve of the discharge test and the actual on-orbit pressure change curve are shown in Figure 4. By comparison, it can be seen that the working fluid discharge pressure is relatively consistent in trend. At the moment when the discharge starts, the pressure drops sharply from the normal pressure P0 to below 20kPa, then rises slowly, and then gradually decreases slowly. However, since the internal pressure discharge stage was not included in the test object during the discharge test, the time for pressure drop and recovery at the initial stage of discharge was different.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (3)

1. a lunar surface working medium discharge equivalent test method, is characterized in that, comprises the following steps: According to the physical properties of the working fluid and the internal and external environment of the working fluid, the working fluid discharge process is divided into the internal pressure driven discharge stage, the gravity driven discharge stage and the evaporative driven discharge stage according to the driving pressure; Determine the main influencing factors of each discharge stage, and establish an analytical model between the influencing factors of working fluid emissions and the working fluid discharge rate; Based on the analytical model, an equivalent test device for simulating working fluid emissions in the lunar environment was constructed; The equivalent test device is used to simulate the actual on-orbit state, thermal boundary and initial state of working fluid discharge; When determining the main influencing factors of each emission stage, the main influencing factors include the factors affecting the emission driving force and the factors affecting the emission resistance, among which: The main influencing factor of the internal pressure-driven discharge stage is the internal pressure of the circuit; The main influencing factor in the gravity-driven emission phase is gravity; The main influencing factor in the evaporation-driven emission stage is the saturated vapor pressure of the working medium; In the establishment of the analysis model between the factors affecting the discharge of working fluid and the discharge rate of working fluid, in the continuous flow region far from the discharge port, the flow models of the three discharge stages all follow the following formulas for the relationship between flow rate and flow resistance: ΔP=(ξ ₁ +ξ ₂ ·l/d)·ρu ² /2; Among them, ΔP is the equivalent flow resistance, ξ ₁ is the local resistance coefficient, ξ ₂ is the resistance coefficient along the path, ρ is the working medium density, u is the working medium flow rate, l is the length of the conduit along the flow direction, and d is the inner diameter of the conduit ; Based on the analytical model, an equivalent test device for simulating working fluid emissions in the lunar environment is constructed, including: Simplify each component in the lunar fluid circuit system, equivalent to a conduit of corresponding length according to the quality and installation position of each component, and connect the conduit as a fluid circuit. The height of the fluid circuit relative to the working medium discharge port is 1/6 of the actual height in the surface fluid circuit system; A filling port hand valve is installed at one end of the fluid circuit, a discharge port hand valve and a working medium discharge valve are installed at the other end, and a flow resistance simulation valve and a pressure sensor for adjusting the flow resistance are installed in the fluid circuit, so that the equivalent The flow resistance of the test device is the same as the actual flow resistance; The outlet of the working medium discharge valve is the working medium discharge port, which is connected to the vacuum tank used to simulate the vacuum environment on the lunar surface; In the fluid circuit, an elastic component for providing the inner pressure of the circuit and a temperature control device for realizing the temperature distribution along the conduit are installed, and the temperature control device is used to simulate the thermal boundary of the working medium; In the layout of the fluid circuit, the inclination angle β of the conduit is calculated using the following formula: β=arcsin(1/6·sinθ); Among them, β is the inclination angle in the equivalent test device, and θ is the inclination angle of the actual state of the lunar fluid circuit system. 2 . The equivalent test method for the emission of working fluid on the lunar surface according to claim 1 , wherein the pipe diameter in the equivalent test device is equal to the pipe diameter in the on-orbit state. 3 . 3. The lunar surface working medium emission equivalent test method according to any one of claims 1-2, wherein the working medium is a liquid fluorocarbon working medium.

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