Environment simulation wind tunnel high pressure power system and control method thereof

Abstract

The application discloses an environmental simulation wind tunnel high-pressure power system and a control method thereof, and belongs to the field of wind tunnel tests. The system is an environmental simulation wind tunnel high-pressure power system which comprises a main fan, a perfect non-harmonic frequency converter, a control cabinet containing a PLC, an oil dilution station, a heat dissipation fan and a heat dissipation fan soft start cabinet. The main fan is a bearing bush type high-pressure frequency conversion main fan. The power input end of the main fan is connected with the power output end of the perfect non-harmonic frequency converter through a cable. A rotary incremental encoder is installed at the non-driving end of the main fan. The oil supply input end and the oil return output end of the front and rear bearing bushes of the main fan are connected with the oil supply output end and the oil return input end of the oil dilution station through oil pipelines. The ventilation and heat dissipation outlet of the main fan is connected with the ventilation inlet of the heat dissipation fan. The application can provide continuous and stable airflow for a test area in a large environmental simulation wind tunnel, monitor and adjust the shaft lifting state of the main fan, avoid the influence of environmental temperature and provide continuous and stable airflow for the test area.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel testing technology, specifically relating to a high-pressure power system for an environmental simulation wind tunnel and its control method. Background Technology

[0002] Environmental simulation wind tunnels are used to conduct various types of environmental simulation tests. By configuring main fan systems, temperature and humidity simulation systems, rain and snow simulation systems, spray systems, and sunlight simulation systems, performance tests are carried out in accordance with the "GJB150-2009 Methods for Environmental Testing of Military Equipment Laboratories" to meet the test standard requirements under the corresponding working conditions.

[0003] For large-scale environmental simulation wind tunnels, due to the large power of the main fan, a 10kV high-voltage electric bearing-type motor is typically used to drive the fan rotation. This system configuration is relatively complex. On the one hand, a variable frequency speed control device is used to drive the main fan to achieve stepless speed regulation. On the other hand, because the temperature rise of the high-voltage motor during operation has a significant impact on insulation, it is necessary to handle the motor's ventilation and heat dissipation, real-time temperature monitoring, and reliable safety interlock measures. For environmental simulation tests, it is necessary to ensure that the operation of the bearing-type main fan is not affected by temperature changes. However, in reality, there are large temperature differences between winter and summer at the equipment site, which significantly affect its performance. Temperature differences mainly cause changes in the viscosity of the oil driving the bearing-type motor's shaft lift. Under the same supply flow, the shaft lift produced is different. When the temperature rises, the oil becomes thinner, and vice versa. The shaft lift height will therefore be lower or higher than the limit, affecting equipment performance and safe operation. When different sized nozzles are used in the test area for environmental simulation tests, the main fan's operating power and torque output are different, and the stress on the bearings changes significantly, which in turn affects the shaft lift and oil supply pressure. All of these factors necessitate a high-voltage power system for environmental simulation wind tunnel operation. Summary of the Invention

[0004] Based on the above shortcomings, the purpose of this invention is to provide a high-pressure power system and control method for an environmental simulation wind tunnel, so that the supplied oil viscosity is normal and the main fan is in a good state of shaft lifting, cooling and lubrication.

[0005] The specific technical solution of this invention is as follows: A high-pressure power system for an environmental simulation wind tunnel includes a main fan, a perfect harmonic-free frequency converter, a control cabinet containing a PLC, a thin oil station, a cooling fan, and a cooling fan soft starter cabinet. The main fan is a bearing-type high-pressure variable frequency main fan. The main fan is located near the airflow bend outlet in a long-distance flow channel on one side of the recirculation wind tunnel. The test area is located in the middle of two airflow bends in a long-distance flow channel on the other side of the recirculation wind tunnel. The test specimen undergoes environmental testing in the test area. The test area is equipped with replaceable nozzles and collectors to achieve different wind speed ranges.

[0006] The power input terminal of the main fan is connected to the power output terminal of the perfect harmonic-free frequency converter via a 10kV cable, and a rotary incremental encoder is installed on the non-drive end of the main fan.

[0007] The front and rear bearing oil supply input terminals of the main fan are connected to the oil supply output terminals of the thin oil station, and the front and rear bearing oil return output terminals are connected to the oil return input terminals of the thin oil station.

[0008] The ventilation and heat dissipation outlet of the main fan is connected to the ventilation inlet of the cooling fan, and the power input port of the cooling fan is connected to the power output port of the cooling fan soft starter cabinet via a cable.

[0009] Both the perfect harmonic-free frequency converter and the thin oil station are connected to the control cabinet through signal paths and communication links.

[0010] Furthermore, the thin oil station includes an oil storage tank, a low-pressure oil pump, a high-pressure oil pump, an oil temperature cooling device, and an oil tank temperature sensor. An electric heater is installed inside the oil storage tank. The oil supply output end of the oil storage tank is connected to the inlet pipe of the low-pressure oil pump. The temperature probe of the oil tank temperature sensor is inserted into the oil storage tank and fixedly connected to the outer shell of the oil storage tank via threads. An oil temperature cooling device is installed outside the outlet of the low-pressure oil pump. The outlet of the low-pressure oil pump is divided into two low-pressure oil pipe branches. A high-pressure oil pump is installed on the first low-pressure oil pipe branch. A high-pressure oil flow regulating valve and a high-pressure oil supply pressure sensor are sequentially installed on the outlet pipe of the high-pressure oil pump. A high-pressure oil circuit is formed by connecting sensors to the high-pressure oil inlets of the front and rear radial bearings of the main blower. A low-pressure oil flow regulating valve is installed on the second low-pressure oil pipe branch. An oil supply temperature sensor and a low-pressure oil supply pressure sensor are installed sequentially on the outlet pipe of the low-pressure oil flow regulating valve to form a low-pressure oil circuit. The low-pressure oil inlets of the front and radial bearings of the main blower are connected to the low-pressure oil outlet of the front bearing of the thin oil station, and the low-pressure oil inlet of the rear radial bearing of the main blower is connected to the low-pressure oil outlet of the rear bearing of the thin oil station. The return oil pipe of the main blower is connected to the return oil input end of the oil storage tank of the thin oil station.

[0011] Furthermore, the main fan is equipped with laser displacement sensors at both the shaft extension end and the non-shaft extension end of the bearing.

[0012] Furthermore, both the high-pressure oil circuit and the low-pressure oil circuit are equipped with oil supply pipeline heating devices.

[0013] Furthermore, the control cabinet controls the temperature of the thin oil station tank, the oil supply temperature, and the high-pressure oil supply pressure. The tank temperature is T0. When 25℃≤T0≤40℃, the low-pressure oil pump is activated. The ambient temperature is T01. When T01≤5℃, the oil supply pipeline heating device is activated. A rotary incremental encoder and a harmonic-free frequency converter form a closed-loop vector control system for the main fan, achieving precise speed control. When the main fan speed increases, the shaft lift height H0 changes accordingly. The control cabinet adjusts the high-pressure oil supply pressure P0 based on the shaft lift height H0 using a PID algorithm, i.e., 8MPa≤P0≤150MPa, ensuring the shaft lift height is always within a reasonable range, i.e., 130μm≤H0≤150μm. The specific calculation model for PID adjustment of the high-pressure oil supply pressure P0 is as follows:

[0014] F n =F n-1 +K p ×(H n -H n-1 )+Ki×H n-1 +K d ×(H n -2H n-1 +H n-2 )

[0015] Among them, F n and F n-1 These are the PID calculation results for high-pressure oil output pressure control during the current and previous power system runs, respectively, K. p H is the proportionality coefficient. n H is the difference between the current shaft lift height and the shaft lift height required to achieve the test target. n-1 H represents the shaft lift difference from the previous power system operation. n-2 The integral coefficient K represents the difference in shaft lift height between the two previous system runs. i =K p ×T÷T i Differential coefficient K d =K p ×T d ÷T, where T is the sampling period, which is a fixed value of 0.1s. i For the integration time, T d The differential time is 0.2≤Kp≤0.8, 130≤Ti≤1000, 5≤Td≤200, thus ensuring that the shaft lifting height is within a reasonable range and that the main fan is in good working condition.

[0016] Another objective of this invention is to derive a high-pressure power system control method for an environmental simulation wind tunnel using the above-described power system, the steps of which are as follows:

[0017] Step S10: Check the thin oil station. The oil tank temperature monitored by the oil tank temperature sensor is T0. When 25℃≤T0≤40℃, start the low-pressure oil pump. When T0<15℃ or T0>40℃, do not start the low-pressure oil pump. The ambient temperature is T01. When T01≤5℃, start the oil supply pipeline heating device. Otherwise, do not start the oil supply pipeline heating device and proceed to the next step.

[0018] Step S20: When T0 < 15℃, the control cabinet starts the electric heater inside the oil tank for PID adjustment until T0 ≥ 25℃, then proceeds to the next step;

[0019] Step S30: After the low-pressure oil pump starts, establish the low-pressure oil circuit between the thin oil station and the main blower. Observe whether there is liquid return in the oil storage tank and its oil supply temperature T1. If there is liquid return, proceed to the next step; otherwise, continue to wait until liquid return. When T1 < 35℃, the thin oil station operates normally. When 35℃ ≤ T1 < 40℃, the thin oil station will trigger a minor fault alarm but can still operate. When T1 ≥ 40℃, the thin oil station will trigger a major fault alarm, stop operation, and proceed to the next step.

[0020] Step S40: When T1≥35℃, the control cabinet performs PID adjustment of the internal cooling water circulation valve of the oil temperature cooling device to increase the circulation water flow. Repeat this step until T1<35℃, then proceed to the next step.

[0021] Step S50: Start the high-pressure oil pump to establish the high-pressure oil circuit between the thin oil station and the main blower. The bearing is lifted, and the lifting height H0 and the rising height H1 measured by the non-shaft extension end laser displacement sensor are obtained. When 130μm≤H0≤150μm and 130μm≤H1≤150μm, the high-pressure oil circuit is normal. When H0<130μm, H1<130μm, H0>150μm or H1>150μm, proceed to the next step.

[0022] Step S60: When H0 < 130μm or H1 < 130μm, reduce the pressure of the high-pressure oil flow regulating valve; when H0 > 150μm or H1 > 150μm, increase the pressure of the high-pressure oil flow regulating valve. Observe the high-pressure oil supply pressure sensor P0 until 8MPa ≤ P0 ≤ 15MPa, and when 130μm ≤ H0 ≤ 150μm and 130μm ≤ H1 ≤ 150μm, proceed to the next step.

[0023] Step S70: Before starting the machine, manually rotate the main fan. If the rotation is smooth, proceed to the next step; otherwise, repeat step S60.

[0024] Step S80: Start the cooling fan, start the perfect harmonic-free frequency converter, input a certain speed command to run the main fan, so that the test area obtains a certain wind speed. The control cabinet monitors the temperature of the motor stator winding and front and rear shafts of the main fan in real time. When it is higher than 80℃, an alarm is triggered. When it is higher than 100℃, the operation is cut off and the system is allowed to resume normal operation after the temperature drops.

[0025] Furthermore, in step S80, the perfect harmonic-free frequency converter uses a closed-loop vector control method to control the main fan, and the rotary incremental encoder adopts a complementary push-pull rotary incremental encoder with a speed control accuracy of ±0.1%.

[0026] The present invention has the following advantages and beneficial effects: The present invention realizes the automatic and reasonable adjustment of oil temperature and bearing lifting, and achieves high-precision, stable and reliable operation of the main fan by configuring a perfect harmonic-free frequency converter, control cabinet and cooling fan, avoiding temperature rise and reducing insulation, thereby improving system safety and test efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a high-pressure power system for an environmental simulation wind tunnel according to the present invention;

[0028] The components are as follows: 1: Main fan; 2: Perfect harmonic-free frequency converter; 3: Control cabinet; 4: Thin oil station; 5: Cooling fan; 6: Cooling fan soft starter cabinet; 7: Shaft extension end laser displacement sensor; 8: Non-shaft extension end laser displacement sensor; 9: Low-pressure oil flow regulating valve; 10: High-pressure oil flow regulating valve; 11: Low-pressure oil supply pressure sensor; 12: High-pressure oil supply pressure sensor; 13: Oil supply temperature sensor; 14: Oil tank temperature sensor; 15: Oil temperature cooling device; 16: Oil storage tank; 17: Low-pressure oil pump; 18: High-pressure oil pump; 19: Oil supply pipeline heating device; 20: Recirculating wind tunnel; 21: Test area. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1As shown, Embodiment 1 of the present invention provides a high-pressure power system for an environmental simulation wind tunnel, including a main fan 1, a perfect harmonic-free frequency converter 2, a control cabinet 3, a thin oil station 4, a cooling fan 5, and a cooling fan soft starter cabinet 6. The long axis × short axis of the recirculation wind tunnel 20 is 59.85m × 15.3m. The main fan 1 is a bearing-type high-pressure frequency converter main fan. The main fan 1 is located 6m from the second corner outlet of the wind tunnel in the north flow channel. The rated value of the frequency converter motor of the main fan 1 is... With a power output of 4MW, test area 21 is located between the first and fourth corners of the wind tunnel in the south flow channel. The outer perimeter of test area 21 is a sump chamber with dimensions of 25.6m (width) × 9.5m (height) × 15m (depth). It can accommodate the replacement of the open test section with a 6m × 5m nozzle and a 4m × 3m nozzle for environmental simulation tests; and the 4m × 3m closed test section for aerodynamic tests, which can achieve different maximum wind speeds of 80m / s, 35m / s, and 35m / s respectively.

[0032] The main fan 1 is equipped with a 1024-line complementary push-pull rotary incremental encoder on the non-drive end. It is connected to the encoder card in the perfect harmonic-free frequency converter 2 through a signal path to form a vector closed-loop control system. Its power input end is connected to the power output end of the perfect harmonic-free frequency converter 2 through a 10kV cable.

[0033] The thin oil station 4 includes an oil storage tank 16, a low-pressure oil pump 17, a high-pressure oil pump 18, an oil temperature cooling device 15, and an oil tank temperature sensor 14. The oil storage tank 16 is equipped with an electric heater with a heating power of 12kW. The oil storage tank 16 has a volume of 1600L, and a 0.08mm precision filter is installed at the oil tank outlet. The oil supply output end of the oil storage tank 16 is connected to the inlet pipe of the low-pressure oil pump 17. The temperature probe of the oil tank temperature sensor 14 is inserted into the oil storage tank 16 and fixedly connected and sealed to the outer shell of the oil storage tank 16 by threads. The temperature measurement range is 0~100℃. The oil temperature cooling device 15 is installed outside the outlet of the low-pressure oil pump 17, and the cooling area of ​​the oil temperature cooling device 15 is 7m². 2 Inlet and outlet water pipe diameter DN32, maximum flow rate 5.7m³ / h 3The low-pressure oil pump 17 has an inlet water temperature of 30℃ and a return water temperature not exceeding 35℃. Its outlet is divided into two low-pressure oil pipe branches. A high-pressure oil pump 18 is installed on the first low-pressure oil pipe branch. A high-pressure oil flow regulating valve 10 and a high-pressure oil supply pressure sensor 12 are sequentially installed on the outlet pipe of the high-pressure oil pump 18, forming a high-pressure oil circuit. The maximum flow rate is 15L / min, the maximum pressure is 15MPa, and the pipe diameter is DN10. Finally, it is connected to the high-pressure oil inlet of the front radial bearing of the main fan 1 and the high-pressure oil inlet of the rear radial bearing of the main fan 1, respectively. A low-pressure oil flow regulating valve 9 is installed on the second low-pressure oil pipe branch. An oil supply temperature sensor 13 and a low-pressure oil supply pressure sensor 11 are sequentially installed on the outlet pipeline of the low-pressure oil flow regulating valve 9 to form a low-pressure oil circuit with a maximum flow rate of 63 L / min, a maximum pressure of 0.4 MPa, and a pipe diameter of DN15. Finally, the low-pressure oil inlet of the front axle thrust bearing and the low-pressure oil inlet of the radial bearing of the main blower 1 are connected to the low-pressure oil outlet of the front axle bearing of the thin oil station 4. The low-pressure oil inlet of the rear axle radial bearing of the main blower 1 is connected to the low-pressure oil outlet of the rear axle bearing of the thin oil station. The return oil pipeline of the main blower 1 is connected to the return oil input end of the oil storage tank 16 of the thin oil station 4, with a total of 4 oil supply pipes and 1 return oil pipeline.

[0034] The ventilation and heat dissipation outlet of the main fan 1 is connected to the ventilation inlet of the cooling fan 5. The power of the cooling fan is 35kW. The 380V power input port of the cooling fan 5 is connected to the power output port of the cooling fan soft starter cabinet 6 via cable.

[0035] The perfect harmonic-free frequency converter 2 and the thin oil station 4 are connected to the control cabinet 3 through signal paths and communication links, including 24VDC switch signals, 4-20mA analog signals, Ethernet and fiber optic communication links.

[0036] The main fan 1 is equipped with a laser displacement sensor 7 at the shaft extension end and a laser displacement sensor 8 at the non-shaft extension end, with a measurement range of ±5mm and an accuracy of 10μm.

[0037] The high-pressure oil circuit and low-pressure oil circuit are equipped with an oil supply pipeline heating device 19 with a heating power of 6kW.

[0038] The control cabinet 3 controls the temperature of the oil storage tank 16, the oil supply temperature, and the high-pressure oil supply pressure of the thin oil station 4. The temperature of the oil storage tank 16 is T0. When 25℃≤T0≤40℃, the low-pressure oil pump 17 is started. The ambient temperature is T01. When T01≤5℃, the oil supply pipeline heating device 19 is started. A rotary incremental encoder and a perfect harmonic-free frequency converter are used to form a closed-loop vector control system for the main fan to achieve precise speed control. When the speed of the main fan 1 increases, the shaft lift height H0 changes accordingly. The control cabinet 3 adjusts the high-pressure oil supply pressure P0 according to the shaft lift height H0 through a PID algorithm, i.e., 8MPa≤P0≤150MPa, to ensure that the shaft lift height is always within a reasonable range, i.e., 130μm≤H0≤150μm. The specific calculation model for PID adjustment of the high-pressure oil supply pressure P0 is as follows:

[0039] F n =F n-1 +K p ×(H n -H n-1 )+Ki×H n-1 +K d ×(H n -2H n-1 +H n-2 )

[0040] Among them, F n and F n-1 These are the PID calculation results for high-pressure oil output pressure control during the current and previous power system runs, respectively, K. p H is the proportionality coefficient. n H is the difference between the current shaft lift height and the shaft lift height required to achieve the test target. n-1 H represents the shaft lift difference from the previous power system operation. n-2 The integral coefficient K represents the difference in shaft lift height between the two previous system runs. i =K p ×T÷T i Differential coefficient K d =K p ×T d ÷T, where T is the sampling period, which is a fixed value of 0.1s. i For the integration time, T d The differential time is 0.2≤Kp≤0.8, 130≤Ti≤1000, 5≤Td≤200, thus ensuring that the shaft lifting height is within a reasonable range and that the main fan 1 is in good working condition.

[0041] Example 2

[0042] This invention provides a control method for a high-pressure power system in an environmental simulation wind tunnel, comprising the following steps:

[0043] In a wind speed test, with an ambient temperature of 32℃, wind speeds of 8m / s, 15m / s, 25m / s, 30m / s, and 35m / s were achieved sequentially.

[0044] Step S10: Check the thin oil station 4 and confirm the following component temperatures: the oil tank temperature T0 monitored by the oil tank temperature sensor 14 is 32℃, start the low-pressure oil pump 17, the ambient temperature T01 is >5℃, do not start the oil supply pipeline heating device 19, the oil tank temperature is the same as the ambient temperature, and there is no need to heat up.

[0045] Step S20: T0 > 15℃, control cabinet 3 does not start the internal electric heater of oil tank 16 for PID adjustment, proceed to the next step;

[0046] Step S30: After the low-pressure oil pump 17 starts, establish the low-pressure oil circuit between the thin oil station 4 and the main blower 1. After waiting for 2 minutes, observe that there is liquid return in the oil storage tank 16. If the oil supply temperature T1 < 35℃, proceed to the next step. When a minor or major fault alarm occurs, the thin oil station executes step S40 repeatedly until the fault disappears.

[0047] Step S40: If T1≥35℃, control cabinet 3 performs PID adjustment of the internal cooling water circulation valve of oil temperature cooling device 15 to increase the circulation water flow. Repeat this step until T1<35℃, then proceed to the next step.

[0048] Step S50: Start the high-pressure oil pump 18 to establish the high-pressure oil circuit flow between the thin oil station 4 and the main blower 1. Lift the front and rear bearings and observe the lifting height H0 = 119 μm measured by the laser displacement sensor 7 at the shaft extension end and the lifting height H1 = 122 μm measured by the laser displacement sensor 8 at the non-shaft extension end. The high-pressure oil circuit is normal. Proceed to the next step.

[0049] Step S60: When H0 < 130μm or H1 < 130μm, reduce the pressure oil flow regulating valve 10; when H0 > 150μm or H1 > 150μm, increase the pressure oil flow regulating valve 10. Observe the pressure oil supply sensor P0 until 8MPa ≤ P0 ≤ 15MPa, and when 130μm ≤ H0 ≤ 150μm and 130μm ≤ H1 ≤ 150μm, proceed to the next step.

[0050] Step S70: Before starting the machine, manually rotate the main fan. If the rotation is smooth, proceed to the next step; otherwise, repeat step S60.

[0051] Step S80: Start the soft starter of the cooling fan 5, and the cooling fan 5 will run. Start the perfect harmonic-free frequency converter 2. The perfect harmonic-free frequency converter 2 is 10kV and adopts a closed-loop vector control mode to control the main fan 1. It adopts a complementary push-pull rotary incremental encoder with a speed control accuracy of ±0.1%. Input the speed commands of 22.9%, 42.9%, 71.4%, 85.7%, and 100% in sequence to run the main fan 1. Each command stays for 6 minutes of running time. Then the test area 21 obtains the target wind speed sequence. The control cabinet 3 monitors the temperature of the motor stator winding and the front and rear shafts of the main fan 1 in real time. The temperature starts to rise from 32℃. After running for half an hour, the temperature value is 45℃, and the heat dissipation and cooling are good. The system automatically monitors and alarms when it is higher than 80℃. When it is higher than 100℃, it cuts off the operation and waits for the temperature to drop before running normally.

[0052] Step S90: During the test, closely observe the shaft lifting status and the temperature and pressure status of the thin oil station 4. If the shaft lifting exceeds the limit or the thin oil station 4 malfunctions, check and repeat steps S10 to S80 until normal.

Claims

1. An environmental simulation wind tunnel high pressure power system, comprising a main fan (1), a perfect harmonic-free frequency converter (2), a control cabinet (3) containing a PLC, a thin oil station (4), a heat dissipation fan (5) and a heat dissipation fan soft start cabinet (6), the main fan (1) is a bushing type high pressure frequency conversion main fan, the main fan (1) is located near the airflow corner outlet in the long distance flow channel of one side of the backflow type wind tunnel (20), the test area (21) is located in the middle position of two airflow corners in the long distance flow channel of the other side of the backflow type wind tunnel (20), the test piece carries out environmental test in the test area (21), and the test area (21) is provided with replaceable nozzles and collectors to realize different wind speed ranges, characterized in that: the power input end of the main fan (1) is connected with the power output end of the perfect harmonic-free frequency converter (2) through a 10kV cable, and a rotary incremental encoder is installed at the non-driving end of the main fan (1); the oil supply input ends of the front and rear bushings of the main fan (1) are connected with the oil supply output end of the thin oil station (4), and the oil return output ends of the front and rear bushings are connected with the oil return input end of the thin oil station (4); the ventilation and heat dissipation outlet of the main fan (1) is connected with the ventilation inlet of the heat dissipation fan (5), the power input port of the heat dissipation fan (5) is connected with the power output port of the heat dissipation fan soft start cabinet (6) through a cable; and the perfect harmonic-free frequency converter (2) and the thin oil station (4) are connected with the control cabinet (3) through a signal path and a communication link. ​ ​ ​ ​ 2. An environmental simulation wind tunnel high pressure power system as in claim 1, wherein, The thin oil station (4) comprises an oil storage tank (16), a low-pressure oil pump (17), a high-pressure oil pump (18), an oil temperature cooling device (15) and an oil tank temperature sensor (14), the oil storage tank (16) is internally provided with an electric heater, the oil supply output end of the oil storage tank (16) is connected with the inlet pipeline of the low-pressure oil pump (17), the temperature probe of the oil tank temperature sensor (14) is inserted into the oil storage tank (16) and is fixedly connected with the shell of the oil storage tank (16) through screw threads, the oil temperature cooling device (15) is mounted on the outside of the outlet of the low-pressure oil pump (17), the outlet of the low-pressure oil pump (17) is divided into two low-pressure oil pipe branches, the first low-pressure oil pipe branch is provided with the high-pressure oil pump (18), the outlet pipeline of the high-pressure oil pump (18) is sequentially provided with a high-pressure oil flow regulating valve (10) and a high-pressure oil supply pressure sensor (12), forming a high-pressure oil path, and finally connected with the front shaft radial tile high-pressure oil inlet of the main fan (1) and the rear shaft radial tile high-pressure oil inlet of the main fan (1); the second low-pressure oil pipe branch is provided with a low-pressure oil flow regulating valve (9), the outlet pipeline of the low-pressure oil flow regulating valve (9) is sequentially provided with an oil supply temperature sensor (13) and a low-pressure oil supply pressure sensor (11), forming a low-pressure oil path, and finally connected with the front shaft thrust tile low-pressure oil inlet, the radial tile low-pressure oil inlet of the main fan (1) and the front shaft tile low-pressure oil outlet of the thin oil station (4), and the rear shaft radial tile low-pressure oil inlet of the main fan (1) and the rear shaft tile low-pressure oil outlet of the thin oil station (4); the oil return pipeline of the main fan (1) is connected to the oil return input end of the oil storage tank (16) of the thin oil station (4).

3. An environmental simulation wind tunnel high pressure power system as in claim 2, wherein, The main fan (1) is provided with a laser displacement sensor on the shaft extension end and the non-shaft extension end of the bearing tile.

4. An environmental simulation wind tunnel high pressure power system as in claim 3, wherein, The pipeline of the high-pressure oil path and the low-pressure oil path is provided with an oil supply pipeline heating device (19).

5. An environmental simulation wind tunnel high pressure power system as in claim 4, wherein, The control cabinet (3) controls the temperature of the oil storage tank, the oil supply temperature and the high-pressure oil path supply pressure, the temperature of the oil storage tank (16) is T0, when 25 DEG C <= T0 <= 40 DEG C, the low-pressure oil pump (17) is started, the ambient temperature is T01, when T01 <= 5 DEG C, the oil supply pipeline heating device (19) is started, a rotary incremental encoder and a perfect harmonic-free frequency converter (2) form a closed-loop vector control system for the main fan (1), and the rotational speed precision control is realized; when the rotational speed of the main fan (1) increases, the shaft lifting height H0 changes, the control cabinet (3) adjusts and changes the high-pressure oil supply pressure P0 value through the PID algorithm according to the shaft lifting height H0, that is, 8 MPa <= P0 <= 150 MPa, so that the shaft lifting height is always in a reasonable range, that is, 130 mu m <= H0 <= 150 mu m, and the specific PID adjustment high-pressure oil path pressure P0 calculation model is as follows: F n = F n-1 + K p × (H n - H n-1 ) + Ki × H n-1 + K d × (H n - 2H n-1 + H n-2 ) Wherein, F n and F n-1 are the PID operation results of high-pressure oil output pressure control at this time and last time, K p is the proportional coefficient, H n is the difference between the current shaft lifting height and the shaft lifting height required to achieve the test target, H n-1 is the shaft lifting difference of the previous power system operation, H n-2 is the shaft lifting height difference of the previous two system operations, the integral coefficient K i = K p × T ÷ T i , the differential coefficient K d = K p × T d ÷ T, T is a fixed value of 0.1s, T i is the integral time, T d is the differential time; 0.2≤Kp≤0.8, 130≤Ti≤1000, 5≤Td≤200, so as to realize the shaft lifting height in a reasonable range, and make the main fan (1) in good working performance.

6. The environmental simulation wind tunnel high pressure power system control method according to claim 5, wherein, The steps are as follows: Step S10: Check the oil station (4), the oil tank temperature sensor (14) monitors the oil tank (16) temperature T0, when 25℃≤T0≤40℃, then start the low-pressure oil pump (17), when T0<15℃ or T0>40℃, then do not start the low-pressure oil pump (17), the ambient temperature T01, when T01≤5℃ start the oil supply pipeline heating device (19), otherwise do not start the oil supply pipeline heating device (19), the next step; Step S20: When T0<15℃, the control cabinet (3) starts the electric heater inside the oil tank (16) for PID regulation until T0≥25℃, the next step; Step S30: After the low-pressure oil pump (17) is started, the low-pressure oil circuit flow between the oil station (4) and the main fan (1) is established, whether the oil tank (16) has backflow and its oil supply temperature T1 are observed, when there is backflow, the next step is performed, otherwise, it continues to wait until backflow, when T1<35℃, the oil station (4) operates normally, when 35℃≤T1<40℃, the oil station (4) has a light fault alarm, but can still operate, when T1≥40℃, the oil station has a heavy fault alarm and stops operating, the next step is performed; Step S40: When T1≥35℃, the control cabinet (3) performs PID regulation on the internal cooling water circulation valve of the oil temperature cooling device (15), increases the circulating water flow, and repeats this step until T1<35℃, the next step is performed; Step S50: Start the high-pressure oil pump (18) to establish the high-pressure oil circuit flow between the oil station (4) and the main fan (1), the bearing shell is lifted, the shaft lifting height H0 measured by the non-shaft extension end laser displacement sensor (7) and the lifting height H1 measured by the non-shaft extension end laser displacement sensor (8) are obtained, when 130μm≤H0≤150μm and 130μm≤H1≤150μm, the high-pressure oil circuit is normal, when H0<130μm, H1<130μm, H0>150μm or H1>150μm, the next step is performed; Step S60: When H0<130μm or H1<130μm, then adjust the high-pressure oil flow regulating valve to be small, when H0>150μm or H1>150μm, then adjust the high-pressure oil flow regulating valve to be large, observe the high-pressure oil supply pressure sensor P0, until when 8MPa≤P0≤15MPa, and when 130μm≤H0≤150μm and 130μm≤H1≤150μm, the next step is performed; Step S70: Before starting the vehicle, manually rotate the main fan (1), if the rotation is smooth, then the next step, otherwise, repeat step S60; Step S80: Start the cooling fan (5), start the perfect harmonic-free frequency converter (2), input a certain speed command to operate the main fan (1), so that the test area (21) obtains a certain wind speed, the control cabinet (3) monitors the temperature of the motor stator winding and the front and rear shafts of the main fan (1) in real time, when it is higher than 80℃, an alarm is given, when it is higher than 100℃, the operation is cut off, after the temperature drops, the operation is normal.

7. A method of controlling a high pressure power system of an environmental simulation wind tunnel as in claim 6, wherein, Step S80, the perfect harmonic frequency converter (2) adopts closed loop vector control mode to control the main fan (1), the rotation incremental encoder adopts complementary push-pull type rotation incremental encoder, the speed control precision is ±0.1%.

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