Flow distribution test system and method for rotor-stator disc cavity with multi-inlet / multi-outlet characteristic

Abstract

The invention discloses a flow distribution test system and method for a rotor and stator disc cavity with a multi-inlet / multi-outlet characteristic. The flow distribution test system comprises a hollow electric main shaft, a shaft-shaped movable disc connection driving piece, a shaft-shaped movable disc connection secondary movable piece, a lining, a rotating and static disc, a static shield, a rotating acquisition instrument, a pressure scanning valve, a multi-path temperature inspection instrument, a temperature measuring point and a pressure measuring point, wherein the shaft-shaped movable disc connection driving piece and the shaft-shaped movable disc connection secondary movable piece are coaxially connected with the hollow electric main shaft; two air inlet schemes and two air outlet schemes are arranged at the rotor-stator disc cavity, and comprise high-position air inlet, central air inlet, receiving hole air outlet and rim air outlet; the inner disc of the stator disc system and the outer disc of the rotor disc system are provided with pressure measuring points, and the inner disc of the rotor-stator disc cavity is provided with temperature measuring points; data such as pressure and temperature are collected through a data collection system, and then the radial pressure drop coefficient and the flow distribution proportion of the rotor and stator disc cavity are obtained.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of engineering thermophysics, and particularly relates to a flow distribution test system and method for a rotating and stationary disk cavity with a multi-inlet / multi-outlet feature. BACKGROUND

[0002] One of the effective methods to improve the efficiency and output power of a gas turbine is to increase the inlet temperature of the turbine. However, air with too high a temperature can damage the rotor blades, so appropriate heat-resistant alloys and appropriate cooling systems must be used for the blades. The temperature of the turbine blades is usually reduced by cooling air extracted from the compressor. The cooling air is pumped to the blades through the cavities between the turbine disks. In addition, hot gases can be sucked into the disk cavity to damage the turbine disk. Therefore, it is necessary to inject sufficient air (extracted from the compressor) into the cavity to isolate the high-temperature combustion gas. In addition, too much air mass extracted from the compressor will reduce the output power of the gas turbine. At present, the rotating and stationary disk cavity of an aero-engine has achieved extensive research results, but is limited to the flow and heat transfer in the disk cavity structure with multiple inlets and a single outlet. Few studies have been conducted on the disk cavity with a near-real surface and multiple inlets and multiple outlets, and most of the experimental rotating speeds are 3000-5000 r / min, and the radius of the rotating and stationary disk cavity is 150-300 mm, corresponding to a rotating Reynolds number of 10 5 ~10 6 . In actual gas turbines, the radius of the first stage turbine disk of a power generation gas turbine is greater than 1200 mm, and the rotating speed is 3000 rpm. The radius of the first stage turbine disk of an aero-engine and an industrial gas turbine is slightly smaller, about 400 mm, but the rotating speed can be as high as 16000 r / min. At present, there is a large difference between the operating conditions of the disk cavity experiment and the actual operating conditions, so it is necessary to focus on the pressure drop and flow distribution mechanism of the rotating and stationary disk cavity with a multi-inlet / multi-outlet feature, which is crucial for the fine design of the secondary flow system. SUMMARY

[0003] The purpose of the present application is to provide a flow distribution test system and method for a rotating and stationary disk cavity with a multi-inlet / multi-outlet feature, which collects pressure, temperature and other data through a data acquisition system, and then obtains the pressure drop coefficient and flow distribution proportion along the radial direction of the rotating and stationary disk cavity.

[0004] Technical solution: The flow distribution test system for a rotating and stationary disk cavity with a multi-inlet / multi-outlet feature provided by the present application adopts the following technical solution:

[0005] A flow distribution test system with multi-inlet / multi-outlet characteristics of rotating and stationary disc cavity, comprising a hollow motorized spindle, a shaft-shaped driving disc connecting primary driving part and driving disc connecting secondary driving part coaxially connected with the hollow motorized spindle, a bushing, a rotating and stationary disc, a stationary shroud, a rotating collector, a pressure scanning valve, a multi-channel temperature inspection instrument, a temperature measuring point, a pressure measuring point; the driving disc connecting primary driving part is located between the hollow motorized spindle and the driving disc connecting secondary driving part; the bushing is used to support the driving disc connecting secondary driving part, and the bushing and the driving disc connecting secondary driving part are connected through a bearing;

[0006] The rotating and stationary disc comprises a coaxially arranged stator outer disc, a stator adiabatic disc, a stator inner disc, a rotor inner disc and a rotor outer disc, the stator adiabatic disc is located between the stator outer disc and the stator inner disc; the rotor inner disc is located between the rotor outer disc and the stator inner disc, and a cavity is formed between the rotor inner disc and the stator inner disc; the driving disc connecting primary driving part passes through the stator outer disc, the stator adiabatic disc and the stator inner disc without contact and forms a gap as a central air inlet channel; the rotor inner disc, the rotor outer disc and the driving disc connecting primary driving part are fixedly connected;

[0007] The stationary shroud comprises a stator side lower shroud surrounding the driving disc connecting secondary driving part, a stator side upper shroud surrounding the stator side lower shroud, a stator side outer shroud sealing the outside of the stator side lower shroud and the outside of the stator side upper shroud, a supercharging shroud surrounding the stator side upper shroud and the rotating and stationary disc, and a rotor side stationary shroud sealing the side opposite to the supercharging shroud and the stator side outer shroud;

[0008] The two ends of the stator side lower shroud are connected with the bushing and the stator outer disc respectively; the bushing, the stator side lower shroud and the stator outer disc surround a central air inlet cavity; the stator side lower shroud, the stator side outer shroud and the stator side upper shroud surround a high-position air inlet cavity; the outer wall surface of the rotating and stationary disc, the supercharging shroud, the stator side shroud, the rotor side stationary shroud and the hollow motorized spindle surround a rim air outlet cavity; the outer wall surface of the rotor inner disc and the inner wall surface of the rotor outer disc surround a receiving hole air outlet cavity;

[0009] The high-position air inlet hole, the radial through hole and the central air inlet channel, the receiving hole outlet and the rim outlet are arranged; the high-position air inlet hole is arranged at the circumferential position of the high-position air inlet cavity, cold air enters the high-position air inlet cavity through the four radial through holes of the stator side outer shroud, and then enters the rotating and stationary disc cavity through the high-position air inlet hole; the cold air enters the central air inlet cavity through the central air inlet channel; the receiving hole outlet is located in the rotor inner disc and communicates the receiving hole air outlet cavity and the cavity formed between the rotor inner disc and the stator inner disc; the rim outlet is a gap between the rotor inner disc rim and the stator inner disc rim;

[0010] The dynamic disc connecting driving part is provided with a small hole for connecting the receiving hole outlet gas cavity and the hollow electric spindle inside; a part of the outlet gas flows into the receiving hole outlet gas cavity from the receiving hole outlet, enters the hollow electric spindle through the radial through hole of the dynamic disc connecting driving part, and then flows into the environment; another part of the outlet gas flows out from the rotor outer disc rim gap, enters the booster shroud, and then flows into the environment;

[0011] The rotating acquisition instrument is arranged at one end of the hollow electric spindle.

[0012] The temperature measuring points are arranged on the stator inner disc and the rotor outer disc and are distributed along the radial direction; the temperature measuring points are arranged on the stator inner disc and are linearly distributed along the radial direction; the rotating acquisition instrument, the pressure scanning valve and the multi-channel temperature inspection instrument are used to acquire pressure and temperature signals.

[0013] Further, the gas compressor, the gas tank, the electromagnetic valve, the drying filter screen, the pressure stabilizing box and the mass flow controller jointly constitute a gas supply and adjustment system.

[0014] Further, the magnetic fluid seal is arranged on the side of the hollow electric spindle bearing and the dynamic disc connecting secondary driving part.

[0015] Further, the pressure measuring points are arranged at two positions with the same radius and are spaced 180° apart, there are 12 pressure measuring points on the stator inner disc and 2 pressure measuring points on the rotor outer disc; the temperature measuring points are linearly distributed along the radial direction, there are 4 temperature measuring points arranged at positions with the same radius and spaced 90° apart, there are 60 temperature measuring points on the stator inner disc, and the temperature measuring points on the stator disc are led out from the stator outer disc side and are connected with the multi-channel temperature inspection instrument to directly read the stator disc wall temperature.

[0016] Further, the rotating speed of the hollow electric spindle is 15000 rpm at most.

[0017] Further, the materials of the stator outer disc and the rotor inner disc are aviation hard aluminum 7075; the material of the stator heat insulation disc is bakelite, and the materials of the stator inner disc and the rotor inner disc are titanium alloy; there are 12 axial air inlet through holes with a diameter of 10 mm circumferentially arranged at a position 156 mm away from the shaft center line in the middle part of the stator outer disc, the stator heat insulation disc and the stator inner disc; a distance of 5 mm is arranged between the bottom of the axial air inlet through hole and the driving part of the auxiliary support; the material of the rotor outer disc is aviation hard aluminum 7075, and the material of the rotor inner disc is titanium alloy; there are 60 axial air outlet holes with a diameter of 10 mm circumferentially arranged at a position 200 mm away from the shaft center line in the upper part of the rotor inner disc.

[0018] Further, the stator inner disc and the rotor outer disc rim are provided with an air outlet gap, the axial distance of the air outlet gap changes with the left and right movement of the stator inner disc, and the change range is 1-5 mm; there are 4 radial through holes with a diameter of 10 mm, and there are 4 axial through holes with a diameter of 20 mm arranged at a position 278 mm away from the shaft center line on the rotor side of the booster shroud, and the axial through holes also penetrate the rotor side shroud.

[0019] The application also provides a test method using the flow distribution test system, and the specific steps are as follows:

[0020] Step 1: Prepare the rotating and static disc as a test piece;

[0021] Step 2: Debug the rotating acquisition instrument to ensure normal operation and accurate data;

[0022] Step 3: Arrange pressure measuring points and temperature measuring points on the rotating and static disc;

[0023] Step 4: Build the overall pipeline and test bench, assemble the rotating and static disc components on the test bench, connect the pressure measuring point line of the rotor outer disc along the hollow motor spindle axis to the rotating acquisition instrument, and connect the pressure measuring point and temperature measuring point line of the stator inner disc to the pressure scanning valve multi-channel temperature inspection instrument respectively;

[0024] Step 5: Air tightness test, connect the calibrated measuring instruments and pipelines, reinforce and seal at the interface by installing rubber gaskets and sealant, and use an air compressor as a gas source for air supply debugging;

[0025] Step 6: Determine the test working condition, start the rotating acquisition instrument, and start recording the temperature and heat flow signals;

[0026] Step 7: Start the air compressor to supply air, open the exhaust bypass to prevent excessive pressure in the pipeline, and monitor the flow rates of the center inlet, high inlet, receiving hole outlet and rim outlet;

[0027] Step 8: Start the water cooler to provide cooling conditions for the motor spindle;

[0028] Step 9: Start the rotating motor spindle, and adjust the rotating speed to reach the target rotating speed;

[0029] Step 10: During the test, read the test pressure and temperature signals through the data acquisition system, and after the test, calculate and analyze the along-path pressure drop coefficient along the radial direction of the rotating and static disc cavity The calculation process is as follows:

[0030]

[0031] In the formula, is the absolute static pressure measured by the pressure measuring point on the stator inner disc (28), Pa; is the absolute static pressure measured by the pressure measuring point on the rotor outer disc, Pa; is the incoming flow density, which is calculated by the temperature inspection instrument, the rotating acquisition instrument and the thermocouple combination, kg / m 3 ; is the rotating disc angular velocity, which is a set value of the frequency converter, rad / s; b is the highest radius in the rotor inner disc cavity, which is a fixed value of 0.25, m.

[0032] The flow proportion calculation process is as follows:

[0033]

[0034]

[0035]

[0036]

[0037] In the formula, represents the center inlet flow, represents the high inlet flow, represents the receiving hole outlet flow, represents the rim outlet flow.

[0038] Beneficial effects: The application realizes a flow distribution test system and method with a multi-inlet / multi-outlet characteristic rotating and stationary disc cavity, collects pressure, temperature and other data through a data acquisition system, and then obtains the pressure drop coefficient of the rotating and stationary disc cavity along the radial direction , flow distribution proportion, and realizes fine design of a secondary flow system. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a test system schematic diagram in the application;

[0040] Figure 2 is a test bench overall assembly diagram in the application;

[0041] Figure 3 is a rotating and stationary disc cavity schematic diagram in the application;

[0042] Figure 4 is an auxiliary support and stationary shroud structure schematic diagram in the application;

[0043] Figure 5 is a center air inlet, high air inlet, receiving hole air outlet and rim air outlet scheme schematic diagram in the application;

[0044] Figure 6 is a measurement point layout diagram in the application. DETAILED DESCRIPTION

[0045] The application discloses a kind of air-driven piston driven air inlet duct profile auxiliary adjusting device, the following in conjunction with drawing, the technical scheme provided by the application is described in detail.

[0046] Example one

[0047] Reference Figures 1 to 6As shown, the present invention discloses a flow distribution test system with a rotating stationary disk cavity featuring multiple inlets / outlets, comprising a hollow electric spindle 1, a rotating stationary disk 2, an auxiliary support 3, a stationary protective cover 4, a magnetic fluid seal 5, a rotary data acquisition instrument 6, a pressure scanning valve 15, a multi-channel temperature monitoring instrument 16, a computer 17, temperature measuring points 40 (thermocouples), pressure measuring points 41, a compressor 9 that together constitutes the air supply and regulation system, an air storage tank 10, a solenoid valve 11, a drying filter 12, a pressure stabilizing box 13, and a mass flow controller 14.

[0048] The auxiliary support 3 includes a shaft-shaped moving disk connecting active component 31 and a moving disk connecting secondary component 32 coaxially connected to the hollow electric spindle 1, a bushing 33, and an inner magnetohydrodynamic seal 34. The magnetohydrodynamic seal 5 is installed on the bearing side of the hollow electric spindle 1 and on the moving disk connecting secondary component 32.

[0049] The moving plate connecting drive component 31 is located between the hollow electric spindle 1 and the moving plate connecting secondary drive component 32; the bushing 33 is used to support the moving plate connecting secondary drive component 32, and the bushing 33 and the moving plate connecting secondary drive component 32 are connected by bearings.

[0050] The rotor-stationary disk 2 includes a coaxially arranged stator outer disk 26, stator insulating disk 27, stator inner disk 28, rotor inner disk 29, and rotor outer disk 30. The stator insulating disk 27 is located between the stator outer disk 26 and the stator inner disk 28; the rotor inner disk 29 is located between the rotor outer disk 30 and the stator inner disk 28, and a cavity is formed between the rotor inner disk 29 and the stator inner disk 28; the moving disk connecting active member 31 passes through the stator outer disk 26, stator insulating disk 27, and stator inner disk 28, and does not contact the stator outer disk 26, stator insulating disk 27, and stator inner disk 28, forming a gap as a central air intake duct 18; the rotor inner disk 29 and rotor outer disk 30 are fixedly connected to the moving disk connecting active member 31. The bushing 33 has an axial through hole 22 to supply air to the central air intake duct 18.

[0051] The stationary shield 4 includes a lower stator-side shield 37 surrounding the secondary moving part 32 connected to the moving disk, an upper stator-side shield 35 surrounding the lower stator-side shield 37, an outer stator-side shield 36 enclosing the outer sides of the lower stator-side shield 37 and the upper stator-side shield 35, a pressurizing shield 38 surrounding the upper stator-side shield 35 and the rotating disk 2, and a rotor-side stationary shield 39 enclosing the side opposite to the pressurizing shield 38 and the outer stator-side shield 36.

[0052] The two ends of the stator side lower shroud 37 are connected with the bushing 33 and the stator outer disc 26 respectively; the bushing 33, the stator side lower shroud 37 and the stator outer disc 26 enclose a central air inlet cavity 42; the stator side lower shroud 37, the stator side outer edge shroud 36 and the stator side upper shroud 35 enclose a high-position air inlet cavity 43; the outer wall surface of the rotor-stator disc 2, the pressurizing shroud 38, the stator side shroud 36, the rotor side stationary shroud 39 and the hollow motor spindle 1 enclose a rim air outlet cavity 44; the outer wall surface of the rotor inner disc 29 and the inner wall surface of the rotor outer disc 30 enclose a receiving hole air outlet cavity 45.

[0053] The high-position air inlet hole 19, the radial through hole 23, the central air inlet channel 18, the receiving hole outlet 20 and the rim outlet 21 are arranged; the high-position air inlet hole 19 is arranged at the circumferential position of the high-position air inlet cavity, and cold air enters the rotor-stator disc cavity 2 from the high-position air inlet hole 19 after entering the high-position air inlet cavity 43 through the four radial through holes 23 of the high-position air inlet of the stator side outer edge shroud 36; the cold air enters the central air inlet cavity 42 through the central air inlet channel 18; the receiving hole outlet 20 is located on the rotor inner disc 29 and communicates with the receiving hole air outlet cavity 45 and the cavity formed between the rotor inner disc 29 and the stator inner disc 28; and the rim outlet 21 is a gap between the rim of the rotor inner disc 29 and the rim of the stator inner disc 28.

[0054] The moving disc connecting driving member 31 is provided with a small hole for connecting the receiving hole air outlet cavity 45 and the inside of the hollow motor spindle 1; a part of the outlet gas flows into the receiving hole air outlet cavity 45 from the receiving hole outlet 20, enters the hollow motor spindle 1 through the radial through hole of the moving disc connecting driving member 31, and then is discharged to the environment; another part of the outlet gas flows out from the gap of the rim of the rotor-stator disc 2, enters the pressurizing shroud 38, and then is discharged to the environment;

[0055] The rotating collection instrument 6 is arranged at one end of the hollow motor spindle 1.

[0056] The temperature measuring points 40 are located on the stator inner disc 28 and the rotor outer disc 30 and are distributed along the radial direction; the temperature measuring points 40 are linearly distributed along the radial direction on the stator inner disc 28; the rotating collection instrument 6, the pressure scanning valve 15 and the multi-channel temperature inspection instrument 16 are used to collect pressure and temperature signals.

[0057] The pressure measuring points 41 are located at two positions with the same radius and are arranged at intervals of 180°; there are 12 pressure measuring points 41 on the stator inner disc 28 and 2 pressure measuring points 41 on the rotor outer disc 30; the temperature measuring points 40 are linearly distributed along the radial direction and are arranged at intervals of 90° at four positions with the same radius; there are 60 temperature measuring points 40 on the stator inner disc 28; the temperature measuring points on the stator disc are connected with the multi-channel temperature inspection instrument 16 and directly read the temperature of the wall surface of the stator disc.

[0058] The stator outer disc 26, the rotor inner disc 29 material is aviation hard aluminum 7075 stator adiabatic disc 27 material is bakelite, the stator inner disc 28, the rotor inner disc 29 material is titanium alloy;Stator outer disc 26, stator adiabatic disc 27, stator inner disc 28 middle part is equidistant from the axis center line 156 mm and is circumferentially provided with 12 axial air inlet through holes with 10 mm diameter;Its bottom and the driving element between auxiliary support 3 are provided with air inlet gap with 5 mm distance;Rotor outer disc 30 material is aviation hard aluminum 7075, and the rotor inner disc 29 material is titanium alloy;Rotor inner disc 29 upper part is equidistant from the axis center line 200 mm and is circumferentially provided with 60 axial air outlet holes with 10 mm diameter.

[0059] The stator inner disc 28 and rotor outer disc 30 rim are provided with air outlet gap, and the axial distance of the air outlet gap changes with the left and right movement of the stator inner disc 28, and the change range is 1-5 mm;Radial through hole 23 is provided with 4 and diameter 10 mm, and the rotor side of booster shroud 38 is provided with 4 axial through holes 25 with 20 mm diameter at the axis center line 278 mm, and the axial through hole 25 also penetrates the rotor side shroud 39.

[0060] Example two

[0061] The test method of the flow distribution test system of example one is used in this embodiment, and the specific steps are as follows:

[0062] Step 1: prepare the rotating and static disc as test piece;

[0063] Step 2: debug the rotation acquisition instrument to ensure normal work and accurate data;

[0064] Step 3: arrange pressure measuring points and temperature measuring points on the rotating and static disc;

[0065] Step 4: build overall pipeline and test bed, assemble the rotating and static disc element on the test bed, connect the pressure measuring point line of the rotor outer disc 30 along the hollow electric spindle axis to the rotation acquisition instrument, and connect the pressure measuring point and temperature measuring point line of the stator inner disc 28 to the pressure scanning valve multi-channel temperature patrol instrument respectively;

[0066] Step 5: air tightness test, connect the calibrated measuring instrument and pipeline, reinforce and seal at the interface by installing rubber gasket and sealing glue, and use air compressor as air source for air supply debugging;

[0067] Step 6: determine the test condition, start the rotation acquisition instrument, and start recording temperature and heat flow signal;

[0068] Step 7: open the air compressor to start air supply, open the exhaust bypass to prevent excessive pressure in the pipeline, and monitor the flow of central inlet, high inlet, receiving hole outlet and rim outlet;

[0069] Step 8: Start the water cooling machine to provide cooling conditions for the electric spindle;

[0070] Step 9: Start the rotating electric spindle, adjust the rotating speed to reach the target rotating speed;

[0071] Step 10: During the test, read the test pressure and temperature signals through the data acquisition system, and calculate and analyze the pressure drop coefficient along the radial direction after the end of the test The calculation process is as follows:

[0072]

[0073] In the formula, P is the absolute static pressure measured by the pressure measuring point on the stator inner disc (28), Pa; P is the absolute static pressure measured by the pressure measuring point on the rotor outer disc 30, Pa; is the flow density, which is measured by a combination of a temperature detector, a rotating collector and a thermocouple, kg / m 3 ; is the rotating disc angular velocity, which is a pre-set value of the frequency converter, rad / s; b is the highest radius in the rotor inner disc 29 cavity, which is a fixed value of 0.25, m.

[0074] The flow ratio calculation process is as follows:

[0075]

[0076]

[0077]

[0078]

[0079] In the formula, Qc represents the central inlet flow, Qh represents the high inlet flow, Qo represents the receiving hole outlet flow, Qf represents the rim outlet flow.

[0080] In addition, the specific implementation methods and approaches of the present application are many, and the above description is only the preferred embodiment of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A flow distribution test system with a multi-inlet / multi-outlet rotating plate cavity, characterized in that, The device includes a hollow electric spindle (1), a shaft-shaped moving disk connecting active component (31) coaxially connected to the hollow electric spindle (1), a moving disk connecting secondary component (32), a bushing (33), a rotating stationary disk (2), a stationary protective cover (4), a rotary data acquisition instrument (6), a pressure scanning valve (15), a multi-channel temperature monitoring instrument (16), a temperature measuring point (40), and a pressure measuring point (41). The moving disk connecting active component (31) is located between the hollow electric spindle (1) and the moving disk connecting secondary component (32). The bushing (33) is used to support the moving disk connecting secondary component (32), and the bushing (33) and the moving disk connecting secondary component (32) are connected by bearings. The rotating stationary disk (2) includes a stator outer disk (26), a stator insulating disk (27), a stator inner disk (28), a rotor inner disk (29), and a rotor outer disk (30) arranged coaxially. The stator insulating disk (27) is located between the stator outer disk (26) and the stator inner disk (28). The rotor inner disk (29) is located between the rotor outer disk (30) and the stator inner disk (28), and a cavity is formed between the rotor inner disk (29) and the stator inner disk (28). The moving disk connecting active member (31) passes through the stator outer disk (26), the stator insulating disk (27), and the stator inner disk (28) and does not contact the stator outer disk (26), the stator insulating disk (27), and the stator inner disk (28), forming a gap as a central air intake (18). The rotor inner disk (29) and the rotor outer disk (30) are fixedly connected to the moving disk connecting active member (31). The stationary shield (4) includes a lower stator side shield (37) surrounding the secondary moving part (32) connected to the moving disk, an upper stator side shield (35) surrounding the lower stator side shield (37), an outer stator side shield (36) that closes the outer side of the lower stator side shield (37) and the outer side of the upper stator side shield (35), a pressurizing shield (38) surrounding the upper stator side shield (35) and the rotating stationary disk (2), and a rotor side stationary shield (39) that closes the side opposite to the pressurizing shield (38) and the outer stator side shield (36). The two ends of the lower stator side cover (37) are connected to the bushing (33) and the stator outer disk (26) respectively; the bushing (33), the lower stator side cover (37) and the stator outer disk (26) form a central air intake chamber (42); the lower stator side cover (37), the stator side outer edge cover (36) and the stator side upper cover (35) form a high-level air intake chamber (43); the outer wall of the rotor-stator disk (2), the pressurizing cover (38), the stator side cover (36), the rotor side stationary cover (39) and the hollow electric spindle (1) form a rim air outlet chamber (44); the outer wall of the rotor inner disk (29) and the inner wall of the rotor outer disk (30) form a receiving hole air outlet chamber (45); The high-level air inlet (19), radial through holes (23), central air inlet (18), receiving hole outlet (20), and wheel rim outlet (21) are provided. The high-level air inlet (19) is located in the circumferential position of the high-level air inlet chamber. After the cold air enters the high-level air inlet chamber (43) through the four radial through holes (23) on the outer edge cover (36) of the stator side, it enters the rotor-stator disk cavity (2) through the high-level air inlet (19). The cold air enters the central air inlet chamber (42) through the central air inlet (18). The receiving hole outlet (20) is located in the inner disk of the rotor (29) and connects the receiving hole outlet cavity (45) and the cavity formed between the inner disk of the rotor (29) and the inner disk of the stator (28). The wheel rim outlet (21) is the gap between the wheel rim of the inner disk of the rotor (29) and the wheel rim of the inner disk of the stator (28). The moving disk connecting active component (31) is provided with a small hole that connects the receiving hole outlet chamber (45) and the interior of the hollow electric spindle (1); part of the air flows into the receiving hole outlet chamber (45) from the receiving hole outlet (20), enters the hollow electric spindle (1) through the radial through hole of the moving disk connecting active component (31), and then flows into the environment; the other part of the air flows out from the rim gap of the rotating stationary disk (2), enters the pressurized shield (38), and then flows into the environment; The rotary acquisition instrument (6) is placed at one end of the hollow electric spindle (1); Temperature measuring points (40) are located on the inner plate of the stator (28) and the outer plate of the rotor (30), and are distributed radially; temperature measuring points (40) are located on the inner plate of the stator (28), and are linearly distributed radially; the rotary acquisition instrument (6), the pressure scanning valve (15), and the multi-channel temperature monitoring instrument (16) are used to collect pressure and temperature signals.

2. The traffic allocation testing system as described in claim 1, characterized in that, It also includes a compressor (9), an air tank (10), a solenoid valve (11), a drying filter (12), a pressure stabilizing box (13), and a mass flow controller (14), which together constitute the air supply and regulation system.

3. The traffic allocation testing system as described in claim 1, characterized in that, It also includes a magnetic fluid seal (5), which is installed on the side of the bearing of the hollow electric spindle (1) and on the secondary moving part (32) of the moving plate connection.

4. The traffic allocation testing system as described in claim 1, characterized in that, Two pressure measuring points (41) are arranged at 180° intervals at the same radius position. There are a total of 12 pressure measuring points (41) on the inner plate of the stator (28) and 2 pressure measuring points (41) on the outer plate of the rotor (30). Temperature measuring points (40) are linearly distributed along the radial direction. Four points are arranged at 90° intervals at the same radius position. There are a total of 60 temperature measuring points (40) on the inner plate of the stator (28). The temperature measuring points of the stator plate are led out from the outer plate of the stator and connected to the multi-channel temperature monitoring instrument (16) to directly read the temperature of the stator plate wall.

5. The traffic allocation testing system as described in claim 1, characterized in that, The maximum speed of the hollow electric spindle (1) is 15,000 rpm.

6. The traffic allocation testing system as described in claim 1, characterized in that, The stator outer disk (26) and rotor inner disk (29) are made of aviation hard aluminum 7075, the stator insulation disk (27) is made of bakelite, and the stator inner disk (28) and rotor inner disk (29) are made of titanium alloy. The stator outer disk (26), stator insulation disk (27), and stator inner disk (28) are provided with 12 axial air inlet holes with a diameter of 10 mm at an average distance of 156 mm from the center line of the shaft. There is an air inlet gap of 5 mm between the bottom and the active part of the auxiliary support (3). The rotor outer disk (30) is made of aviation hard aluminum 7075, and the rotor inner disk (29) is made of titanium alloy. The upper part of the rotor inner disk (29) is provided with 60 axial air outlet holes with a diameter of 10 mm at an average distance of 200 mm from the center line of the shaft.

7. The traffic allocation testing system as described in claim 1, characterized in that, The stator inner disk (28) and the rotor outer disk (30) are provided with air outlet slots at their rims. The axial distance of the air outlet slots varies with the left and right movement of the stator inner disk (28), and the variation range is 1~5mm. There are 4 radial through holes (23) with a diameter of 10mm. There are 4 axial through holes (25) with a diameter of 20mm at 278mm from the center line of the shaft on the rotor side of the pressure shield (38). The axial through holes (25) also penetrate the rotor side shield (39).

8. The traffic allocation testing system as described in claim 1, characterized in that, The temperature measuring point (40) is a thermocouple.

9. A test method using the traffic allocation test system as described in any one of claims 1 to 8, characterized in that, The specific steps are as follows: Step 1: Prepare the stationary plate as the test specimen; Step 2: Debug the rotary data acquisition device to ensure it is working properly and the data is accurate; Step 3: Arrange pressure and temperature measuring points on the rotating plate; Step 4: Build the overall pipeline and test bench, assemble the rotor and stator components on the test bench, connect the pressure measuring line of the outer rotor disc (30) to the rotary acquisition instrument along the axis of the hollow electric spindle, and connect the pressure measuring line and temperature measuring line of the inner stator disc (28) to the pressure scanning valve multi-channel temperature monitoring instrument respectively. Step 5: Air tightness test. Connect the calibrated measuring instruments and pipelines, and reinforce the seal at the interface by installing rubber gaskets and sealant. Use an air compressor as the air source for air supply and testing. Step 6: Determine the test conditions, start the rotary data acquisition instrument, and begin recording temperature and heat flow signals; Step 7: Turn on the compressor to start supplying air, open the exhaust bypass to prevent excessive pressure in the pipeline, and at the same time monitor the flow rates at the center inlet, high-level inlet, receiving hole outlet, and wheel rim outlet; Step 8: Start the water chiller to provide cooling for the electric spindle; Step 9: Start the rotating electric spindle and adjust the speed to reach the target speed; Step 10: During the test, the test pressure and temperature signals are read through the data acquisition system. After the test, the friction loss coefficient along the radial direction of the rotating and stationary disk cavity is calculated and analyzed. The calculation process is as follows: ， In the formula, The absolute static pressure measured at the pressure measuring point on the inner plate (28) of the stator; The absolute static pressure measured on the outer disk (30) of the rotor; The incoming flow density is calculated by a combination of temperature monitoring instrument, rotating data acquisition instrument and thermocouple; b is the angular velocity of the turntable, a value manually set by the frequency converter; b is the highest radius inside the inner disk (29) cavity of the rotor. The process of calculating traffic share is as follows: ， ， ， ， In the formula, Indicates the central import flow. This indicates a high level of import flow. Indicates the flow rate at the outlet of the receiving port. This indicates the flow rate at the rim outlet.

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