Fuel cell scroll air compressor test system and method

Abstract

The invention provides a fuel cell scroll air compressor test system and method. The testing system comprises an air filter, an air compressor inlet pressure sensor, an air compressor inlet temperature sensor, a tested vortex air compressor, an air compressor outlet pressure sensor, an air compressor outlet temperature sensor, an air compressor outlet first flow sensor, an air compressor outlet first back pressure valve and an air compressor outlet second flow sensor. The system comprises a first back pressure valve, an air compressor outlet second back pressure valve, an air compressor cooling flow channel outlet temperature sensor, a cooling water tank, an electromagnetic valve, a circulating water pump, a cooling liquid flow sensor and an air-cooled radiator. The test content developed by the test system comprises: (1) rated flow test; (2) testing the highest compression ratio; (3) testing the highest isentropic efficiency of a common working condition; and (4) testing outlet pressure fluctuation deviation. According to the testing system and method, the vortex air compressor can be accurately tested, and the performance of the vortex air compressor can be optimized according to the testing result.

Description

Technical Field

[0001] The invention relates to the technical field of fuel cells, and in particular to a fuel cell vortex air compressor testing system and method. Background Art

[0002] Against the backdrop of increasingly severe global environmental problems and energy transformation, the new energy vehicle industry is booming at an unprecedented rate, among which hydrogen fuel cell vehicles have become a hot area of ​​research and application due to their efficient and clean energy conversion method. As the core power unit of hydrogen fuel cell vehicles, the stable operation of the hydrogen fuel cell system plays a decisive role in the performance and reliability of the vehicle. In the fuel cell system, the air compressor shoulders the key mission of providing sufficient and suitable air for the electrochemical reaction, and its performance directly affects the power generation efficiency, output power and overall life of the fuel cell.

[0003] Scroll air compressors have received extensive attention and application in the field of fuel cell vehicles due to their unique structural advantages, such as compact structure, small size, light weight, smooth operation, and low noise. However, despite the many advantages of scroll air compressors in practical applications, the precise testing technology that matches them is relatively backward and cannot meet the needs of the rapid development of the industry.

[0004] Therefore, it is necessary to rationally design a test system and method that can comprehensively test the comprehensive performance of fuel cell scroll air compressors, such as performance, noise, and life, in order to ensure the high-quality application of air compressors and promote the development of the fuel cell vehicle industry. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a fuel cell scroll air compressor testing system and method, which can accurately test the scroll air compressor and optimize the performance of the scroll air compressor based on the test results.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a fuel cell scroll air compressor test system, comprising an air filter, an air compressor inlet pressure sensor, an air compressor inlet temperature sensor, a scroll air compressor to be tested, an air compressor outlet pressure sensor, an air compressor outlet temperature sensor, an air compressor outlet first flow sensor, an air compressor outlet first back pressure valve, an air compressor outlet second flow sensor, an air compressor outlet second back pressure valve, an air compressor cooling channel outlet temperature sensor, a cooling water tank, a solenoid valve, a circulating water pump, a coolant flow sensor and an air-cooled radiator; the test contents carried out by the test system include (1) rated flow test; (2) maximum compression ratio test; (3) maximum isentropic efficiency test under common working conditions; and (4) outlet pressure fluctuation deviation test.

[0007] In a preferred embodiment, the air compressor inlet pressure sensor and the air compressor inlet temperature sensor are arranged behind the air filter to monitor the intake state of the scroll air compressor; the air compressor outlet pressure sensor and the air compressor outlet temperature sensor are used to monitor the exhaust state of the scroll air compressor, and the sampling frequency of the air compressor outlet pressure sensor for the outlet pressure fluctuation deviation test is 1kHz; the air compressor outlet first flow sensor, the air compressor outlet first back pressure valve, the air compressor outlet second flow sensor, and the air compressor outlet second back pressure valve are respectively arranged in the parallel flow channel behind the air compressor outlet pressure sensor and the air compressor outlet temperature sensor; the air compressor outlet first flow sensor is used to detect the outlet flow of a large-flow scroll air compressor, and the air compressor outlet second flow sensor is used to detect the outlet flow of a small-flow scroll air compressor.

[0008] In a preferred embodiment, the air compressor cooling channel outlet temperature sensor, cooling water tank, solenoid valve, circulating water pump, coolant flow sensor, and air-cooled radiator are connected in sequence, and the measured scroll air compressor cooling channel outlet temperature sensor is used to monitor the internal temperature of the air compressor.

[0009] In a preferred embodiment, air enters the measured scroll air compressor after passing through the air filter, the air compressor inlet pressure sensor and the air compressor inlet temperature sensor. After being compressed, the air is discharged from the air compressor exhaust pipe and flows through the air compressor outlet temperature sensor and the air compressor outlet pressure sensor. For large-flow air compressors, the first back-pressure valve at the air compressor outlet is used to adjust the back pressure, and the second back-pressure valve at the air compressor outlet is normally closed. For small-flow air compressors, the second back-pressure valve at the air compressor outlet is used to adjust the back pressure, and the first pressure-end back-pressure valve at the air compressor outlet is normally closed. Finally, the air flows out of the back-pressure valve and is discharged into the atmosphere.

[0010] The present invention also provides a fuel cell scroll air compressor testing method, which adopts the above-mentioned fuel cell scroll air compressor testing system, including 1) a rated flow testing method, 2) a maximum compression ratio testing method, 3) a maximum isentropic efficiency testing method under common working conditions, and 4) an outlet pressure fluctuation deviation testing method.

[0011] In a preferred embodiment, referring to the power output curve of the fuel cell based on the Chinese working conditions in the draft for comments of the national standard "Durability Test Method for Fuel Cell Engines and Key Components", the fuel cell engine is combined with the fuel cell engine to perform a durability cycle test according to the fuel cell engine cycle operating curve, and the speed change of the scroll air compressor carried thereon is recorded to form a scroll air compressor rated speed ratio cycle:

[0012]

[0013] The rated speed ratio cycle condition is defined as the normal operating condition.

[0014] In a preferred embodiment, the test steps for the rated flow of the scroll air compressor are as follows:

[0015] S11: Install the scroll air compressor to be tested on the test system, and set the coolant flow and temperature according to the requirements of the product technical documents;

[0016] S12: Load the scroll air compressor to the rated working condition, make the speed deviation of the scroll air compressor not exceed ±20r / min, and run stably for n1 minutes, n1≥10;

[0017] S13: An outlet flow sensor is used to monitor the outlet flow of the scroll air compressor. The final test result of the rated flow of the scroll air compressor is the average value of the rated flow of the scroll air compressor that operates stably during the test period.

[0018] In a preferred embodiment, the test of the maximum compression ratio of the scroll air compressor refers to Article H.2.1 of Appendix H of GB / T3853-2017, and the total gas pressure at the outlet of the scroll air compressor and the total gas pressure at the inlet of the scroll air compressor are measured by the air compressor outlet pressure sensor and the inlet pressure sensor, and the maximum compression ratio of the scroll air compressor is calculated to be:

[0019]

[0020] In the formula, ε max is the maximum compression ratio of the scroll compressor, P max is the maximum outlet pressure of the scroll air compressor, and P0 is the inlet pressure of the scroll air compressor.

[0021] In a preferred embodiment, the test steps for the highest isentropic efficiency of a scroll air compressor under common working conditions are as follows:

[0022] S21: After the scroll air compressor to be tested is installed on the test system, the scroll air compressor is operated stably under normal working conditions for n2 minutes, where n2 ≥ 30;

[0023] S22: After the test is completed, measure and record the following parameters, with a data recording period of n3 seconds, n3≤0.5: 1) Ambient pressure and ambient temperature during the test; 2) Total pressure of air compressor inlet gas; 3) Total temperature of air compressor inlet gas; 4) Air compressor gas flow; 5) Total pressure of air compressor outlet gas; 6) Total temperature of air compressor outlet gas; 7) Air compressor speed; 8) Motor input power;

[0024] S23: The isentropic power of the scroll compressor is calculated based on the data obtained from the test:

[0025]

[0026] Where: P sis the isentropic power; κ is the isentropic index; R is the gas constant; p p is the total pressure of the air compressor outlet gas; p x is the total pressure of the air compressor inlet gas; T x is the total temperature of the air compressor inlet gas; q m is the gas flow rate of the air compressor;

[0027] The shaft power of the scroll compressor is calculated using the motor efficiency characteristics and the measured input power:

[0028] P z =P dz η c (4)

[0029] Where P z is the air compressor shaft power; P dz is the motor input power; η c is the transmission efficiency of the motor;

[0030] Finally, the highest isentropic efficiency η of the scroll air compressor under common working conditions is calculated. t for:

[0031]

[0032] In a preferred embodiment, the test steps for the outlet pressure fluctuation deviation of the scroll air compressor are as follows:

[0033] S31. Run the scroll air compressor to the rated working point, check that there is no leakage of air, liquid or electricity at each connection part, and there is no abnormal sound during the operation of the scroll air compressor. After it stabilizes, fix the throttle opening of the scroll air compressor outlet;

[0034] S32, turning on the pressure sensor switch, adjusting the speed and flow of the scroll air compressor to the values ​​calibrated under the rated working conditions; after the scroll air compressor is running stably, continuously collecting several groups of scroll air compressor outlet pressure values ​​within one cycle of the scroll air compressor operation;

[0035] S33. Based on the pressure test data recorded in the test, calculate the maximum deviation Δp of the outlet pressure fluctuation of the scroll air compressor during the test period. max :

[0036] Δp max =max(|p i -p|),i=1,2,3,…,n (6)

[0037] In the formula, p i is the collected value of the air compressor outlet pressure, and p is the average value of the air compressor outlet pressure during the test period.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The test system and method designed in the present invention can comprehensively test the comprehensive performance of the fuel cell scroll air compressor, and provide data basis for the design, optimization and application of the scroll air compressor. At the same time, the overall system has a simple structure, convenient operation, strong practicality and is easy to promote.

[0040] The test system designed by the present invention adopts a dual-flow channel parallel form. A large flow meter flow channel is used for a large-flow air compressor, and a small flow meter flow channel is used for a small-flow air compressor. The dual-flow channel parallel design enables the test system to have a wider flow test range, which can meet the testing requirements of air compressors of various power levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a system block diagram of an embodiment of the present invention;

[0042] Figure 2 It is a common working condition of the embodiment of the present invention, the horizontal axis is time, and the vertical axis is the proportion of the rated speed of the scroll air compressor;

[0043] In the figure: 1-air filter, 2-air compressor inlet pressure sensor, 3-air compressor inlet temperature sensor, 4-air compressor intake pipe, 5-vortex air compressor, 6-air compressor drive motor, 7-air-cooled radiator, 8-air compressor cooling channel outlet temperature sensor, 9-coolant flow sensor, 10-circulating water pump, 11-solenoid valve, 12-cooling water tank, 13-air compressor outlet first back pressure valve, 14-air compressor outlet second back pressure valve, 15-air compressor outlet second flow sensor, 16-air compressor outlet first flow sensor, 17-air compressor outlet pressure sensor, 18-air compressor outlet temperature sensor, 19-air compressor exhaust pipe. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application; as used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0047] like Figure 1 As shown, the test system comprises an air filter 1, an air compressor inlet pressure sensor 2, an air compressor inlet temperature sensor 3, a tested scroll air compressor 4, an air compressor outlet pressure sensor 17, an air compressor outlet temperature sensor 18, an air compressor outlet first flow sensor 16, an air compressor outlet first back pressure valve 13, an air compressor outlet second flow sensor 15, an air compressor outlet second back pressure valve 14, an air compressor cooling channel outlet temperature sensor 8, a cooling water tank 12, a solenoid valve 11, a circulating water pump 10, a coolant flow sensor 9, and an air-cooled radiator 7. The test contents carried out by the test system include (1) rated flow test; (2) maximum compression ratio test; (3) maximum isentropic efficiency test under common working conditions; and (4) outlet pressure fluctuation deviation test.

[0048] The inlet pressure sensor 2 and the inlet temperature sensor 3 are arranged behind the air filter 1 to monitor the intake state of the scroll air compressor. The air compressor outlet pressure sensor 17 and the air compressor outlet temperature sensor 18 are used to monitor the exhaust state of the scroll air compressor. The sampling frequency of the air compressor outlet pressure sensor 18 for the outlet pressure fluctuation deviation test is 1kHz; the air compressor outlet first flow sensor 16, the air compressor outlet first back pressure valve 13, the air compressor outlet second flow sensor 15, and the air compressor outlet second back pressure valve 14 are respectively arranged in the parallel flow channel behind the air compressor outlet pressure sensor 17 and the air compressor outlet temperature sensor 18. The air compressor outlet first flow sensor 16 is used to detect the outlet flow of the large flow scroll air compressor, and the air compressor outlet second flow sensor 15 is used to detect the outlet flow of the small flow scroll air compressor.

[0049] The cooling channel outlet temperature sensor 8, cooling water tank 12, solenoid valve 11, circulating water pump 10, coolant flow sensor 9, and air-cooled radiator 7 of the measured scroll air compressor are connected in sequence. The cooling channel outlet temperature sensor 8 of the measured scroll air compressor is used to monitor the internal temperature of the air compressor.

[0050] The air passes through the air filter 1, the air compressor inlet pressure sensor 2 and the air compressor inlet temperature sensor 3 and then enters the measured scroll air compressor 5. After being compressed, the air is discharged from the air compressor exhaust pipe 19 and flows through the air compressor outlet temperature sensor 18 and the air compressor outlet pressure sensor 17. For large-flow air compressors, the first back pressure valve 13 at the air compressor outlet is used to adjust the back pressure, and the second back pressure valve 14 at the air compressor outlet is normally closed. For small-flow air compressors, the second back pressure valve 14 at the air compressor outlet is used to adjust the back pressure, and the first pressure end back pressure valve 13 at the air compressor outlet is normally closed. Finally, the air flows out of the back pressure valve and is discharged into the atmosphere.

[0051] Referring to the power output curve of the fuel cell based on Chinese working conditions in the draft for comments of the national standard "Durability Test Method for Fuel Cell Engines and Key Components", the durability cycle test is carried out in combination with the fuel cell engine according to the fuel cell engine cycle operating curve, and the speed change of the scroll air compressor carried by it is recorded to form the scroll air compressor rated speed proportion cycle:

[0052]

[0053] Where, X is the percentage of the rated speed of the scroll compressor, n cp is the speed change of the scroll compressor, n rated It is the rated speed of the scroll air compressor.

[0054] The rated speed ratio cycle condition is defined as the normal operating condition.

[0055] The test steps for the rated flow of the scroll air compressor are as follows:

[0056] S11: Install the scroll air compressor to be tested on the test system. The installation method shall comply with the provisions of the product technical documents, and the coolant flow rate and temperature shall be set according to the requirements of the product technical documents;

[0057] S12: Load the scroll air compressor to the rated working condition, make the speed deviation of the scroll air compressor not exceed ±20r / min, and run stably for n1 minutes (n1≥10 is recommended);

[0058] S13: An outlet flow sensor is used to monitor the outlet flow of the scroll air compressor. The final test result of the rated flow of the scroll air compressor is the average value of the rated flow of the scroll air compressor that operates stably during the test period.

[0059] For the test of the maximum compression ratio of the scroll air compressor, refer to Article H.2.1 of Appendix H of GB / T 3853-2017. The total gas pressure at the outlet of the scroll air compressor and the total gas pressure at the inlet of the scroll air compressor are measured by the air compressor outlet pressure sensor and the inlet pressure sensor. The maximum compression ratio of the scroll air compressor is calculated as follows:

[0060]

[0061] In the formula, ε max is the maximum compression ratio of the scroll compressor, P max is the maximum outlet pressure of the scroll air compressor, and P0 is the inlet pressure of the scroll air compressor.

[0062] The test steps for the highest isentropic efficiency of scroll compressors under common working conditions are as follows:

[0063] S21: After installing the scroll air compressor to be tested on the test system, run the scroll air compressor stably under normal working conditions for n2 minutes (n2 ≥ 30 is recommended);

[0064] S22: After the test is completed, measure and record the following parameters. The data recording period is n3 seconds (n3 ≤ 0.5 is recommended): (1) Ambient pressure and ambient temperature during the test; (2) Total pressure of air compressor inlet gas; (3) Total temperature of air compressor inlet gas; (4) Air compressor gas flow rate; (5) Total pressure of air compressor outlet gas; (6) Total temperature of air compressor outlet gas; (7) Air compressor speed; (8) Motor input power;

[0065] S23: The isentropic power of the scroll compressor is calculated based on the data obtained from the test:

[0066]

[0067] Where: P s is the isentropic power; κ is the isentropic index; R is the gas constant; p p is the total pressure of the air compressor outlet gas; p x is the total pressure of the air compressor inlet gas; T x is the total temperature of the air compressor inlet gas; q m is the gas flow rate of the air compressor;

[0068] The shaft power of the scroll compressor is calculated using the motor efficiency characteristics and the measured input power:

[0069] P z =P dz η c (4)

[0070] Where P z is the air compressor shaft power; P dz is the motor input power; η c is the transmission efficiency of the motor.

[0071] Finally, the maximum isentropic efficiency η of the scroll compressor under common working conditions can be calculated t for:

[0072]

[0073] The test steps for the outlet pressure fluctuation deviation of the scroll air compressor are as follows:

[0074] S31. Run the scroll air compressor to the rated working point, check that there is no leakage of air, liquid or electricity at each connection part, and there is no abnormal sound during the operation of the scroll air compressor. After it stabilizes, fix the throttle opening of the scroll air compressor outlet;

[0075] S32, turn on the pressure sensor switch, and adjust the speed and flow rate of the scroll air compressor to the values ​​calibrated under the rated working conditions. After the scroll air compressor runs stably, continuously collect several groups of scroll air compressor outlet pressure values ​​within one cycle of the scroll air compressor operation.

[0076] S33. Based on the pressure test data recorded in the test, calculate the maximum deviation Δp of the outlet pressure fluctuation of the scroll air compressor during the test period. max :

[0077] Δp max =max(|p i -p|),i=1,2,3,…,n (6)

[0078] In the formula, p i is the collected value of the air compressor outlet pressure, and p is the average value of the air compressor outlet pressure during the test period.

[0079] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A fuel cell scroll air compressor test system, characterized in that: The test system comprises an air filter, an air compressor inlet pressure sensor, an air compressor inlet temperature sensor, a scroll air compressor to be tested, an air compressor outlet pressure sensor, an air compressor outlet temperature sensor, an air compressor outlet first flow sensor, an air compressor outlet first back pressure valve, an air compressor outlet second flow sensor, an air compressor outlet second back pressure valve, an air compressor cooling channel outlet temperature sensor, a cooling water tank, a solenoid valve, a circulating water pump, a coolant flow sensor and an air-cooled radiator; the test contents carried out by the test system include (1) rated flow test; (2) maximum compression ratio test; (3) maximum isentropic efficiency test under common working conditions; and (4) outlet pressure fluctuation deviation test.

2. A fuel cell scroll air compressor test system according to claim 1, characterized in that: The air compressor inlet pressure sensor and the air compressor inlet temperature sensor are arranged behind the air filter to monitor the intake state of the scroll air compressor; the air compressor outlet pressure sensor and the air compressor outlet temperature sensor are used to monitor the exhaust state of the scroll air compressor, and the sampling frequency of the air compressor outlet pressure sensor for the outlet pressure fluctuation deviation test is 1kHz; the air compressor outlet first flow sensor, the air compressor outlet first back pressure valve, the air compressor outlet second flow sensor, and the air compressor outlet second back pressure valve are respectively arranged in the parallel flow channel behind the air compressor outlet pressure sensor and the air compressor outlet temperature sensor; the air compressor outlet first flow sensor is used to detect the outlet flow of the large-flow scroll air compressor, and the air compressor outlet second flow sensor is used to detect the outlet flow of the small-flow scroll air compressor.

3. A fuel cell scroll air compressor test system according to claim 1, characterized in that: The outlet temperature sensor of the cooling channel of the air compressor, the cooling water tank, the solenoid valve, the circulating water pump, the coolant flow sensor, and the air-cooled radiator are connected in sequence. The outlet temperature sensor of the cooling channel of the measured scroll air compressor is used to monitor the internal temperature of the air compressor.

4. A fuel cell scroll air compressor test system according to claim 1, characterized in that: The air passes through the air filter, the air compressor inlet pressure sensor and the air compressor inlet temperature sensor before entering the measured scroll air compressor. After being compressed, the air is discharged from the air compressor exhaust pipe and flows through the air compressor outlet temperature sensor and the air compressor outlet pressure sensor. For large-flow air compressors, the first back-pressure valve at the air compressor outlet is used to adjust the back pressure, and the second back-pressure valve at the air compressor outlet is normally closed. For small-flow air compressors, the second back-pressure valve at the air compressor outlet is used to adjust the back pressure, and the first pressure-end back-pressure valve at the air compressor outlet is normally closed. Finally, the air flows out of the back-pressure valve and is discharged into the atmosphere.

5. A fuel cell scroll air compressor testing method, characterized in that: A fuel cell vortex air compressor test system as described in any one of claims 1 to 4 above is adopted, including 1) a rated flow test method, 2) a maximum compression ratio test method, 3) a maximum isentropic efficiency test method under common operating conditions, and 4) an outlet pressure fluctuation deviation test method.

6. A fuel cell scroll air compressor testing method according to claim 5, characterized in that: Referring to the power output curve of the fuel cell based on Chinese working conditions in the draft for comments of the national standard "Durability Test Method for Fuel Cell Engines and Key Components", the durability cycle test is carried out in combination with the fuel cell engine according to the fuel cell engine cycle operating curve, and the speed change of the scroll air compressor carried by it is recorded to form the scroll air compressor rated speed proportion cycle: Where, X is the percentage of the rated speed of the scroll compressor, n cp is the speed change of the scroll compressor, n rated is the rated speed of the scroll air compressor; the cycle condition that takes up this rated speed is defined as the common operating condition.

7. A fuel cell scroll air compressor testing method according to claim 5, characterized in that ,,The test steps for the rated flow of the scroll air compressor are as follows: S11: Install the scroll air compressor to be tested on the test system, and set the coolant flow and temperature according to the requirements of the product technical documents; S12: Load the scroll air compressor to the rated working condition, make the speed deviation of the scroll air compressor not exceed ±20r / min, and run stably for n1 minutes, n1≥10; S13: An outlet flow sensor is used to monitor the outlet flow of the scroll air compressor. The final test result of the rated flow of the scroll air compressor is the average value of the rated flow of the scroll air compressor that operates stably during the test period.

8. A fuel cell scroll air compressor testing method according to claim 5, characterized in that: For the test of the maximum compression ratio of the scroll air compressor, refer to Article H.2.1 of Appendix H of GB / T 3853-2017. The total gas pressure at the outlet of the scroll air compressor and the total gas pressure at the inlet of the scroll air compressor are measured by the air compressor outlet pressure sensor and the inlet pressure sensor. The maximum compression ratio of the scroll air compressor is calculated as follows: In the formula, ε max is the maximum compression ratio of the scroll compressor, P max is the maximum outlet pressure of the scroll air compressor, and P0 is the inlet pressure of the scroll air compressor.

9. A fuel cell scroll air compressor testing method according to claim 5, characterized in that: The test steps for the highest isentropic efficiency of scroll compressors under common working conditions are as follows: S21: After the scroll air compressor to be tested is installed on the test system, the scroll air compressor is operated stably under normal working conditions for n2 minutes, where n2 ≥ 30; S22: After the test is completed, measure and record the following parameters, with a data recording period of n3 seconds, n3≤0.5: 1) Ambient pressure and ambient temperature during the test; 2) Total pressure of air compressor inlet gas; 3) Total temperature of air compressor inlet gas; 4) Air compressor gas flow; 5) Total pressure of air compressor outlet gas; 6) Total temperature of air compressor outlet gas; 7) Air compressor speed; 8) Motor input power; S23: The isentropic power of the scroll compressor is calculated based on the data obtained from the test: Where: P s is the isentropic power; κ is the isentropic index; R is the gas constant; p p is the total pressure of the air compressor outlet gas; p x is the total pressure of the air compressor inlet gas; T x is the total temperature of the air compressor inlet gas; q m is the gas flow rate of the air compressor; The shaft power of the scroll compressor is calculated using the motor efficiency characteristics and the measured input power: P.S z JP dz η c (4) Where P z is the air compressor shaft power; P dz Input power to the motor; η c is the transmission efficiency of the motor; Finally, the highest isentropic efficiency η of the scroll air compressor under common working conditions is calculated. t for:

10. A fuel cell scroll air compressor testing method according to claim 5, characterized in that: The test steps for the outlet pressure fluctuation deviation of the scroll air compressor are as follows: S31. Run the scroll air compressor to the rated working point, check that there is no leakage of air, liquid or electricity at each connection part, and there is no abnormal sound during the operation of the scroll air compressor. After it stabilizes, fix the throttle opening of the scroll air compressor outlet; S32, turning on the pressure sensor switch, adjusting the speed and flow of the scroll air compressor to the values ​​calibrated under the rated working conditions; after the scroll air compressor is running stably, continuously collecting several groups of scroll air compressor outlet pressure values ​​within one cycle of the scroll air compressor operation; S33. Based on the pressure test data recorded in the test, calculate the maximum deviation Δp of the outlet pressure fluctuation of the scroll air compressor during the test period. max : Δp max =max(|p i -p|),i=1,2,3,…,n (6) In the formula, p i is the collected value of the air compressor outlet pressure, and p is the average value of the air compressor outlet pressure during the test period.

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