Onboard fan product performance test bench

Abstract

The application relates to the technical field of fan performance test, in particular to an airborne fan product performance test bench, wherein an adjusting valve is connected with a circulating pipeline; an upstream static pressure sensor and a downstream static pressure sensor are respectively arranged on the two sides of a mounting position; a total pressure sensor is arranged downstream of the mounting position; a downstream temperature sensor is arranged downstream of the mounting position and opposite to the downstream static pressure sensor; a control and display cabinet is connected with the upstream static pressure sensor, the downstream static pressure sensor, the total pressure sensor and the downstream temperature sensor; the volume flow of a tested fan is obtained according to the inner diameter of the circulating pipeline, the total pressure in the circulating pipeline, the upstream and downstream static pressures of the tested fan and the static temperature at the test section where the downstream static pressure sensor is located; a fitting curve of the pressure difference and the volume flow of the tested fan under the current environment is fitted according to the corresponding relationship between the pressure difference and the volume flow of multiple groups, the aerodynamic performance of the fan can be effectively evaluated, and the design is optimized and the working efficiency of the fan is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan performance test, in particular to an airborne fan product performance test bench. BACKGROUND

[0002] At present, the fan used for ventilation or heat dissipation on the aircraft is mainly an axial flow fan. With the design of system and aircraft weight reduction and compact structure, the pipe diameter gradually becomes smaller, resulting in greater system pipe resistance and higher pressure rise requirement of the fan. The ordinary axial flow fan cannot meet the requirement. The mixed flow fan has the characteristics of compact structure and high pressure rise, and has been widely used on the aircraft. With the development of technology, the airborne product has a higher requirement for efficiency. The high-efficiency product can reduce energy consumption, reduce the flight cost of the aircraft and increase the endurance mileage. Therefore, it is very critical to improve the working efficiency of the airborne fan.

[0003] An existing fan performance test system is composed of an upstream ultrasonic transducer, a downstream ultrasonic transducer, a static pressure gauge, a multi-leaf valve and an auxiliary fan. The main structure includes a contraction section, a measurement section and a diffusion section. The contraction section is used for installing the fan to be tested, and the upstream and downstream ultrasonic transducers are installed at 45 degrees on both sides of the measurement section to measure the wind speed of the fan by using the ultrasonic time difference method. The pressure gauge is installed above the opening of the measurement section to measure the static pressure of the fan. By adjusting the opening angle of the multi-leaf valve and the power of the auxiliary fan, the system can realize the test and evaluation of the fan under different working conditions. When the fan is running, the pressure difference between the upstream and downstream of the fan is inevitably caused, thereby affecting the airflow flow rate driven by the fan. Therefore, in addition to the pressure test of the fan under different working conditions, the aerodynamic performance of the fan also needs to be effectively evaluated. SUMMARY

[0004] In order to solve the above problems, the present application provides an airborne fan product performance test bench.

[0005] The airborne fan product performance test bench provided by the present application adopts the following technical scheme:

[0006] An airborne fan product performance test bench comprises:

[0007] A circulating pipe is connected with an adjusting valve, and an installation position of a fan to be tested is arranged in the circulating pipe;

[0008] An upstream static pressure sensor and a downstream static pressure sensor are arranged on both sides of the installation position respectively, and are used for measuring the static pressure of the upstream and downstream of the fan to be tested. The difference between the static pressures of the upstream and downstream of the fan to be tested is a pressure difference;

[0009] A total pressure sensor is arranged downstream of the installation position and is used for measuring the total pressure in the circulating pipe.

[0010] a downstream temperature sensor arranged downstream of the mounting position and opposite to the downstream static pressure sensor, for measuring the static temperature at the test section where the downstream static pressure sensor is arranged;

[0011] a control and display cabinet connected with the upstream static pressure sensor, the downstream static pressure sensor, the total pressure sensor, and the downstream temperature sensor; for deriving the volume flow rate of the test fan according to the inner diameter of the circulating pipeline, the total pressure in the circulating pipeline, the static pressures upstream and downstream of the test fan, and the static temperature at the test section where the downstream static pressure sensor is arranged; and for fitting a fitting curve of the pressure difference and the volume flow rate of the test fan under the current environment according to a plurality of corresponding relationships between the pressure difference and the volume flow rate.

[0012] By adopting the above technical solutions, the static pressures upstream and downstream of the fan, the total pressure in the circulating pipeline, and the static temperature downstream are accurately measured and controlled, the volume flow rate of the test fan can be accurately calculated, and the performance curve of the fan under a specific environment can be fitted according to a plurality of corresponding relationships between the pressure difference and the volume flow rate, which not only improves the accuracy and reliability of the test, but also comprehensively evaluates the performance changes of the fan under different working conditions, thereby optimizing the design and improving the working efficiency of the fan.

[0013] Optionally, the control and display cabinet is further configured to be connected with the test fan, change the rotating speed of the test fan, and fit a fitting curve family of the pressure difference and the volume flow rate of the test fan under different rotating speed working conditions according to corresponding relationships between the pressure difference and the volume flow rate under different rotating speed working conditions.

[0014] By adopting the above technical solutions, the rotating speed of the test fan is changed, and a fitting curve family of the pressure difference and the volume flow rate is fitted according to corresponding relationships between the pressure difference and the volume flow rate under different rotating speed working conditions, which can comprehensively evaluate and optimize the performance of the fan. The performance test based on the rotating speed change can provide important data support for the design and improvement of the fan, help better understand the performance characteristics of the fan at different working points, and further optimize the fan design and improve the efficiency and reliability of the fan in actual application.

[0015] Optionally, the circulating pipeline is provided with an air outlet and an air inlet, and the system further comprises:

[0016] a vacuum pump in communication with the air outlet through an air outlet pipe, for extracting the gas in the circulating pipeline;

[0017] a gas supplement pipe in communication with the air inlet, and the gas supplement pipe is provided with a gas supplement valve.

[0018] By adopting the above technical scheme, the vacuum pump is communicated with the gas outlet through the gas outlet pipe to extract the gas in the circulating pipeline, thereby reducing the gas pressure in the pipeline to simulate different working heights and environmental conditions. The air supplement pipe is communicated with the gas inlet and is provided with an air supplement valve, which can supplement the gas in the circulating pipeline when needed to adjust the gas pressure and density in the pipeline. In this way, the test bench can more realistically reproduce various environmental conditions that the fan may encounter in actual work, thereby providing strong support for performance testing and optimization of the fan.

[0019] Optionally, a heater is arranged on the circulating pipeline.

[0020] By adopting the above technical scheme, the heater directly heats the gas in the circulating pipeline to quickly raise the temperature and maintain a constant temperature, thereby accurately controlling the temperature in the circulating pipeline and simulating various temperature conditions that the fan may encounter in actual work, thereby providing strong support for performance testing and optimization of the fan.

[0021] Optionally, a refrigeration subsystem is further included, which comprises an evaporator, an electronic expansion valve, a condenser and a compressor connected in communication, and the evaporator is connected to the circulating pipeline.

[0022] By adopting the above technical scheme, the refrigeration subsystem directly cools the gas in the circulating pipeline to quickly lower the temperature and maintain a constant temperature, thereby accurately controlling the temperature in the circulating pipeline and simulating various temperature conditions that the fan may encounter in actual work, thereby providing strong support for performance testing and optimization of the fan.

[0023] Optionally, a sealed tank is further included, which comprises a tank body and a partition fixed in the tank body, and the partition is communicated with the inside and outside of the tank body to form the circulating pipeline in the tank body.

[0024] By adopting the above technical scheme, the design of the sealed tank ensures the sealing of the circulating pipeline to prevent gas leakage, which is crucial for maintaining a stable test environment in the pipeline. The sealed tank has a simple and reasonable structure, is easy to process, has high production efficiency, good sealing effect and is firm and durable. Secondly, the partition is arranged to form a closed loop of the circulating pipeline in the tank body, which helps to achieve uniform distribution and circulation of the gas flow, thereby ensuring the stability and repeatability of the gas flow during the test. In this way, not only the safety and reliability of the test bench are improved, but also the accurate control of the fan performance test is achieved, thereby providing a stable and controllable test environment for performance evaluation of the fan under different working conditions.

[0025] Optionally, the partition is a partition pipe with open ends and is arranged in the middle of the tank body, and the partition pipe is provided with a mounting position of the test fan.

[0026] By adopting the technical scheme, the partition pipe is arranged in the middle of the tank body and has two open ends, so that the internal space of the tank body can be effectively divided into two independent airflow channels, a stable airflow circulation is formed in the circulating pipeline, and a uniform test environment is provided for the fan. In addition, the test fan is installed in the partition pipe, so that the fan can be directly affected by the circulating airflow, and the test result is more accurate and reliable.

[0027] Optionally, an upstream temperature sensor is arranged upstream of the installation position and used for measuring the static temperature upstream of the installation position. The control and display cabinet is connected with the upstream temperature sensor and used for obtaining the temperature rise of the test fan under different pressure differences and flow rates according to the static temperatures upstream and downstream of the installation position.

[0028] By adopting the technical scheme, the upstream temperature sensor is arranged upstream of the installation position and connected with the control and display cabinet, so that the static temperature upstream of the test fan can be accurately measured, which is crucial for evaluating the performance of the fan under different working conditions. By comparing the static temperatures upstream and downstream, the temperature rise of the fan can be accurately calculated, so that the thermal performance of the fan under different pressure differences and flow rates can be evaluated.

[0029] Optionally, an ammeter and a voltmeter are arranged for electrically connecting with the test fan, and the ammeter and the voltmeter are used for measuring the current and voltage of the test fan. The control and display cabinet is connected with the ammeter and the voltmeter and used for obtaining the efficiency curve of the test fan according to the current and voltage of the test fan, the pressure difference and the flow rate of the test fan.

[0030] By adopting the technical scheme, the ammeter and the voltmeter are arranged in the test system to measure the current and voltage of the test fan, and the data are connected with the control and display cabinet, so that the efficiency of the fan can be accurately evaluated.

[0031] In summary, the present application has at least one of the following beneficial technical effects:

[0032] 1. According to the inner diameter of the circulating pipeline, the total pressure in the circulating pipeline, the static pressures upstream and downstream of the test fan, and the static temperature at the test section where the downstream static pressure sensor is located, the volumetric flow rate of the test fan is obtained. According to the corresponding relationship between the pressure difference and the volumetric flow rate, a fitting curve of the pressure difference and the volumetric flow rate of the test fan under the current environment is fitted, so that the aerodynamic performance of the fan can be effectively evaluated, thereby optimizing the design and improving the working efficiency of the fan.

[0033] 2. The rotational speed of the test fan is changed, and a fitting curve family of the pressure difference and the volumetric flow rate of the test fan under different rotational speed working conditions in the current environment is fitted according to the corresponding relationship between the pressure difference and the volumetric flow rate under different rotational speed working conditions, so that the overall evaluation and optimization of the fan performance based on the change of the rotational speed can be realized, and important data support is provided for the design and improvement of the fan.

[0034] 3. The circulating pipeline is provided with a heater and a refrigeration subsystem, which can simulate various temperature conditions that the fan may encounter in actual work, and the temperature simulation range is -55℃-95℃, which provides strong support for performance test and optimization of the fan;

[0035] 4. The circulating pipeline is connected with a vacuum pump and a gas supplement pipeline, which can simulate different working heights and environmental conditions, and according to the different limit suction speeds of the vacuum pump, the maximum simulation height can reach 20km. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a structural schematic diagram of an airborne fan product performance test bench in the embodiment of the present application;

[0037] Figure 2 is a structural schematic diagram of a tank body in the embodiment of the present application.

[0038] BRIEF DESCRIPTION OF DRAWINGS

[0039] 100, test fan;

[0040] 11, circulating pipeline; 111, tank body; 111a, upper tank body; 111b, lower tank body; 111c, vacuum sealing flange; 112, partition; 12, regulating valve; 13, vacuum pump; 14, gas supplement pipeline; 15, gas supplement valve; 16, heater; 17, refrigeration subsystem; 171, evaporator; 172, electronic expansion valve; 173, condenser; 174, compressor; 18, control and display cabinet;

[0041] 21, upstream static pressure sensor; 22, downstream static pressure sensor; 23, total pressure sensor;

[0042] 31, upstream temperature sensor; 32, downstream temperature sensor. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Figures 1-2 It is apparent that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0044] The embodiments of the present application disclose an airborne fan product performance test bench. Referring to the accompanying drawings, Figure 1The performance test bench for the airborne fan product includes a circulating pipeline 11, the circulating pipeline 11 is provided with an installation position of the tested fan 100, and the circulating pipeline 11 is connected with an adjusting valve 12, the back pressure of the tested fan 100 can be changed by adjusting the opening angle of the adjusting valve 12, so that the total pressure head and the flow of the tested fan 100 can be changed.

[0045] In an embodiment, the circulating pipeline 11 can be a ring-shaped sealed pipeline. In the embodiment, the circulating pipeline 11 is formed by a sealed tank, referring to Figure 2 The sealed tank includes a tank body 111 and a partition 112 fixed in the tank body 111, the tank body 111 includes an upper tank body 111a and a lower tank body 111b, and the upper tank body 111a and the lower tank body 111b are connected and sealed by a vacuum sealing flange 111c.

[0046] The partition 112 is located in the tank body 111 and divides the tank body 111 into two areas, and the partition 112 is communicated with the inside and outside of the tank body 111 to form the circulating pipeline 11. Specifically, in the embodiment, the partition 112 is a partition pipe with two open ends, which is arranged in the middle of the tank body 111, and the partition pipe is provided with the installation position of the tested fan 100. Referring to Figure 1 The tank body 111 is provided with an air inlet at a position opposite to the partition pipe, a gas supplement pipe 14 is communicated with the air inlet, and the gas supplement pipe 14 is provided with a gas supplement valve 15. The tank body 111 is provided with an air outlet at a position staggered with the partition pipe, and a vacuum pump 13 is communicated with the air outlet through an air outlet pipe for extracting the gas in the circulating pipeline 11.

[0047] The tested fan 100 is started, the gas flows from the inside of the partition pipe to the outside of the partition pipe, and then flows back to the inside of the partition pipe to form a circulating gas flow. The gas supplement valve 15 is closed, and the gas in the tank body 111 is extracted by the vacuum pump 13 to change the gas density in the tank body 111, simulate the working height of the fan, and according to the different limit extraction speed of the vacuum pump 13, the maximum simulation height can reach 20 km.

[0048] Referring to Figure 1 The circulating pipeline 11 is provided with a heater 16 and a refrigeration subsystem 17. Specifically, the heater 16 is annular and fixed to the periphery of the end of the partition pipe, the refrigeration subsystem 17 includes an evaporator 171, an electronic expansion valve 172, a condenser 173 and a compressor 174 which are communicated with each other, and the evaporator 171 is arranged between the partition pipe and the tank body 111. The heater 16 is turned on to heat the gas in the tank body 111, the refrigeration subsystem 17 is turned on to refrigerate the gas in the tank body 111, the temperature of the working environment of the fan is simulated, and the simulation temperature range is -55℃-95℃.

[0049] The upstream static pressure sensor 21 and the downstream static pressure sensor 22 are arranged on both sides of the installation site respectively, for measuring the static pressure upstream and downstream of the test fan 100, and the difference between the static pressure P1 upstream of the test fan 100 and the static pressure P2 downstream of the test fan 100 is the pressure difference ΔP = P2 - P1.

[0050] The total pressure sensor 23 is arranged downstream of the installation site, for measuring the total pressure P* in the circulating pipeline 11.

[0051] The upstream temperature sensor 31 is arranged upstream of the installation site, for measuring the static temperature T1 upstream of the installation site. The downstream temperature sensor 32 is arranged downstream of the installation site, opposite to the downstream static pressure sensor 22, for measuring the static temperature T2 at the test section where the downstream static pressure sensor 22 is located.

[0052] The control and display cabinet 18 is connected with the upstream static pressure sensor 21, the downstream static pressure sensor 22, the total pressure sensor 23, the upstream temperature sensor 31 and the downstream temperature sensor 32. The control and display cabinet 18 is used to obtain the volume flow Q of the test fan 100 according to the inner diameter d of the circulating pipeline 11, the total pressure P* in the circulating pipeline 11, the static pressure P1 upstream of the test fan 100, the static pressure P2 downstream of the test fan 100 and the static temperature T2 at the test section where the downstream static pressure sensor 22 is located.

[0053] The calculation formula of the volume flow Q is as follows:

[0054]

[0055] Wherein, Q is the volume flow of the test fan 100, unit m 3 / s;

[0056] d is the inner diameter of the partition pipe, unit m;

[0057] P* is the total pressure in the circulating pipeline 11, unit Pa;

[0058] P2 and T2 are the static pressure (unit Pa) and the static temperature (unit K) at the same test section respectively.

[0059] By adjusting the regulating valve 12 on the circulating pipeline 11, a group of ΔP and Q values of the test fan 100 is obtained by changing the angle of each regulating valve 12. According to the corresponding relationship between the pressure difference ΔP and the volume flow Q, the fitting curve of the pressure difference and the volume flow of the test fan 100 under the current environment (simulated height and simulated temperature) is fitted, which can be fitted by using the least square method.

[0060] The test system further comprises an ammeter and a voltmeter electrically connected with the test fan 100 for measuring the current and voltage of the test fan 100, and the control and display cabinet 18 is connected with the ammeter and the voltmeter for obtaining the efficiency curve of the test fan 100 according to the current and voltage of the test fan 100, the differential pressure and the flow rate of the test fan 100.

[0061] The efficiency is calculated according to the following formula:

[0062] Wherein, η is the efficiency of the test fan 100;

[0063] ΔP is the differential pressure of the test fan 100;

[0064] Q is the flow rate of the test fan 100;

[0065] I is the current of the test fan 100;

[0066] U is the voltage of the test fan 100.

[0067] The control and display cabinet 18 is further connected with the test fan 100, and for the variable frequency fan, the speed of the test fan 100 is changed (the corresponding current is adjusted) through the control and display cabinet 18, and the fitting curve family of the differential pressure and the flow rate of the test fan 100 under different speed conditions in the current environment (simulated height and simulated temperature) is fitted and drawn in the same coordinate system according to the corresponding relationship between the differential pressure and the flow rate under different speed conditions.

[0068] According to different uses, the equal flow rate curve and the equal pressure head curve can be formed, and the flow rate requirement corresponding to the heat load value of the cooled object at different heights can be visualized.

[0069] The control and display cabinet 18 is used for obtaining the temperature rise ΔT=T2-T1 of the test fan 100 under different differential pressure and flow rate conditions according to the static temperature of the upstream and the downstream of the installation position.

[0070] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms “mounting” and “connection” should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise expressly and specifically limited.

[0072] The above are preferred embodiments of the application, and are not intended to limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape, principle of the application shall be covered within the protection scope of the application.

Claims

1. An airborne fan product performance test bench, characterized in that, The application relates to a fan flow rate test system. The system comprises a circulating pipeline (11) connected with a regulating valve (12), wherein an installation position of a test fan (100) is arranged in the circulating pipeline (11); an upstream static pressure sensor (21) and a downstream static pressure sensor (22) are arranged on both sides of the installation position respectively, and are used for measuring the static pressures on the upstream and downstream of the test fan (100), wherein the difference between the static pressures on the upstream and downstream of the test fan (100) is a pressure difference; a total pressure sensor (23) is arranged on the downstream of the installation position, and is used for measuring the total pressure in the circulating pipeline (11); a downstream temperature sensor (32) is arranged on the downstream of the installation position, and is opposite to the downstream static pressure sensor (22), and is used for measuring the static temperature at a test section where the downstream static pressure sensor (22) is arranged; and a control and display cabinet (18) is connected with the upstream static pressure sensor (21), the downstream static pressure sensor (22), the total pressure sensor (23) and the downstream temperature sensor (32), and is used for obtaining the volume flow rate of the test fan (100) according to the inner diameter of the circulating pipeline (11), the total pressure in the circulating pipeline (11), the static pressures on the upstream and downstream of the test fan (100) and the static temperature at the test section where the downstream static pressure sensor (22) is arranged. The sealing tank comprises a tank body (111) and a partition (112) fixed in the tank body (111), the partition (112) is communicated with the inside and outside of the tank body (111), and the inside of the tank body (111) forms the circulating pipeline (11); the partition (112) is a partition pipe with open two ends, is arranged in the middle of the tank body (111), and the installation position of the test fan (100) is arranged in the partition pipe. Wherein, Q is the volume flow rate of the test fan (100), d is the inner diameter of the partition pipe, R is a gas constant, P* is the total pressure in the circulating pipeline, P2 and T2 are the static pressure and the static temperature at the same test section on the downstream respectively. According to the corresponding relationship between the pressure difference and the volume flow rate, a fitting curve of the pressure difference and the volume flow rate of the test fan (100) under the current environment is fitted. The control and display cabinet (18) is further used for being connected with the test fan (100), changing the rotating speed of the test fan (100), fitting a fitting curve family of the pressure difference and the volume flow rate of the test fan (100) under different rotating speed working conditions in the current environment according to the corresponding relationship between the pressure difference and the volume flow rate under different rotating speed working conditions. An air outlet and an air inlet are arranged on the circulating pipeline (11), the system further comprises a vacuum pump (13) communicated with the air outlet through an air outlet pipe and used for extracting the gas in the circulating pipeline (11), and a gas supplement pipe (14) communicated with the air inlet, wherein a gas supplement valve (15) is arranged on the gas supplement pipe (14). The formula for calculating the volumetric flow rate Q of the subject fan (100) is: ; A heater (16) is arranged on the circulating pipeline (11). The system further comprises a refrigeration subsystem (17), wherein the refrigeration subsystem (17) comprises an evaporator (171), an electronic expansion valve (172), a condenser (173) and a compressor (174) which are communicated with each other, and the evaporator (171) is connected with the circulating pipeline (11).

2. The airborne fan class product performance test bed of claim 1, wherein, ​ 3. The airborne fan class product performance test bed of claim 1, wherein, ​ 4. The airborne fan class product performance test bed of claim 1, wherein, ​ 5. The airborne fan class product performance test bed of claim 1, wherein, ​ 6. The airborne fan class product performance test bed of claim 1, wherein, The application also comprises an upstream temperature sensor (31) arranged upstream of the installation position for measuring the static temperature upstream of the installation position, and the control and display cabinet (18) is connected with the upstream temperature sensor (31) for obtaining the temperature rise of the tested fan (100) under different pressure differences and different flow conditions according to the static temperatures upstream and downstream of the installation position.

7. The airborne fan class product performance test bed of claim 1, wherein, The application also comprises an ammeter and a voltmeter for electrically connecting with the tested fan (100) for measuring the current and voltage of the tested fan (100), and the control and display cabinet (18) is connected with the ammeter and the voltmeter for obtaining the efficiency curve of the tested fan (100) according to the current and voltage of the tested fan (100) and the pressure difference and flow of the tested fan (100).

Images