Air flow tester for measuring flow area

Abstract

The utility model provides an air flow tester for measuring a flow area. The air flow tester comprises a box body, two openable doors are arranged on the box body, an opening is formed in one end face of the box body, a variable-size test piece mounting plate is mounted at the opening, and a test piece is mounted on the variable-size test piece mounting plate; a motor is further arranged in the box body and drives two fans through a synchronous belt, air outlets of the two fans are connected with an air volume inlet section, and the air volume inlet section is sequentially connected with a rectifying section and a pressure measuring cavity. A plurality of layers of rectification damping nets and rectification grids are arranged in the rectification section; and the pressure measuring cavity is connected with the variable-size test piece mounting plate. According to the utility model, normal-temperature air is adopted as a medium, the motor drives the fan to provide an air source, and the flow capacity detection of a complex throttling element can be completed. The equipment is high in test efficiency, low in test cost and high in test precision.

Description

Technical Field

[0001] The utility model relates to the fields of aero-engines and gas turbines, etc., and specifically relates to an air flow tester for measuring the effective flow area, which is mainly used for measuring the effective flow area of complex throttle parts. Background Technique

[0002] When an aero-engine or a gas turbine works, the flow capacity of the gas turbine and the power turbine determines the distribution of the expansion ratio of the high-pressure gas from the outlet of the combustion chamber, and this ratio has a decisive impact on the overall performance of the engine. Therefore, the flow capacity of the turbine is crucial. Generally speaking, the key parts determining the flow capacity of the gas turbine and the power turbine are the gas turbine and the power turbine guide vanes. This part consists of a whole ring of cascades composed of multiple turbine blades. Its throttling position is at the minimum of the contraction channel formed by adjacent cascades, and it forms a flow area together with the upstream and downstream channels of the part.

[0003] Currently, the main detection methods for the guide flow area (flow capacity) in China mainly include methods such as direct dimension measurement, water flow test, and flow function test.

[0004] Direct dimension measurement uses a coordinate measuring machine or an optical method to directly measure the channel. However, since the throat affecting the energy-saving ability of the part is of special shape and its size is very small, engineering practice shows that its accuracy cannot reach the range of ±1%. Due to the large number of guide vane blades, the measurement efficiency is very low and the time consumption is long.

[0005] The water flow test determines the throttling ability of the part by establishing a large water container and judging according to the length of time for the same volume of water to drain through the guide vane. Due to reasons such as the large change of the viscosity of water with temperature and the subjective influence of the operator on time judgment, the accuracy also cannot meet the requirements.

[0006] The flow function test is the test method with the highest accuracy and the most extensive application. This method follows the law of kinematic similarity in fluid mechanics and simulates the state of the air flow in the engine through conversion. During the test on the test bench, the throttling part is arranged downstream, and the volume flow rate of the air flow passing through is measured by a sonic venturi tube. After converting it into a mass flow rate and combining with the measured total inlet temperature and total pressure, the flow function value is calculated. The advantage of this method is relatively high accuracy, but there are also many disadvantages. This method requires the establishment of an independent test vehicle platform and a high-pressure gas source station, with high construction costs, long single test time, and a large number of personnel required for the test. Content of the Utility Model

[0007] Aiming at the above technical problems, the utility model provides a flow area detection device that can be fast, efficient, and low-energy-consuming.

[0008] The technical solution adopted by the utility model to solve its technical problems is:

[0009] An air flow tester for measuring the flow area includes a box body, on which there are two openable doors, one end face of the box body is open, and a variable-size test piece mounting plate is installed at the opening; the test piece is installed on the variable-size test piece mounting plate;

[0010] The box body also includes a motor, the motor drives two fans through a synchronous belt, the air outlets of the two fans are connected to the air volume inlet section, and the air volume inlet section is sequentially connected to the rectification section and the pressure measurement chamber; there are multiple layers of rectification damping nets and rectification grids in the rectification section; the pressure measurement chamber is connected to the variable-size test piece mounting plate.

[0011] An intake air filter element and an electrical cooling ventilation fan are also provided on the box body.

[0012] Multiple mounting hole plate blocks are provided on the variable-size test piece mounting plate.

[0013] It also includes a test system, the test system includes a wind pressure sensor, a temperature sensor, a humidity sensor, and a rotational speed sensor, each sensor is connected to the control system of the computer mainframe, and the computer mainframe is connected to the display screen provided on the box body.

[0014] The utility model uses normal-temperature air as the medium and uses a fan to provide the air source, and can complete the detection of the flow capacity of complex throttle parts. Brief Description of the Drawings

[0015] Figure 1 is the internal structure of the equipment of the utility model;

[0016] Figure 2 is the external schematic diagram of the equipment of the utility model;

[0017] Figure 3 is the schematic diagram of the back of the equipment of the utility model;

[0018] Figure 4 is the schematic diagram of the structure for installing the test piece of the utility model.

[0019] In the figure, the corresponding relationship between the component names and the drawing reference numbers is as follows:

[0020] 1. Motor; 2. Fan; 3. Computer mainframe; 4. Air volume inlet section; 5. Rectification section; 6. Pressure measurement chamber; 7. Synchronous belt; 8. Box body; 9. Openable door; 10. Test piece; 11. Test piece mounting plate; 12. Display screen; 13. Intake air filter element; 14. Electrical cooling ventilation fan; 15. Mounting hole plate block. Detailed Description of the Embodiment

[0021] The following further describes in detail the embodiments of the utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but cannot be used to limit the scope of the utility model.

[0022] In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0023] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Embodiment

[0024] As Figures 1 to 4 shown, an air flow tester for measuring the flow area includes a box body 8, on which there are two openable doors 9, one end face of the box body 8 is open, and a variable-size test piece mounting plate 11 is installed at the opening; a test piece 10 is installed on the variable-size test piece mounting plate 11;

[0025] The box body 8 further includes a motor 1, the motor 1 drives a fan 2 through a synchronous belt 7, the air outlet of the fan 2 is connected to an air volume inlet section 4, and the air volume inlet section 4 is successively connected to a rectification section 5 and a pressure measurement chamber 6; there are multiple rectification damping nets and rectification grids in the rectification section 5; the pressure measurement chamber 6 is connected to the variable-size test piece mounting plate 11.

[0026] An intake air filter element 13 and an electrical cooling ventilation fan 14 are also provided on the box body 8.

[0027] A plurality of mounting hole plate pressing blocks 15 are provided on the variable-size test piece mounting plate 11.

[0028] It further includes a test system, the test system includes a wind pressure sensor, a temperature sensor, a humidity sensor, and a rotational speed sensor, each sensor is connected to the control system of a computer mainframe, and the computer mainframe 3 is connected to a display screen 12 provided on the box body 8. The display screen 12 displays an equipment operation interface, including operation functions such as test control, parameter setting, and test result viewing, and provides a good man-machine interface.

[0029] The motor 1 drives the fan 2 to generate a large flow of air volume and provide pressure head. The air generated by the fan 2 is mixed in the air volume inlet section 4, and the large vortex clusters in the air flow are broken up by the multi-layer rectifying damping nets and rectifying grids in the rectifying section 5, becoming a flow field with uniform pressure and a certain degree of turbulence; after rectification, the air flow enters the pressure measurement chamber 6, where temperature sensors and pressure sensors are arranged to measure the temperature and pressure values in the pressure measurement chamber 6; at the other end of the pressure measurement chamber 6, a variable-size test piece mounting plate 11 is arranged with the test piece 10 to be tested, and the air flow in the pressure measurement chamber 6 is discharged into the atmosphere therefrom.

[0030] During the test, the required parameters in the pressure measurement chamber 6 are set. When the parameters in the pressure measurement chamber 6 are lower than the required parameters, by increasing the input current frequency of the motor 1, the speeds of the motor 1 and the fan 2 are increased, so as to achieve the purpose of increasing the air volume; when it is higher than the set required air volume, the speed of the motor 1 is decreased.

[0031] Finally, by controlling the equipment parameters, the parameters in the pressure measurement chamber 6 are stabilized at the target value. At this time, each test parameter is recorded.

[0032] The specific operation process of the test is as follows:

[0033] Calibrate the equipment as follows: Install the test pieces 10 with multiple groups of different known throttling areas at the position of the test piece mounting plate 11. During the test, input the required pressure value of the pressure measurement chamber 6 from the man-machine interface, and control the speed of the fan 2 by adjusting the input current frequency of the motor 1 to control the output air volume, so as to control the pressure in the pressure measurement chamber 6. Adjust the pressure in the pressure measurement chamber 6 to the set target value. The larger the orifice throttling area is, the higher the fan speed is, and the smaller the throttling area is, the lower the fan speed is. Record the corresponding relationship between the throttling area of each orifice plate 10 and the fan speed 2 under the condition of keeping the pressure in the pressure measurement chamber 6 constant.

[0034] After calibration, install the test piece to be measured for the flow area at the position of the test piece mounting plate 11, and set the pressure in the pressure measurement chamber 6 to be the same as that under the calibration condition. When the pressure in the pressure measurement chamber 6 is stable, record the speed of the fan 2.

[0035] Calculate the flow area of the test piece. Through calibration, under the fixed pressure adjustment of the pressure measurement chamber 6, a series of corresponding relationships between the flow areas of different orifice plates 10 and the fan speed 2 are obtained, and interpolation calculation is performed on the speed obtained by the test piece under this pressure, so as to calculate the flow area of the test piece.

[0036] The test can precisely control the speed of the fan 2 by controlling the variable-frequency motor 1, so as to accurately and quickly control the air pressure in the pressure stabilizer 6, with high test efficiency; the test air source is driven by the motor to drive the fan, and the test cost is low; under the condition of a fixed pressure in the pressure measurement chamber 6, the flow area of the test piece is reflected by the fan 2 speed. Because the speed adjustment accuracy is high, it can meet the high-precision requirements of the test.

[0037] The embodiments of the present utility model are given for purposes of illustration and description, and are not exhaustive or limit the present utility model to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better illustrate the principles of the present utility model and its practical applications, and to enable those of ordinary skill in the art to understand the present utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An air flow tester for measuring the flow area, characterized in that, It includes a box body (8), on which there are two openable doors (9). One end face of the box body (8) is open, and a variable-size test piece mounting plate (11) is installed at the opening; the test piece (10) is installed on the variable-size test piece mounting plate (11). Inside the box body (8), there is also a motor (1). The motor (1) drives two fans (2) through a synchronous belt (7). The air outlets of the two fans (2) are connected to an air volume inlet section (4), and the air volume inlet section (4) is sequentially connected to a rectifying section (5) and a pressure measurement chamber (6); there are multiple layers of rectifying damping nets and rectifying grids inside the rectifying section (5); the pressure measurement chamber (6) is connected to the variable-size test piece mounting plate (11).

2. The air flow tester for measuring the flow area according to claim 1, characterized in that An intake air filter element (13) and an electrical cooling ventilation fan (14) are also provided on the box body (8).

3. The air flow tester for measuring the flow area according to claim 1, wherein Multiple mounting hole plate pressing blocks (15) are provided on the test piece mounting plate (11).

4. The air flow tester for measuring the flow area according to claim 1, characterized in that, There is also a test system, which includes a wind pressure sensor, a temperature sensor, a humidity sensor, and a rotational speed sensor. Each sensor is connected to the control system of a computer mainframe (3), and the computer mainframe (3) is connected to a display screen (12) provided on the box body (8).

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