Abstract: the amount of compressed air flow meter
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Abstract: the engine test, usually used in between inlet outlet and engine inlet equipped with measuring rake, the total static parameters of the section, to measure and obtain import compressed air flow engine.
Considering the boundary layer effect, use the new attached to the surface.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is the compressed air flow meter scale quantity analysis details.
Engine test, we usually use between inlet export and import engine equipped with measuring rake, the total static parameters of the section, to measure and obtain import compressed air flow engine.
Considering the boundary layer effect, USES the new pressure boundary layer composite harrow for measurement.
At the same time, to obtain different cross section flow field pressure measuring scheme is analyzed, and combined with the test data, the different scheme of measurement error are analyzed.
The results show that the combination of pressure measuring rake can get more correct engine import compressed air flow, and using pressure, differential pressure sensor for cross section flow field can significantly reduce the engine import compressed air flow and the measurement error of boundary layer.
1, the introduction of inlet and engine compatibility is an important evaluation index of comprehensive evaluation of aircraft propulsion system.
Inlet and engine compatibility test, the compressed air flow is an important measurement parameter.
In engine performance test, the thrust measurement is particularly important, and compressed air flow is an important measure in the thrust measurement parameters.
Therefore, access to the engine compressed air flow is an important content of engine test, is of great significance for aircraft engine design.
Test process, reasonable, cleverly planning scheme can effectively reduce the measuring error measurement.
In flight test, generally in the export and import the transition section between the engine inlet equipped with measuring rake, cross section measurement of flow field information, obtain flow of compressed air engine imports.
Foreign research on engine compressed air flow measurement and calculation of the early, has accumulated rich experience in engineering, testing technology and theory is advanced, and in terms of engine pneumatic pressure measurement, the United States to the design of the measuring rake and infected developed detailed standard and error analysis.
Domestic for compressed air flow measurement and calculation of the engine, engineering research and application have been carried out also, China academy of gas turbine in engine pneumatic pressure measurement rake and infected part design and error analysis have been studied in detail, China academy of flight test in engine test is the compressed air flow measurement, and made some achievements.
In the cross section flow field measurement, pressure measurement is the key, there are large difference between different measurement methods will lead to the result, the current main sensor and differential pressure sensor to measure the absolute pressure.
When measuring engine import compressed air flow, this paper USES a pressure boundary layer combination measuring rake, combined with the engine test results, through compressed air flow calculation, and the absolute pressure sensor and differential pressure sensors were used respectively to measure the pressure of the error are analyzed.
2, measuring scheme of gas flow in inlet area, can be divided into is not affected by viscosity mainstream region and the influence of viscous boundary layer region.
Mainstream area parameter measurement is easy to implement, and diverse methods.
Boundary layer region due to the effect of viscosity, the accurate measurement in engineering has been more difficult.
In the boundary layer measurement and calculation in our country, although for actual engineering research and application, but is still a lack of engineering experience, traditional measurement method is also relatively, measurement error is bigger.
When making an engine test, in view of the flow field in the mainstream area and the flow characteristics of the boundary layer in the development of the previous measuring rake and engineering application, based on the combination of boundary layer measuring harrow, we design a can not only measure the mainstream area flow field information, and can obtain with the combined measurement rake face of laminar flow field information, as shown in figure 1.
Trailing front four infected department for measurement mainstream zone flow field information of pitot static pressure always infected, near the roots of 10 infected for measuring the total pressure of the boundary layer by the department.
Test, measurement rake installed in export and import the transition section between the engine inlet, the section were equipped with six pressure rake, three of the branch of the pressure boundary layer combination measuring rake, 3 to the site of boundary layer pressure measurement rake (
Near the roots of pitot tube station is located in the boundary layer)
At the same time equipped with three temperature rake, the circumferential uniform distribution along the cross section measurement.
Measuring rake installation and distribution of measuring points is shown in figure 2.
In compressed air flow measurement, calculation, measurement section of total pressure, static pressure is very important.
Due to pressure measurement way is diversiform, below, from the Angle of sensor selection, pressure measurement way, absolute pressure sensor and differential pressure sensors were used respectively to two measuring methods, the mainstream region and boundary layer pressure measurement.
Measurement scheme 1: apply directly to measure absolute pressure sensor mainstream area total pressure, static pressure and total pressure boundary layer.
Measurement scheme 2: adopt the method of directly testing the total static pressure difference, namely USES the absolute pressure sensor and pressure respectively in main differential pressure sensor, the total pressure boundary layer is the indirect measurement with a differential pressure sensor.
When measuring the pressure cabin pressure as the benchmark, to prevent air disturbance, cabin pressure sensors placed within the fixed iron boxes in the engine compartment.
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