Method for measuring complicated type face flow area with supercritical pressure ratio

A flow area, supercritical technology, applied in the direction of measuring devices, testing of machines/structural components, instruments, etc., can solve the problems of inability to accurately measure small and complex faces, poor versatility of measuring devices, large measurement errors, etc., to eliminate air Limits on compressibility, strong versatility, and the effect of eliminating errors

Active Publication Date: 2009-12-09
CHENGDU ENGINE GROUP
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Problems solved by technology

[0029] In view of the deficiencies in the prior art using aerodynamic measurement of the face flow area method, the purpose of the present invention is to provide a method for measuring the complex face flow area with a supercritical pressure ratio, so as to solve the large measurement error existing in the prior art, Small measurement range, poor versatility of measurement devices and inability to accurately measure small and complex faces

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  • Method for measuring complicated type face flow area with supercritical pressure ratio
  • Method for measuring complicated type face flow area with supercritical pressure ratio
  • Method for measuring complicated type face flow area with supercritical pressure ratio

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Embodiment Construction

[0063] Press the part to be measured with a complex face into the figure 1 and figure 2 The method shown is installed in the measuring device, and the part 12 under test is fastened with the mounting edge 17, and no air leakage is allowed. The compressed air enters the air storage tank 2 from the air source 1. Its function is to stabilize the air pressure and remove the moisture and impurities in the air. Then the air flow passes through the air source valve 3, enters the air pipeline and passes through the constant pressure reducing valve 4, Reduce the air pressure to the set value. The pressure gauge 6 displays the pressure behind the first-stage constant pressure relief valve, and then through the second stage constant pressure relief valve 5 and the regulating valve 7, the pressure gauge 11 in front of the measured part is accurately adjusted to the set value P1 * , while the temperature T of the airflow is displayed by the thermometer 16 1 * , The airflow passes thro...

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Abstract

The invention discloses a method for measuring the flow area of ​​complex-shaped faces, the main content of which is: adjust the air pressure P1* in front of the measured workpiece-shaped face to a supercritical pressure ratio, that is, not less than 2 times the atmospheric pressure Po, to ensure The air passes through the molded face at a critical speed, then expands further, and is discharged into the atmosphere through the exhaust duct. Measure the air pressure P1* in front of the face, the air temperature T1* and the air flow Ga through the pipeline, calculate the coefficient m of the air from the air insulation index K and the gas constant R, and use these data to substitute into the flow equation of the compressible flow to calculate The flow area of ​​complex faces was measured. The method disclosed by the present invention for measuring the flow area of ​​complex face with supercritical pressure ratio has the advantages of high measurement accuracy, large measurement range, strong versatility of the measuring device, and convenient operation compared with the prior art method of measuring the area of ​​the complex face by using aerodynamic force. The problem of accurate measurement of the flow area of ​​complex face with small flow area is solved.

Description

technical field [0001] The invention relates to a method for measuring the flow area of ​​shaped faces, in particular to a method for accurately measuring the flow area of ​​irregular and complicated faces by using aerodynamic force. Background technique [0002] The existing method of measuring the flow area of ​​the type face using aerodynamics is to use a method far below the critical ratio, so that the air flows through the type face at a low speed. At this time, the flow of the air is close to the incompressible flow, and the Reynolds number of the air flow in the pipeline is kept greater than 3150. , that is, the influence of the viscosity of the air is also small enough, so the basic formula for design calculation can be expressed by the following formula: [0003] The air flow rate Ga(kg / s) through the type face is: [0004] [0005] Therefore the flow area of ​​the type face is: [0006] [0007] Among them: Ga-air flow through the face (Kg / s) [0008] f 型...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/28G01M9/00
Inventor 刘建方滨邵铁虹余革王春笋马勇方德胜
Owner CHENGDU ENGINE GROUP
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