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

A flow area and supercritical technology, which is applied in the direction of measuring devices, machine/structural component testing, instruments, etc., can solve the problems of inability to accurately measure small and complex faces, poor versatility of measuring devices, and small measuring range, so as to eliminate air Limited compressibility, strong versatility, and few influencing factors

Active Publication Date: 2008-03-12
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

[0064] Install the measured part with a complex face in the measuring device in the manner shown in Figure 1 and Figure 2, fasten the measured part 12 with the mounting edge 17, and pay attention to not allowing air leakage. 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 through the throttle o...

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Abstract

The invention discloses a method for measuring the circulation area of complex profile hole, main contents of which are that the air pressure P1* in front of the workpiece profile hole to be measured is adjusted to the supercritical pressure ratio, namely not less than 2 times of atmospheric pressure Po in order to ensure that air passes through the profile hole at a critical speed, and the air after further expansion is discharged into the atmosphere through an exhaust pipe. Measuring the air pressure P1* in front of the profile hole, the air temperature T1* and the air flow Ga through a pipeline, calculating the coefficient m of the air through the air adiabatic index K and the gas constant R, and substituting these data into the flow equation of compressible flow to calculate the circulation area of the complex profile hole to be measured. Compared with the prior art method of measuring the area of the profile hole with the air power, the method disclosed by the invention, which measures the circulation area of the complex profile hole with the supercritical pressure ratio, has the advantages of the high measurement precision, the large measurement range, the strong commonality of a measuring device and the convenient operation, and solves the problem of precise measurement of the circulation area of the complex profile hole with the small circulation area.

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 Applications(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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