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Method for calculating mass weighted mean

A technology of weighted average value and calculation method, applied in aerodynamic testing in the aerospace field, can solve the problem of difficulty in obtaining mass flow, and achieve the effect of high precision, simple calculation method and simple calculation.

Active Publication Date: 2016-07-13
AECC SHENYANG ENGINE RES INST
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Problems solved by technology

[0005] The purpose of the present invention is to propose a method for obtaining mass weighted average value with simple calculation and high precision for the problem that the mass flow rate at each measuring point is not easy to obtain in the mass weighted average method

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  • Method for calculating mass weighted mean
  • Method for calculating mass weighted mean
  • Method for calculating mass weighted mean

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Embodiment 1

[0028] This embodiment provides a mass-weighted average calculation method, which mainly includes five steps, specifically: measurement point layout method, isentropic index k value calculation, velocity coefficient λ and flow function q(λ) calculation, approximate mass flow rate Calculation, parameter quality weighted average calculation;

[0029] In the method of measuring point layout, it is required that the total pressure and total temperature measuring points are evenly distributed. For circular pipes, it is required to be evenly distributed at circumferential angles and radially at equal radii; for rectangular pipes, it is required to be uniformly distributed in length and width;

[0030] In the measuring point layout method, the responsible area boundary line of each measuring point is selected on the center line of two adjacent measuring points; in the measuring point layout method, the same number of total temperature and total pressure measuring points are required ...

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Abstract

A method for calculating mass weighted mean mainly comprises five steps and specifically comprises the first step of adoption of a measuring point arrangement method, isentropic exponent value k calculation, speed coefficient lambda and flow function q (lambda) calculation, approximate mass flow calculation and parameter mass weighted mean calculation. In the measuring point arrangement method, it is required that total pressure measuring points and total temperature measuring points are arranged uniformly; boundaries of the responsible area of each measuring point are selected on a center line of the two adjacent measuring points, and it is required that the number of the total temperature measuring points and the number of the total pressure measuring points arranged in the same area are equal. The method for calculating the mass weighted mean has the advantages that calculation is easy, precision is high, calculation of the mass weighted mean of related pneumatic parameters in a uniform flow field can be achieved, and the problem that the mass flow at the measuring points is not easy to acquire is solved. The calculation method is simple, precision is high, and calculation of the mass weighted mean of the related pneumatic parameters in all flow fields can be achieved.

Description

technical field [0001] The invention relates to the field of aerodynamic testing in the field of aviation and aerospace, in particular to a method for calculating a weighted average value of mass. Background technique [0002] In the aerodynamic test in the field of aviation and aerospace, in order to obtain the relevant parameter values ​​of a certain section, it is necessary to process the data of multiple measuring points on the same section to obtain the average value of the parameter section. In order to obtain measurement data at different positions in the section, especially for complex flow fields, it is desirable to have as many measurement points as possible. But in reality, the number of measuring points is greatly limited. On the one hand, it is limited by space, and on the other hand, the more measuring points, the greater the disturbance to the flow field. Therefore, it is very important to obtain an average value that is closer to the real value by processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 蒋联友孙雨超李江宁李娜赵巍马召祥
Owner AECC SHENYANG ENGINE RES INST
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