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Method for predicting surge frequency of axial flow compressor

A technology of axial flow compressor and frequency prediction, which is applied in the direction of mechanical equipment, engine function, machine/engine, etc., can solve the problems of poor practicability and achieve the effect of good practicability and saving manpower

Active Publication Date: 2020-02-28
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] In order to overcome the shortcomings of poor practicability of the existing axial flow compressor surge frequency measurement method, the present invention provides a method for predicting the axial flow compressor surge frequency

Method used

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  • Method for predicting surge frequency of axial flow compressor
  • Method for predicting surge frequency of axial flow compressor
  • Method for predicting surge frequency of axial flow compressor

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Embodiment Construction

[0046] refer to Figure 1-4 . The specific steps of the method for predicting the surge frequency of the axial flow compressor of the present invention are as follows:

[0047] 1. Establish physical and geometric models of axial flow compressors;

[0048] First measure the geometric dimensions of the actual axial flow compressor, including the length of the inlet and outlet pipes, the cross-sectional area, the aspect ratio of the compressor, the volume of the gas collection cavity, etc., and then simplify it into a compression system model, that is, use the excitation plate instead of the compressor To generate pressure rise, use pipes of equal cross-section to replace the inlet and outlet pipes of the compressor, use a large gas collection chamber to simulate the back pressure environment, and use throttle valves to control the flow. Then assuming that the inlet Mach number is low and the gas in the compressor tube is incompressible, the process can be generalized as figur...

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Abstract

The invention discloses a method for predicting surge frequency of an axial flow compressor. The method is used for solving the technical problem of poor practicability of the existing method for measuring the surge frequency of the axial flow compressor. The technical scheme is as follows: firstly, the experimental table of the axial flow compressor is physically and geometrically modeled to obtain the conservation control equation of the corresponding model, and after the numerical method is used to solve, the numerical result under the working condition of over-stall is analyzed by Fouriertransform, so as to obtain the surge frequency of the axial flow compressor. Because the simulation model of the axial flow compressor system is established, the construction of the experimental platform and the data acquisition system is avoided, the experimental data measurement process is transformed into the parameter value obtained by numerical solution, and then the numerical result is directly used for data analysis and processing, and the Fourier transform is used to analyze the surge frequency of the compressor, which saves a lot of manpower and material costs, and has good practicability.

Description

technical field [0001] The invention belongs to the field of gas turbine engines, and in particular relates to a method for predicting the surge frequency of an axial flow compressor. Background technique [0002] The document "Fast Fourier Transform and Wavelet Transform Analysis of Compressor Surge Sound Signal, Energy Technology, 2010, Vol31, No.3, p125-128" discloses a method using fast Fourier transform and wavelet transform to obtain The method of analyzing and processing the surge signal data. This method is based on the compressor surge data obtained by experiment, and after using the fast Fourier transform to analyze the frequency spectrum of the test data, it is proved that the frequency of the compressor surge is below 50hz. Then wavelet transform is used to further process the data, and the sound characteristic signal representing the compressor entering into surge is obtained. The surge frequency obtained by this method is more accurate and reliable, which pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D27/00G06F30/20G06F111/10
CPCF04D27/001F05D2260/81F05D2260/82
Inventor 吴艳辉王振洋张紫云
Owner NORTHWESTERN POLYTECHNICAL UNIV
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