Low-speed characteristic extrapolation method for gas compressor

Abstract

The invention discloses a low-speed characteristic extrapolation method for a gas compressor to solve the problem that an existing low-speed characteristic extrapolation method for the gas compressor does not consider the influence of compressibility of a working medium on a low-speed characteristic. The method is suitable for obtaining gas compressor low-speed characteristics of a ground gas turbine and an aero-engine. The method is characterized in that the low-speed characteristic extrapolation method considers application conditions of a similar principle and the low-speed condition characteristic of the gas compressor, an index of the similar principle is improved, an optimal index is obtained through an optimization algorithm, and a coefficient fitting method for variable condition calculation of the gas turbine is applied to the low-speed characteristic extrapolation of the gas compressor so as to obtain the low-speed characteristic. The low-speed characteristic extrapolation method for the gas compressor, adopted in the invention, and the method for obtaining the optimal index of the similar principle through a genetic algorithm have wide application values.

Description

technical field [0001] The present invention mainly relates to a method for obtaining low-speed characteristics of a gas turbine or an aeroengine compressor, specifically, a method for extrapolating characteristics of a gas turbine or aeroengine compressor based on an exponential improvement based on a similarity principle is proposed. Background technique [0002] The characteristics of the compressor are an important index to measure the performance of the compressor. However, it is difficult to obtain the characteristics of the compressor at low speed through the test method or CFD numerical method. In order to solve the problem of obtaining the characteristics of the compressor at low speed, Sexton did not consider the compressibility of the working fluid. In the case of the influence of performance on the speed characteristics, it is proposed that under similar working conditions, the low speed characteristics of the compressor can be extrapolated through the n-th power ...

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Problems solved by technology

[0004] In order to solve the problems of difficulty in obtaining the low-speed characteristics of the compressor and the shortage of the existing low-speed characteristic extrapolation method based on the similarity principle, the present invention improves the similarity principle according to the application conditions of the similarity principle and the characteristics of the low-speed working condition of the compressor, and proposes An extrapolation method for the low-speed characteristics of a gas turbine or aero-engine compressor based on the similarity principle is proposed, and the optimal index is obtained through an optimization algorithm, and the m at low speed is fitted cor -φ, m cor -π and m cor -η s characteristics, apply the coefficient fitting method calculated by the variable operating conditions of the gas turbine to the extrapolation of the low-speed characteristics of the compressor, and realize the extrapolation of the low-speed characteristics from the high-speed characteristics of the compressor

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