A method for expanding all-working-condition characteristics of a gas compressor

Abstract

The invention aims to provide a method for expanding all-working-condition characteristics of a gas compressor. According to the invention, based on an original similarity theorem, a surge point and an optimal operation point are taken as references; calculating similarity theorem indexes x1, y, x2, z among different rotating speeds respectively; then respectively introducing an air density changecorrection coefficient k1, k2 for correcting air density change caused by air compression at different rotating speeds; A genetic optimization algorithm can be adopted for calculation of k1 and k2, the error of the actual pressure ratio and the predicted pressure ratio under the same flow and the minimum value of the error of the actual efficiency and the predicted efficiency under the same flowserve as objective functions, and then the optimal solution of k1 and k2 is obtained. And the k1 and k2 are subjected to curve fitting at the rotating speed respectively, so that the k1 and k2 at thelow rotating speed are expanded to predict the characteristics of the gas compressor at the low rotating speed. The method can be used for obtaining the full-working-condition characteristic diagram of the gas compressor under the condition that only part of gas compressor characteristic lines exist, can also be used for encrypting the gas compressor characteristic lines, and has the advantages ofbeing high in calculation precision and high in calculation speed.

Description

technical field [0001] The invention relates to a method for predicting characteristics of a compressor in all working conditions. Background technique [0002] Gas turbines often work under off-design conditions due to start-up, load changes, shutdown and other environmental factors. The overall performance of a gas turbine mainly depends on the characteristics of the compressor, combustion chamber, turbine and other components, and the compressor has the most critical influence on the performance of the gas turbine. A complete characteristic curve of the core components of the gas turbine is the basis for accurate analysis of the characteristics of variable operating conditions. Due to various reasons, manufacturers only provide limited component characteristics in the high-speed region. The main obstacle to building a component-based gas turbine model is the lack of sufficient component characteristic data. Therefore, how to use a small number of characteristic curves t...

AI Technical Summary

Problems solved by technology

Due to various reasons, manufacturers only provide limited component characteristics in the high-speed region, and the main obstacle to building a component-based gas turbine model is the lack of sufficient component characteristic data

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