A Format Conversion Method for Turbine Characteristics of Aviation Gas Turbine Engine

Abstract

The invention relates to a format conversion method for turbine characteristics of an aviation gas turbine engine. The abscissa is the drop pressure ratio, the converted flow rate and efficiency are the vertical coordinates, and a family of drop pressure ratio-converted flow rate is distinguished according to different conversion speed lines. The curve and the basic characteristics of the turbine in the form of the drop pressure ratio-efficiency curve are converted into a family of conversion speed-equivalent turbine work curves with the conversion speed as the abscissa, the equivalent turbine work and efficiency as the ordinate, and distinguished by different conversion flow lines and the converted speed-efficiency curve format of the turbine conversion characteristics. To provide a more sensitive form of turbine characteristics for aviation gas turbine engine modeling based on the component method, so as to avoid the disadvantage of poor convergence of model calculation due to the basic characteristics of the turbine because the converted flow rate is basically unchanged with the drop pressure ratio.

Description

technical field [0001] The invention relates to the technical field of aviation gas turbine engines, in particular to a format conversion method for turbine characteristics of aviation gas turbine engines. Background technique [0002] Turbine is a main component of aviation gas turbine engine. Its function is to convert the aerodynamic energy from the high-temperature and high-pressure gas in the combustion chamber into mechanical energy that drives the rotation of the engine rotor. Among them, the turbine characteristics describing the relationship between the conversion speed of the turbine, the equivalent turbine work, the drop pressure ratio, the conversion flow rate and the efficiency parameters are the basis of the mathematical model of the aviation gas turbine engine. Different expressions of turbine characteristics directly affect the quality of engine design, performance evaluation, control law design, fault diagnosis and health monitoring based on the engine mathe...

AI Technical Summary

Problems solved by technology

This method only introduces the auxiliary β line for interpolation calculation, but the fact that the converted flow in the basic characteristic curve of the turbine remains basically unchanged still exists, and the problem of insensitivity of interpolation during modeling due to the basically unchanged converted flow is still not solved. good solution

[0006] To sum up, in order to avoid the problem of poor convergence of model calculation due to the basic characteristics of the turbine used in the modeling of aviation gas turbine engines due to the fact that the converted flow rate is basically unchanged with the drop pressure ratio, an aviation gas turbine engine is provided without changing the nature of the turbine characteristics. The format conversion method of engine turbine characteristics has important engineering value in the application field of engine modeling

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