Full-ring combustion chamber test piece flow resistance characteristic data processing method

Abstract

The invention belongs to the field of aviation turbofan engine main combustion chamber design, particularly relates to a full-ring combustion chamber test piece flow resistance characteristic data processing method, and provides a combustion chamber flow resistance characteristic data processing method, namely a head estimation correction method on the basis of a direct processing method and a turbine bleed air correction method. That is to say, in combustion chamber flow resistance characteristic data processing, middle ring cavity airflow pressure loss is considered. When the total pressure loss of the diffuser is calculated, the loss part of the middle ring cavity is added, the combustion chamber flow resistance characteristic closer to the real situation can be obtained, and the evaluation error is reduced.

Description

technical field [0001] The application belongs to the field of design of the main combustion chamber of an aviation turbofan engine, and in particular relates to a data processing method for the flow resistance characteristics of a test piece of a full-ring combustion chamber. Background technique [0002] The invention relates to the field of design of a main combustion chamber of an aviation turbofan engine, in particular to the evaluation of actual flow resistance characteristics of the main combustion chamber. [0003] The aero-engine is the "heart" of the aircraft, and the combustion chamber, one of the three major components of the core engine of the combustion aero-engine, is the "heart" in the "heart". Its main function is to convert the chemical energy of fuel and air into thermal energy of combustion products and remaining unprevented air through combustion, so that the total energy of high-pressure air flowing out of the compressor increases, which is required for...

AI Technical Summary

Problems solved by technology

In engineering practice, due to the high temperature and high pressure environment at the outlet of the combustion chamber and the limitation of structural space, it is impossible to obtain the total pressure at the outlet of the combustion chamber in the state of the core machine, and it is difficult to evaluate the flow resistance characteristics of the combustion chamber in the actual working state of the whole machine

[0005] Since the inlet air of the combustion chamber is divided into three airflows through the diffusion and flow splitting effect of the diffuser, they flow into the inner ring cavity, the outer ring cavity and the middle ring cavity (the head of the flame tube) respectively. Therefore, under real conditions, the diffuser always The pressure loss is obtained by weighting the pressure loss of the three airflows. The data processing method of the flow resistance characteristics of the combustion chamber full-ring test piece mentioned in the first section above ignores the pressure loss of the inlet part of the middle ring cavity, which will lead to The total pressure loss of the diffuser is lower than the real value at the inlet Mach number, and there is a certain deviation in the evaluation of the flow resistance characteristics of the combustion chamber of the whole machine

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