A steady-state performance analysis and optimization method for a variable cycle engine

Abstract

The invention relates to an analysis and optimization method for the steady-state performance of a variable-cycle engine. The method includes the first step of checking an engine performance calculation program, the second step of carrying out single-parameter adjustment influence analysis, the third step of selecting independent variables, an independent variable range and responsive variables, the fourth step of selecting an experiment design method and a sample scheme, the fifth step of calculating the sample scheme, the sixth step of establishing an approximation model, the seventh step of establishing an optimization equation set and solving the optimization equation set, and the eighth step of carrying out engine characteristic analysis under multi-parameter coupling influences. By means of the method, more comprehensive influencing characteristics of adjustable component parameters on the optimization objective of the steady-state performance of the engine can be easily and visually obtained with a small scheme calculation amount according to a scientific data analysis method, the optimal adjustable component parameter matching scheme can be conveniently and rapidly obtained according to the optimization objective, and thus the steady-state performance of the engine is analyzed and optimized. The method has the advantages of being high in precision, easy to implement and the like.

Description

technical field [0001] The invention belongs to the field of aero-engine design, in particular to a method for analyzing and optimizing the steady-state performance of a variable-cycle engine. Background technique [0002] In recent years, fighter jets are developing in the direction of multi-purpose and wide envelope, which prompts researchers to pay attention to the research of variable cycle engine technology. The variable cycle engine adjusts the parameters of the thermodynamic cycle by changing the geometry, size or position of the engine components, which can simultaneously take advantage of the advantages of large and small bypass ratio engines, so that the engine has both high thrust and low fuel consumption. It has the best thermodynamic cycle under all conditions, so it has good adaptability to flight speed and altitude, which is an important research direction of aero-engines at present. Compared with conventional turbofan engines, variable cycle engines have add...

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Problems solved by technology

The above methods all have limitations: the optimization method based on the research of parameters of large-scale adjustable components has problems such as large amount of calculation, repeated iterations of calculation, low design efficiency, and inability to consider all solutions in the space, and the data processing is complicated, which must be done by It is completed by experienced engineering designers, the data analysis is difficult, and the characteristic rules are not easy to extract; the optimization method based on the genetic algorithm and other optimization algorithms can quickly obtain the optimization result, but this method is similar to the optimization "black box" and cannot be adjusted. The influence process and law of component adjustment on steady-state performance is not conducive to the study of variable cycle engine characteristics

In addition, in engineering, it is necessary to combine the engineering reality such as the difficulty of component design, and comprehensively select the optimal solution. The theoretical optimal solution is not the engineering optimal solution, so this optimization algorithm cannot meet the requirements of engineering applications.

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