Aeroengine Overall Performance Design Optimization Based on Nonlinear Weighting Method
To solve the problem of subjective interference of designers and difficulty in determining the weight coefficients during engine modification or performance optimization,a gas turbine engine was taken as the research object,the net thrust(FN),specific fuel consumption(SFC)and the minimum cross-sectional area of the nozzle(A8)were taken as the optimization target parameters,and the sensitivity analysis method was used to solve the objective weight,and the comprehensive weight was calculated by combining the Entropy Weight Method,and the overall performance optimization research was carried out based on the nonlinear weighting method.The results show that the comprehensive weights of SFC,FN,and A8 are 0.5204,0.26125,and 0.21835,respectively,of which SFC accounts for the largest comprehensive weight,indicating that the optimization of SFC can give full play to betterthe performance of the engine,and SFC optimization is relatively easier and less expensive.The design values of the overall engine performance parameters(SFC,FN,A8)have 5.32%,0.67%,and 3.25%optimization space respectively,indicating that under the premise of little change in thrust,it can be optimized according to the idea of greatly reducing fuel consumption and reducing A8.The optimization result not only overcomes the shortcomings of subjective factors interference of previous designers,but also meets the current component design level of the engine and the requirements of cost optimiza-tion,which can provide an effective basis for designers to make target trade-offs in the engine scheme design stage.
万方数据
维普
