基于响应面法的超燃冲压发动机进气道多目标优化

基于响应面法进行了二维混合压缩超燃冲压发动机进气道的多目标优化研究.采用均匀试验设计确定试验方案,运用计算流体动力学求解进气道的性能.根据分析结果构造了响应面近似模型,该模型采用了完全二阶多项式模型.通过响应面近似模型的优化,实现了超燃冲压发动机进气道优化,得到了Pareto最优集.结果表明,采用均匀试验设计和响应面法可以大大减小数值模拟的计算量,提高优化效率.

SCRAM JET INLET MULTI-OBJECTIVE OPTIMIZATION BASED ON RESPONSE SURFACE METHODOLOGY

The uniform design and response surface methodology (RSM) are applied to the multi-objective optimization of a 2-D mixed compression scram jet inlet. The set of experimental design points on the design space is selected by the uniform design, and the inlet performance is analyzed by computational fluid dynamics (CFD).Then complete quadratic polynomial response surface approximation models are constructed based on the performance analysis results and then used to replace the original complex inlet performance model. The optimization is conducted using a multi-objective genetic algorithm NSGA-Ⅱ, and the Pareto optimal solution set is obtained.Results show that the uniform design and RSM can reduce the computational complexity of numerical simulation and improve the optimization efficiency.