基于混合网格的声爆/气动一体化设计方法研究

Optimization of sonicboom and aerodynamic based on structured/unstructured hybrid grid

探索了基于混合网格的近场预测以及基于波形参数法的远场预测相结合的声爆预测方法,综合利用了结构化网格计算效率高以及非结构网格对复杂外形适应性好的优点,在保证声爆预测精度的基础上提高了计算效率。在此基础上,建立了基于声爆预测方法、响应面模型和Pareto遗传算法的声爆/气动一体化设计方法。分析表明,发动机短舱对超声速升阻特性和声爆特征都有较大影响,利用声爆/气动一体化设计方法对发动机短舱位置进行了一体化设计研究。结果表明,建立的响应面模型的精度完全满足要求,根据不同的设计偏向选择了三种优化方案,优化后方案的性能较原始方案都有不同程度的提高。

High fidelity sonic boom prediction method is developed based on near field CFD method and far field waveform parameter method.The structured/unstructured hybrid grid is set up to use both advantages for more accurate and efficient sonic boom prediction.And then the optimization method is constructed by coupling high fidelity sonic boom prediction method,response surface model and Pareto genetic algorithm.It can be found that nacelle has significant influence in sonic boom level and aerodynamic performance.The location of nacelle is optimized by using the sonic boom and aerodynamic optimization method. The design results indicate that response surface model can satisfy the requirement of precision.Three optimized layouts are chosen by different preferences in Pareto front.Through optimization,the sonic boom level and aerodynamic performance are improved.