发动机短舱型线的多目标优化设计

Multi-objective Optimization Design of Engine Nacelle Profiles

为了提高亚声速客机发动机短舱的气动性能,开展了短舱内、外型线的多目标优化设计。采用贝塞尔曲线和形函数方法对短舱型线进行参数化设计,通过RANS数值模拟获得气动性能,以摩擦阻力和总压恢复系数作为目标函数,结合径向基函数模型和带精英策略的非支配排序遗传算法,成功获得了短舱型线的优化设计几何。经数值模拟分析验证,该优化型线设计可以明显改善短舱内、外流场,有效降低短舱外部的摩擦阻力,提高短舱内部的总压恢复系数。

In order to improve the aerodynamic performance of the subsonic aircraft engine nacelle, the multi-objective optimization design of nacelle profiles was developed. The internal and external profiles were parameterized by using Bezier curve and Class-Shape-Transformation. The aerodynamic performances were obtained by RANS numerical simulation. The frictional resistance and the total pressure recovery coefficient were proposed as the multi-objective functions. Combining with Radial Basis Function model and Non-donimated Sorting Genetic Algorithm, the optimization design of nacelle profiles was obtained. The numerical simulation analysis proves that the optimized design can significantly improve the flow field inside and outside the nacelle, effectively reduce the external friction resistance, and increase the total pressure recovery coefficient inside the nacelle.