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翼身结合处的整流在民机气动中有很重要的作用,需要设计合适的外形以调整机翼上表面的压力分布及翼身结合处的气流,达到提高大型民用客机翼身组合体气动性能的目的。基于CATIA的自由曲面修形技术,采用自由曲线B样条的参数化方法,综合考虑工程约束(起落架布局),对民机构型翼身结合处进行了整流设计,并采用求解N-S方程的方法计算样本点,利用基于响应面的遗传算法对其进行优化。设计状态阻力减小了2.21%,达到了提高翼身组合体气动特性的目的。结果显示这种应用于复杂三维曲面的建模方法具有一定的工程应用价值。
The rectification of the wing body junction plays an important role in the aerodynamics of civil aircraft. It is necessary to design a suitable shape to adjust the pressure distribution on the wing surface and the airflow at the wing body to improve the aerodynamic performance of the wing body assembly of a large passenger plane the goal of. Based on the CATIA freeform surface modification technique, a parameterized method of free-form B-spline is adopted and the structural constraints (landing gear layout) are taken into consideration in order to rectify the wing junction of civil aircraft. The method of solving NS equations The sample points are calculated and optimized using a genetic algorithm based on response surface. Design state resistance decreased by 2.21%, to achieve the purpose of improving the aerodynamic characteristics of the wing body assembly. The results show that this method applied to the modeling of complex three-dimensional surface has certain engineering value.