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非圆截面弹体外形具有更好的气动性能、较大的配平升阻比和配平升力、较轻的质量、较大的容积.选取了4个对非圆截面弹体外形影响明显的设计变量,利用数值模拟的方法研究不同设计变量对其气动特性的影响.同时,提出了旨在提高优化计算效率的响应面方法,并采用Pareto遗传算法对目标函数进行优化求解.研究结果表明,在弹体横截面积不变的情况下,头部波阻在跨声速时占总阻力的一半以上,增大头部长细比与头部倾斜角能有效降低头部波阻.同时,合理配置尾部直径比与尾部倾斜角,可抑制尾部引起的流动分离,降低底部阻力.
Non-circular cross-section projectile shape has better aerodynamic performance, larger trim drag ratio and trim lift, lighter mass, larger volume.Selected four design variables , The influence of different design variables on the aerodynamic characteristics was studied by means of numerical simulation.At the same time, a response surface method was proposed to improve the efficiency of optimization calculation, and the Pareto genetic algorithm was used to optimize the objective function.The results show that, Body cross-sectional area unchanged, the head wave resistance in transonic speed accounted for more than half of the total resistance, increase the head slenderness and head tilt angle can effectively reduce the head wave resistance.At the same time, the rational allocation of tail diameter ratio Tail angle with tail, can inhibit tail-induced flow separation, reducing the bottom resistance.