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在高M数和小攻角α下钝锥体外形都存在最佳钝度比(R_N/R_B)~*,使其压心系数达到高峰值。在再入飞行器外形设计中可以利用这一特性使所选择的外形有较好的飞行力学性能,如可减少滚动共振出现的概率等。文中给出确定最佳钝度比的经验公式,提出了重阻比β的定义;并推荐计算落速的近似公式。最后,利用最佳钝度比的思想,提出了再入飞行器气动力外形的最优化设计方法。
Under the condition of high M number and small angle of attack α, there is an optimal ratio of blunt cones (R_N / R_B) ~ *, so that the pressure center coefficient reaches a peak value. In re-entry vehicle design can take advantage of this feature makes the shape of the selected flight have better mechanical properties, such as reducing the probability of rolling resonance occurs. The paper gives the empirical formula to determine the best ratio of bluntness, and puts forward the definition of the ratio of heavy resistance β; and recommends the approximate formula for calculating the falling speed. Finally, the optimal design method of aerodynamic shape of reentry vehicle is put forward by using the idea of optimal ductility ratio.