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本文提出了用直接优选法设计最大推力喷管型线的方法。喷管型线是按具有一固定初始膨胀型线的二次多项式造型的。借直接优选法改变多项式系数来确定最大推力型线。考虑了三种直接优选法:多维线性搜索法,最速下降法和牛顿法。文中提供了计算结果,用以阐明这三种直接优选法的特征,并证明了二次多项式型线所产生的推力基本上与变分法计算确定的喷管型线所产生的推力是一致的。
This paper presents a method of designing the maximum thrust nozzle profile by direct optimization method. The nozzle profile is modeled as a quadratic polynomial with a fixed initial expansion profile. Change the polynomial coefficient by the direct optimization method to determine the maximum thrust profile. Three direct optimization methods are considered: multidimensional linear search method, steepest descent method and Newton method. The calculation results are provided to illustrate the characteristics of the three direct optimization methods and demonstrate that the thrust produced by the quadratic polynomial line is essentially consistent with the thrust produced by the variational method of determining nozzle profiles.