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从流体动力角度研究了不同发射深度下，导弹水下点火这一非定常非线性过程。整个系统分为外部水流场、喷管流场和燃气泡流场三个区域加以考虑。水流场采用不可压势流模型，用边界元方法求解；喷管内流场采用非定常一元流动模型，用特征线差分法求解，并设置了激波检测功能；燃气泡采用基于质量和能量守恒的零维计算模型。在时间域中用步进方法实现了三个流场的耦合求解。给出了四种发射深度下的数值计算结果，展示了导弹水下点火的一些重要特征。
From the perspective of fluid dynamics, the unsteady nonlinear process of missile underwater fire under different launching depths is studied. The whole system is divided into external water flow field, nozzle flow field and gas bubble flow field three areas to be considered. The flow field is solved by the boundary element method in the incompressible potential flow model. The unsteady flow field in the nozzle is solved by the characteristic line difference method and the shock detection function is set. The gas bubble is based on the mass and energy conservation Zero-dimensional computing model. In the time domain using the step-by-step method to achieve the coupling of three flow field solution. The numerical results of four kinds of launching depth are given, and some important characteristics of missile underwater fire are demonstrated.