本文分析流体力学的Navier-Stokes方程的解,对筒式弹在不可压流下可以近似叠加。筒式弹飞行稳定力矩是通过将气流分为轴向流和横向流分别计算后叠加而求得。本文重点建立筒式弹在台阶端面稳定力矩的计算公式,从而求得筒式弹在亚音速飞行稳定性的计算式。对反坦克破甲弹结构设计提供参考。 In this paper, we analyze the solution of the Navier-Stokes equations of hydrodynamics, which can be approximately superimposed on the incompressible flow of cartridge shells. The stability of the cartridge bombing flight is obtained by dividing the airflow into axial flow and lateral flow, respectively, and then calculating the overlay. In this paper, the formula for calculating the stability moment of the cartridge bomb at the end of the step is established, and the calculation formula of the stability of the cartridge bomb at the subsonic speed is obtained. The anti-tank armor-piercing missile structure design provides a reference.