On the hypothesis of isentropic flow and quasi-steady flow,a model of gas parameters in the storage chamber is established by a method of the lumped parameters.

• 在等熵流和准定常流假设条件下,采用集总参量法,建立了弹后高压火药气体通过小孔在弹体内气室与弹后空间之间流动的气体参数理论计算模型。