利用DCD(dispersion controlled dissipative scheme)格式,提出了一种研究发射装药发射安全性问题的两相流内弹道计算方法。将内弹道气固两相流动力学方程组中与压力有关的项进行变形,实现了用同一种格式对气相和固相统一处理,而无须分别对待,采用DCD格式无须数值粘性和人工滤波,提高了计算精度。实例计算了某榴弹内弹道两相流动力学,计算结果与实验结果吻合较好。把破碎发射药床视为混合装药结构,用DCD格式计算了发射药床不同破碎程度对发射安全性的影响。计算结果表现出了通常计算方法难以反映的破碎发射药床内弹道压力极为剧烈的变化过程和极高的危险膛压。 更多还原
A new computational method of two-phase flow interior ballistics which can be used to study the launch safety problem of propellant charge is put forward based on the DCD scheme. By rewriting the form of items about pressure in dynamics equation group of gas-solid two-phase flow,the uniform disposal of gas and solids with the same scheme are realized,and it does not need to treat them respectively. It does not need artificial filtering or numerical viscosity while using the DCD scheme,so the computational accuracy is improved. In an instance the two-phase flow interior ballistics of a howitzer is computed,the computational results agree with the test results. The influence of different fracture degree of propellant charge on launch safety is numerically simulated by the DCD scheme,in which fractured propellant charge bed is considered as a mixed charge configuration. The barrel pressure evolvement and dangerous barrel pressure,which are difficult to be reflected by the computational methods,appear in the computational results for interior ballistic of fractured propellant charge bed.