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根据大口径榴弹炮复杂装药结构的特点，将膛内流域分为４个区：燃气区、管状药区、基本药包粒状药区与附加药包粒状药区，每个区分别推导质量、动量与能量守恒方程，建立了多相流内弹道理论模型。结合工程背景，数值预报了弹丸运动加速度变化规律，为弹丸设计提供理论指导。与部分试验结果比较表明，数值计算结果与试验结果一致性很好，预测结果是可靠的。数值预报给出内弹道循环过程详细结果，对于指导装药设计、身管设计都具有重要意义。
According to the characteristics of the complex charge structure of the large-caliber howitzer, the billet basin is divided into four zones: gas zone, tubular drug zone, granular medicine zone of basic medicine package and granular medicine zone of additional medicine package. The mass, momentum And the energy conservation equation, a multiphase flow interior ballistic theory model is established. Combined with the engineering background, the regularity of projectile motion acceleration is predicted by numerical analysis, which provides theoretical guidance for projectile design. Comparison with some of the test results shows that the numerical calculation results are in good agreement with the test results and the prediction results are reliable. The numerical forecast gives the detailed result of the inner ballistic circulation process, which is of great significance for guiding the charge design and the design of the barrel.