Traveling charge is a new technique to increase the muzzle velocity by improving the pressure curve coefficient under the same maximal pressure .For the structure of 30 mm liquid traveling charge ,the zero-dimensional model was set up , and the liquid propellant adopted the method of spray atomized combustion .To find out a better numerical model of droplet diameter ,the traditional fixed-diameter droplet model,the variable-diameter droplet model and the model of droplet diameter with normal distribution were applied respectively to numerically calculate the interior ballistics .The results show that the simulation results of three models agree well with experimental results respectively under the conditions of the maximum chamber pressure of traveling charge remaining unchanged , and the numerical model of droplet diameter with normal distribution is the best one of the three models .%随行装药是一种能在最大膛压不变的条件下，通过提高膛压曲线充满系数，从而提高弹丸初速的新型技术。针对30 mm液体随行装药结构，建立内弹道零维模型，其中随行液体药采用喷雾燃烧模型。为了寻找较好的液滴直径计算模型，分别采用定直径液滴模型、气动破碎的变直径液滴模型以及破碎液滴直径呈正态分布的模型进行内弹道数值计算。结果表明，在最大膛压保持不变的条件下，3种液滴直径模型的数值计算结果均与实验结果基本吻合，液滴直径呈正态分布的模型计算结果最接近实验值。
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