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目的研究拉格朗日假设条件下随行装药的膛内压力分布规律. 方法采用能量与动量守恒的方法进行研究. 结果分析了随行装药的膛内物理过程,导出了随行装药弹后气流速度分布公式及随行装药弹丸的动量方程,推导了拉格朗日假设条件下随行装药弹后空间压力分布规律的数学表达式,并从理论上比较了随行装药与常规装药弹底压力的大小. 结论随行装药的膛内压力分布可以进行理论预测,其膛内压力分布曲线具有抛物线形状.“,”Aim To study the rules governing pressure distribution of traveling charge under the condition of Lagrange hypothesis. Methods The study is based on the laws of conservation of momentum and energy. Results The gas flow velocity distribution formula at the back of a projectile and the momentum equation of a traveling charge are deduced, and rules governing their pressure distribution under the Lagrange hypothesis conditions are established. The pressure distribution of a traveling charge is compared with that of a conventional charge. Conclusion The pressure distribution in the bore of a traveling charge can be accurately predicted. A parabolic pressure distribution type is revealed.