基于弹炮间隙的水下枪内弹道建模与实验研究

Modelling and Experimental Study of Interior Ballistics for Underwater Guns in View of Clearance Between Projectile and Barrel

基于水下超空泡射弹武器的发射机理及结构特点,采用气体动力学理论,针对全水下发射方式高膛压、低初速的问题进行改进。建立计及弹炮配合间隙及气液两相相互作用的水下枪内弹道模型,运用四阶龙格-库塔法进行数值求解,得到了发射过程中膛压和射弹速度的变化规律,分析了间隙的有无对内弹道特性的影响。设计了实弹射击实验,验证了内弹道模型的正确性。计算结果表明:在全水下发射方式的基础上考虑弹炮配合间隙,能够有效降低膛压并提高射弹初速度。

Based on the launch mechanism and structure characteristics of the supercavitation projectile weapon system, the high chamber pressure and low initial velocity problem of underwater launching was improved through the use of the gas dynamics theory. The interior ballistic model in view of cleara-nce between projectile and barrel and gas-liquid interphase effect of the equipment in the launch process was established, with numerical value of the model worked out with the fourth-order Runge-Kutta method. Through the numerical analysis of the interior ballistic process, the laws of pressure inside barrel and projectile velocity during the launching process were obtained with the effect of cleara-nce on internal ballistic characteristics analyzed. Finally, a live firing experiment was designed to compare and verify the correctness of the internal ballistic model. The result shows by considering the clearance on the basis of undewater launching mode can effectively reduce the pressure inside barrel and increase the initial velocity of the projectile.