【摘要】 针对超空泡射弹在水下航行过程中的运动稳定性问题，本文基于耦合欧拉—拉格朗日（CEL）方法，在对射弹尾拍航行的数值模拟、尾拍水动力载荷特性分析的基础上，对射弹的尾拍稳定机制进行研究，通过尾拍初始攻角、尾拍最大攻角、失稳临界攻角对射弹尾拍过程进行表征，并揭示超空泡航行稳定性与攻角的关系。而后，对本文锥台形式的射弹的航行稳定性进行评估，通过对其尾拍航行过程中压心位置变化的典型过程、射弹的静稳定度的分析表明，此超空泡射弹总体符合常规无控弹箭的12%～20%静稳定度要求。最后，本文得到超空泡射弹的外形设计需满足的空泡空间约束、尾拍航行稳定性约束以及静稳定度约束原则，进而从尾拍位置、尾拍范围的控制角度，对往复大扰动射弹的外形设计提出建议。更多还原

【Abstract】 In this paper, numerical simulation of projectile’s underwater motion process with tail-slaps was studied based on CEL(coupled Eulerian-Lagrangian analysis) method. The stability principle of projectile’s motion with tail-slaps was studied. Some parameters, such as initial angle of attack when tail-slaps occurred,maximum angle of attack, and instability critical angle of attack were used to characterize the projectile’s tail-slap. The relationship between stability and angle of attack was revealed. The location change of pressure center caused by projectile’s tail-slap was studied, too. The results showed that the static stability margin of projectile was enough to meet its stability requirements. Finally, three constraint criteria for the motion stability of projectile, including the requirement for the size of cavity, the relative location of center of pressure and center of mass, and the static stability margin of projectile, were obtained. The location and area of tail-slap can be used to control the static stability margin of projectile, some suggestions for the design of projectile’s shape were proposed, too.更多还原