基于CEL方法的射弹高速入水数值研究  

Numerical simulation of projectile’s high-speed water-entry process based on CEL method

作　　者：王晓辉 李鹏[1] 孙士明[1] 闫铭 WANG Xiao-hui;LI Peng;SUN Shi-ming;YAN Ming(China Ship Scientific Research Center,Wuxi 214082,China;College of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]上海大学力学与工程科学学院,上海200444

出　　处：《船舶力学》2022年第1期11-17,共7页Journal of Ship Mechanics

摘　　要：针对超空泡射弹火炮武器在航空反水雷作战中的应用,本文基于耦合欧拉—拉格朗日(CEL)方法对射弹高速入水过程进行了数值模拟,重点对入水空泡的捕捉精度问题进行了研究。对于平头射弹而言,采用刚体壳单元进行几何离散、求解,由于双侧接触问题会使入水空泡的捕捉失真。基于对壳单元双侧接触形成机理的分析,获得了改善射弹高速入水空泡捕捉精度的方法。通过射弹入水后的超空泡形态与试验、理论研究结果的对比,表明了CEL方法对高速入水数值求解的有效性;进而通过射弹带攻角垂直入水尾拍过程的数值模拟,捕捉到了与水下发射试验相近的空泡不连续演化特征。最后,对数值模拟得到射弹尾拍载荷特性、射弹尾拍航行状态下姿态偏转角速度变化的分析表明,射弹尾拍对其水下弹道性能有重要影响。In this paper,aiming at the application of supercavitation projectile artillery weapon in anti-mine operations,a numerical simulation of projectile’s high-speed water-entry process was studied based on CEL(Coupled Eulerian-Lagrangian analysis)method,and the accuracy of the cavity shape’s capture was studied,too.If the projectile was discretized by discrete rigid shell elements,the simulation results would be distorted due to the double-sided contact problem.Based on the mechanism analysis of the shell element’s doublesided contact problem,the method to improve the cavity shape’s capture accuracy was obtained.The comparison of the cavity shape with the experimental and theoretical results proved the CEL method’s validity in the study of high-speed water-entry.Then,through the simulation of high-speed water-entry process of projectile with an attack angle,the discontinuity of the cavity due to projectile’s stabilizing tail-slap was obtained.Finally,the analysis of the change of loads and angular velocity caused by projectile’s tail-slap obtained by numerical simulation showed that the projectile’s tail-slap has a significant influence on its hydro-ballistic performance.

关 键 词：射弹 入水空泡 CEL方法 双侧接触 尾拍 

分 类 号：O352[理学—流体力学]