摘要
针对目前鱼雷入水初始弹道计算不准确的问题,对鱼雷入水过程中涉及的机理性问题进行了分析。基于无网格的优势,采用有限元法(FEM)/光滑质点动力学(SPH)耦合方法,对鱼雷斜入水大姿态运动过程进行了仿真。通过试验数据验证了仿真模型的正确性,并分析了鱼雷斜入水过程的忽扑现象。计算了不同工况下低压力的数值,并通过理论公式进行了验证。研究结果表明,鱼雷斜入水后雷头下部易产生低压效应,造成大姿态的低头运动。造成忽扑现象的低压力受入水攻角的影响较大,负攻角工况低压力数值比正攻角大,且持续作用时间长。所以需要充分考虑低压力的影响,才能更准确的对鱼雷入水弹道问题进行分析和设计。
To solve the problem of inaccurate calculation of torpedo＇s initial trajectory, the water entry mechanism of a torpedo is analyzed. Based on the advantage of meshless method, finite element method（FEM）/smoothed particle hydrodynamics（SPH） coupling method is used to simulate torpedo＇s large attitude motion process during oblique water entry. The correctness of the simulation model is verified by the experimental data. The whip phenomenon of torpedo during oblique water entry is analyzed, and the values of low pressure under different conditions are calculated and verified by theoretical formula. Results show that when a torpedo is entering into water, the area part under the torpedo head is trend to produce low-pressure effect, resulting in large-attitude downward motion and the whip. The low pressure causing the whip phenomenon is significantly affected by the angle of attack. The low-pressure value is larger and the duration of action is longer in the negative attack angle condition, compared with those in the positive attack angle condition. Therefore, in order to more accurately analyze and design the torpedo trajectory during water entry, the effect of the low pressure is necessary to be considered.
作者
张岳青
蔡卫军
李建辰
王志杰
庞多
ZHANG Yue-qing;CAI Wei-jun;LI Jian-chen;WANG Zhi-jie;PANG Duo(The 705 Research Institute, China Shipbuilding Industry Corporation, Xi＇an 710077, China)
出处
《水下无人系统学报》
北大核心
2018年第2期146-151,共6页
Journal of Unmanned Undersea Systems
关键词
鱼雷
入水
忽扑现象
有限元法
光滑质点动力学(SPH)
耦合方法
torpedo
water entry
whip phenomenon
finite element method（FEM）
smoothed particle hydrodynamics（SPH）
coupling method
