| 摘要: |
| 为研究回转体倾斜入水空泡及参数变化，基于低速入水试验装置和CFD软件对该问题进行了试验和数值仿真研究。通过试验对回转体倾斜入水的空泡演变进行研究，得到了不同时刻空泡形态图。数值计算选用基于NS方程的雷诺平均（RANS）方法和基于kω的SST二方程湍流模型，建立了六自由度数值仿真方法。结果表明：数值计算得到的空泡形态与试验结果一致性较好，依次经历了撞击水面、空泡形成、颈缩、空泡断裂、空泡闭合、表面紊乱和空泡溃灭的过程。进一步分析发现速度、加速度和压力均在入水瞬间和空泡断裂时刻发生波动；偏转角度在回转体尾部刺穿空泡后增幅明显；随着入水角度增加，入水瞬间速度衰减加快、压力峰值增加,峰值出现越早，空泡闭合越难。 |
| 关键词: 倾斜入水 数值计算 六自由度 弹道 |
| DOI： |
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| 基金项目:国家自然科学基金（51579042，51639003，51709042）；青年千人项目(D1007001)；中央高校基本科研业务费专项资金（DUT16ZD218，DUT17ZD311，DUT16RC(3)085） |
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| Experimental Investigation and 6-DOF Simulation of Oblique Water-entry Cavity of Revolution Body |
| HOU Zhao,SUN Tie-zhi,ZHANG Gui-yong,ZONG Zhi |
| (Liaoning Engineering Laboratory for Deep-Sea Floating Structures, School of Naval Architecture, Dalian University of Technology;Liaoning Engineering Laboratory for Deep-Sea Floating Structures, School of Naval Architecture, Dalian University of Technology;State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration) |
| Abstract: |
| In order to investigate the problem of oblique water entry cavity and its related parameters, both experiment and numerical simulation of oblique water-entry process have been carried out. In the experiment, the cavity evolution of oblique water entry was studied and the cavity morphology at different times was obtained. The numerical model was constructed using the RANS method and SST two-equation turbulence model based on k-ω model, which can effectively simulate the 6-DOF movement of the revolution body. The results show that the cavity evolution obtained by numerical simulation agrees well with the experimental results, which mainly includes the stages of impacting water surface, forming cavity, appearing pinch off phenomenon, cavity cracking, cavity closure, coming out surface disordered and cavity collapse. The change of waterentry parameters has been further analyzed based on the numerical simulation. It was found that the velocity，acceleration and pressure all change abruptly when the revolution body impacts water surface and the cavity cracks. The body's deflection angle shows an increasing trend, which becomes more significant after the tail of the revolution pierces the cavity. With the increase of incident angle, the velocity of the revolution body decreases rapidly and the peak pressure increases greatly when the revolution body impacts water surface. Besides, the peak pressure appears earlier and the cavity is more difficult to be closed. |
| Key words: Oblique water entry Numerical simulation Six degrees of freedom Ballistic trajectory |