| 摘要: |
| 航行器以一定速度入水过程中将发生空化现象，这对其受力特性及运动轨迹都有重要影响，是跨介质航行器的关键问题。针对航行器不同速度垂向入水中的空化现象开展了数值模拟研究，采用整体运动网格方法，分析了航行器垂向入水过程中，空化和入水速度对运动特性及流场演化的影响。研究结果表明，超空泡主要从航行器外形斜率改变处开始生成，空泡的闭合与溃灭都会造成受力曲线的较大波动。超空泡的减阻效果主要在航行器完全进入水面后体现，且航行器垂向入水速度越大，阻力系数越小。 |
| 关键词: 跨介质航行器 入水冲击 空化 超空泡 数值模拟 |
| DOI： |
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| 基金项目:国家自然科学基金（12372272） |
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| Research on Cavitation Influence of Vehicles Vertical Water Entry Characteristic |
| LI Shaliang,LIU Bing,TIAN Yu,LI Shibin |
| (1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;2. School of Aerospace Science and Engineering, Beihang University, Beijing 100191, China) |
| Abstract: |
| Cavitation phenomenon occurs during the certain-speed entry of the vehicle into the water, which has an important impact on the force and trajectory characteristics, and it is the critical problem of trans-medium vehicles. Numerical simulation is conducted on the cavitation phenomenon of vehicles entering water vertically at different speed. The impact of cavitation and water entry speed on the motion characteristics and fluid field evolution of the vehicle during its vertical entry into water is analyzed. The research results show supercavitation occurs mainly when the slope of the vehicle shape changes. The closure and collapse of cavities will cause the force curve to be larger fluctuations. The drag reduction effect of supercavitation is mainly reflected after the vehicle completely enters the water surface, and the greater the vertical speed of the vehicle entering the water, the smaller the resistance coefficient. |
| Key words: Trans-medium vehicle Water-entry impact Cavitation Supercavitation Numerical simulation |