Research on the influence of different velocities on the formation characteristics of supercavity in underwater high-speed projectiles
The formation process of supercavitation of underwater high-speed projectiles at different speeds was simulated based on the homogenous equilibrum multiphase theory by using commercial CFD Code Fluent14.The results of the simulation show that, the development process of the cavitation phenomenon is different between the projectile head and the projectile cylinder.The water vapor content on the projectile head rises directly to the maximum, and the water vapor content on the cylindrical region of the projectile rises into three stages: Rapid accumulation period, plateau period, and rapid formation period of cavitation.That is, in the projectile head area, the cavitation gradually develops in the axial direction on the surface of the projectile until it envelops the projectile head.In the area of the projectile cylindrical region, the water vapor content needs to be changed first, and then the platform period is set until the projectile head is completely surrounded by the cavitation.After the rapid formation of cavitation, followed by the formation of supercavity.The faster the projectile velocity, the shorter the plateau period, the faster the formation of supercavitation, and when the velocity is higher than 1100m/s, the time required for the formation of supercavitation is almost the same.The low pressure region of the projectile cylindrical region expands faster than the projectile head, and the expansion of the low pressure region of the projectile head surface lags behind the expansion of the cavitation region.The surface pressure drop process of the projectile head is divided into a rapid decline period and a slow decline period, and at the end of the rapid decline period, cavitation begins to occur.The faster the projectile velocity, the faster the pressure drop and the higher the pressure at which the cavitation occurs.The surface pressure of the cylindrical part of the projectile is similar to a straight line drop.After the end of the decline, the cavitation phenomenon begins to occur, and the faster the projectile velocity, the faster the pressure drop.
Fluid mechanics Natural supercavitation Numerical simulation Formation characteristics
Yu-bo HU Yong-gong YU
School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing, China
国际会议
2018 International Conference on Defence Technology (2018国际防务技术会议)
北京
英文
871-875
2018-10-21（万方平台首次上网日期，不代表论文的发表时间）