摘要
采用RANS求解器,结合SST k-ω湍流模型和Sauer空化模型,数值模拟了船后螺旋桨空泡。用对称面边界条件处理自由表面,滑移网格技术处理螺旋桨旋转,时间步长为2°。螺旋桨空泡模拟结果与大型循环水槽试验结果进行了对比,虽然由于计算网格稀疏的原因没能捕捉到螺旋桨梢涡空泡,但螺旋桨空泡随空间角度的动态行为与试验观察结果吻合较好。文中还分析了船体表面空泡脉动压力与空泡体积二阶导数之间的关系,这将可以应用于螺旋桨设计过程中。
The propeller cavitation performance behind a ship was numerically simulated by using a hextetrahedral mesh based on RANS solver. The Suaer’s cavitation model based on transport equation and an SST k-ω turbulence model were coupled in the RANS solver. A symmetry boundary condition is applied on the top of computational domain instead of the free surface, which is similar to a tunnel’s wall. To observe the cavitation pattern during the revolution of a propeller, the propeller is rotated with a constant rotation angle of 2.0 degrees using a sliding mesh technique. Cavitation patterns of the simulations and hull pressure fluctuation are compared with the experimental results carried out in Large Cavitation Channel of CSSRC. Although the predicted propeller tip vortex cavity is missed because of the mesh resolution, but the predicted dynamic cavitation behaviors and hull pressure fluctuation generally well agree with experimental results. The relationship between the hull pressure fluctuation and the second order partial derivative of cavitation volume is analyzed, which will be applied to propeller design.
作者
刘登成
周伟新
LIU Deng-cheng;ZHOU Wei-xin(National Key Laboratory on Ship Vibration & Noise,China Ship Scientific Research Center,Wuxi 214082,China;Jiangsu Key Laboratory of Green Ship Technology,Wuxi 214082,China)
出处
《船舶力学》
EI
CSCD
北大核心
2019年第3期245-254,共10页
Journal of Ship Mechanics
基金
Supported by the National Natural Science Foundation of China(Grant No.11332009)
关键词
空泡
螺旋桨
船体
数值预报
cavitation
propeller
ship
numerical prediction
