摘要
研究了不同长细比圆柱体水下运动产生空泡的形态及带空泡绕流的阻力。长细比不影响圆柱体产生的空泡形态。圆柱体绕流从局部空泡发展到超空泡绕流后,压差阻力系数减小,摩擦阻力系数减小至趋于零,总阻力系数几乎和压差阻力系数一样。空化数较高时,随长细比增大,阻力系数先减小后增大;空化数较小时,相同空化数条件下,其阻力系数基本趋于一致,空化数越小,阻力系数越小。
The Numerical simulation and experimental investigations have been carried out on the drag characteristics and cavity shapes of circular cylinders moving in cavitating flow regime.It is shown that the differences of cavity shapes at different aspect ratios are not apparent,but the differences of drag coefficients at different aspect ratios are apparent.As the flow of an underwater circular cylinder developed from a part cavity to a supercavity,the pressure difference drag decreased,and the viscous drag decreased to almost zero.The total drag was same as the pressure difference drag.At a larger cavitation number,the drag coefficient decreases firstly and then increases with the aspect ratio increasing.At a smaller cavitation number,the drag coefficient has an identical trend.For a given aspect ratio,the smaller the cavitation number is,the smaller the drag coefficient is.
出处
《工程力学》
EI
CSCD
北大核心
2010年第A01期11-14,共4页
Engineering Mechanics
关键词
流体力学
水下圆柱体
轴向绕流
长细比
空泡形态
阻力特性
fluid mechanics
underwater circular cylinder
axial cavitating flow
aspect ratio
cavity shape
drag character
