中文摘要：

研究了水下圆柱体带空泡轴向绕流问题.用数值方法研究了不同长细比圆柱体水下运动产生空泡的形态及圆柱体水下带空泡绕流的阻力特性,圆柱体绕流空泡形态以及阻力系数数值计算结果与试验对比,符合较好.圆柱体长细比对空泡形态影响可以忽略.随长细比增大：空化数较高时,阻力系数先减小后增大;空化数较小时,其阻力系数基本保持不变.小空化数条件下,给定长细比,空化数越小,阻力系数越小.

英文摘要：

The axial cavitating flow around underwater circular cylinder is investigated in this paper.Under the conditions of different slenderness ratio of circular cylinder,the cavity shape and the drag characteristics are investigated numerically.The numerical results of the cavity shape of the cavitation flow around the circular cylinder and the drag coefficients of the circular cylinder agree well with the experimental ones.The effect of the slenderness ratio on the cavity shape is neglectable.As the slenderness ratio increases,the total drag coefficient decreases,and then increases at big cavitation number;the total drag coefficient almost keep invariant.Under the condition of small cavitation number and given slenderness ratio,the smaller cavitation number is,the smaller total drag coefficient is.