海底边界对水下管线的水动力影响   总被引：1，自引：0，他引：1  

鄂学全  李战华  凌国灿 《海洋工程》1989,(1)

本文叙述了在定常流中,用平板模拟海底平面边界,在雷诺数R_e为4.0×10~3～1.5×10~5范围内,测量了孤立圆柱和离平板不同距离上的单柱的阻力(C_D)、升力(C_L)、上抬力(C_(LO))等水动力系数和响应频率f。研究了管道距平板边界的相对间距H/D(H为圆柱与平板之间的间距;D为圆柱直径)对水动力特性的影响。  相似文献   

Control of Vortex Shedding at Moderate Reynolds Numbers   总被引：1，自引：0，他引：1  

SHAO  Chuanping 《中国海洋工程》2002,16(1):61-68

The suppression method of vortex shedding from a circular cylinder has been studied experimentally in the Reynolds number range from 300 to 1600. The test is performed in a water channel. The model cylinder is 1 cm in diameter and 38 cm in length. A row of small rods of 0.18 cm in diameter and 1 .5 cm in length are perpendicularly connected to the surface of the model cylinder and distributed along the meridian. The distance between the neighboring rods and the angle of attack of the rods can be changed so that the suppression effect on vortex shedding can be adjusted. The results show that vortex shedding can be suppressed effectively if the distance betvveen the neighboring rods is smaller than 3 times and the cylinder diameter and the angle of attack is in the range of 30°≤β < 90°  相似文献   

自升式综合平台的外载计算     

凌国灿  郑之初  鄂学全  傅仙罗 《海洋工程》1990,(2)

本文给出了自升式综合平台的外载估算方法。对大尺度物体的波浪载荷用三种方法进行了计算,在计算中考虑了非线性波的影响和局部修正。本文在给定的设计波参数和海况条件下,对南海北部湾和渤海地区的自升式综合平台(方案)进行了风、浪、流外载计算。计算结果用于平台结构强度、疲劳、稳定性分析和沉块的优化设计。  相似文献