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中文摘要：
通过物理模型试验研究海底子母管线分别在规则波加流和不规则波加流作用下的水动力特性。基于Morison方程,采用＂等效直径法＂分析得到子母管线拖曳力系数CD,惯性力系数CM和升力系数CL（CD＋,CL-）。试验分别考察了流速比Uc/Uw,母管与海床间隙比e/D及子母管间的相对缝隙G/D对海底子母管线水动力系数的影响。结果表明水动力系数随Uc/Uw的增大而减小;当e/D〈0.5时,海床对子母管线受力的影响比较明显,CD,CM及CL＋均随e/D增大而减小,CL-随e/D增大而增大;对子母管间的相互影响也不可忽略,CD,CM和CL-均随G/D增大而减小,CL＋值随G/D增大而增大。
英文摘要：
Physical model experiments are conducted to study the hydrodynamic characteristic of submarine piggyback pipeline under regular wave-current and irregular wave-current actions.Based on Morison equation,drag coefficient CD,inertia coefficient CM and lift coefficient CL（C＋L,C-L） are obtained with the method of ＂equivalent diameter＂.In the experiments,effects of current ratio Uc/Uw,gap ratio between the large pipeline and the seabed e/D and spacing ratio between the large pipeline and the small pipeline G/D on the hydrodynamic coefficients of submarine piggyback pipeline are investigated.The results indicate that the hydrodynamic coefficients decrease with the increase of Uc/Uw.The effect of the seabed on the hydrodynamic forces on the piggyback pipeline is pronounced for e/D0.5.CD,CM and C＋L decrease with the increase of e/D,and C-L increases with the increase of e/D.In addition,the interaction between the large pipeline and the small pipeline is not negligible.CD,CM and C-L decrease with the increase of G/D,and C＋L increases with the increase of G/D.
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