波流共同作用下近底子母管线的水动力特征

The Hydrodynamic Characteristic of Submarine Composite Pipeline in Wave-Current Coexisting Field

基于波－流相互作用理论和模型试验，对海底子母管这一特殊结构型式在规则波、特别是在不规则波与流共同作用下的水动力特征进行了系统研究。采用“变径法”分析得到子母管系统的正向力的水动力系数，它们与ＫＣ数有良好的相关性。不规则波与规则彼的对比试验显示两者的水动力系数在９０＞ＫＣ＞２０范围内可得到统一。试验着重分析了水深因子的影响，给出的ＣＤ、ＣＭ～ＫＣ关系曲线，可供工程设计参考。

Compeite Plpeane is d6fined as a Pipeline system ho cormposed of one big pipe and one or several small pipe.Based on the theory of wave-current interaction and physical molel test, the hydsodynaha characteristic of submarinecomghtepipeline in wave- current coexistiong field (both requlat and irtequfor waves) was investignted. The so- called'modified diameter method' iS used for analyzing the in-line hydrodynandc coefficientS of composte peline, which is well related tO KC numbly. The compeison of tested data in regutat and irregular waves shows that in the region of 90> KC >20, the results in these two cases be edied. The effed of water depth was analyzed in detailed. The relationship between Ca, Cm and KC, which is based on the results of Prest rourch, may be used as a reference for engineering aPPlication.