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在油气田开发后期,海洋立管系统易出现段塞流,对海洋平台危害巨大,而波纹管能够有效调节流型消除段塞流.建立波纹管数值模型,通过对波纹管内部流动进行模拟,验证了该模型的准确性,分析了波纹管对分层流的流动调节作用,对比不同结构参数波纹管的流动调节效果,并对波纹管的结构参数进行了优化.结果表明:波纹管能够将分层流调节为非分层流,从而消除强烈段塞流,是一种有效的被动消除法;在一定的安装空间下,波纹管的标准弯管数量越多,向心力方向的改变次数越多,流动调节作用越显著;流体流速增加,惯性力增强,向心力造成的扰动作用减弱,波纹管出口物流分配的均匀性降低;工程实践中,弯曲中心角取90.既便于标准弯管的加工,又能满足流型调节的要求,标准弯管数目的确定应根据安装空间和投资要求综合考虑.“,”At the late stage of oil and gas field development,slug flow tends to form in ocean riser systems,and leads to great damage on marine platforms.The slug flow can by eliminated by bellows,which can regulate the flow patterns effectively.In this paper,the numerical model of bellows was built up and its accuracy was verified by performing numerical simulation on internal flow of bellows.Then,the regulating effects of bellows on stratified flow were analyzed and the flow regulating results of bellows with different structural parameters were compared.And finally the structural parameters of bellows were optimized.It is shown that bellows can eliminate severe slug flow by converting the stratified flow into the non-stratified flow.It is an effective passive elimination method.With the certain installation space,the more there are normal bends in bellows,the more frequently the centripetal force direction changes and the more significantly the bellows regulate flow patterns.With the increasing flow rate of the fluid,inertial force is increased,the disturbance caused by the centripetal force is weakened,and the flow at the exits of bellows is distributed less evenly.In the practical engineering,the reasonable value of the bending central angle is 90°,which is convenient for the processing of normal bends and satisfactory for the regulation of flow patterns.The number of normal bends shall be confirmed comprehensively according to the installation space and the investment requirements.