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抑制钻井隔水管的涡激振动是海洋油气开发的一个重要课题。附属管线会改变隔水管附近的流场进而抑制隔水管的涡激振动。采用SST湍流模型数值模拟和风洞实验研究了亚临界流动区域的隔水管关键动力学因素。对于附属管中心距隔水管表面为0.2倍隔水管直径(D)的情况,研究结果表明:计算结果和实验结果较为吻合;不同布置方式和尺寸的附属管起到的抑制效果明显不同;当附属管按照4×0.1D×0o均匀排布时,抑制效果较好且管数较少,时均阻力系数和脉动升力系数均可以减少60%以上;考虑到实际工程应用中海水来流方向的易变性,发现8×0.1D的附属管总体抑制效果最好,减阻和减升分别能达到30%和70%以上。
Vortex-induced vibration damping drilling riser is an important issue for the development of offshore oil and gas. Ancillary piping changes the flow field near the riser and suppresses the vortex-induced vibration of the riser. SST turbulence model numerical simulation and wind tunnel experiment were used to study the key dynamic factors of riser in subcritical flow area. The results show that the calculated results are in good agreement with the experimental results, and the effect of the accessory tubes with different layouts and sizes is obviously different. When the subsidiary When the tube is uniformly arranged according to 4 × 0.1D × 0o, the inhibition effect is good and the number of tubes is small, the average drag coefficient and the pulsating lift coefficient can both be reduced by more than 60%. Considering that the direction of the seawater flow in actual engineering application is easy Denaturation, and found that the overall inhibitory effect of 8 × 0.1D subsidiary tube best, drag reduction and reduction can reach 30% and 70% respectively.