文献类型： 会议论文

第一作者： Hao WU

作者： Hao WU ¹ ; Bin TENG ¹ ; Dapeng SUN ¹ ; Jianqiao ZHANG ² ; Lin LU ³ ; Bin XIE ⁴ ;

作者机构： 1.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology

2.Fishery Engineering Research, Institute of Chinese Academy of Fishery Sciences

3.Center for Deepwater Engineering, Dalian University of Technology

4.CNOOC Research Center

会议名称： International Conference on Ocean, Offshore and Arctic Engineering 2010 (OMAE2010)

主办单位：

页码： 687-694

摘要： Experimental investigations on a passive control method for suppressing VIV of long flexible riser are presented in this work. A riser model with L/D (slenderness ratio) of 1750 was horizontally installed on a carriage and uniform current was simulated by towing the riser using the carriage in a wave tank, which leads to the Reynolds numbers ranging from 10~3 to 10~4. Four slender control rods with diameter d=0.25D were placed parallel to the riser at uniform angle (i.e. at 90° intervals around the riser circumference). Different pitch distances l/D=0.813, 1 and 1.188 were considered in this work, where l is the center-to-center distance between control rod and riser model. Strain along the riser and tension were measured by Fiber Bragg Grating and tensionmeter, respectively. The experimental results indicate that the response characteristics of a riser model with multiple control rods are quite distinct from that of a bare riser. Multiple control rods can suppress VIV response significantly, and their performance is mainly dependent on the pitch distance. It is found that the spatial maximum standard deviation of strain decreases about 84% due to the existence of control rods. The optimal pitch distance is found to be l/D≤1. Moreover, spectrum analysis shows that the dominate frequency increases linearly with the increasing of flow velocity, for both the bare riser and the riser with control rods, while the frequency band of the suppressed riser becomes broader compared with the bare riser. It is also observed that the tension of the riser is slightly increased due to the presence of four rods, but not sensitive to the pitch distance.

分类号： P75-53