Experimental Study on Response Performance of VIV of A Flexible Riser
with Helical Strakes |
| |
| Authors: | GAO Yun FU Shi-xiao CAO Jing and CHEN Yi-fan |
| |
| Institution: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University,
Chengdu 610500, China;State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;CNOOC Research Center, Beijing 100027, China;Mechanical Engineering School of Engineering, University of Kansas, Lawrence, Kansas 66045, USA |
| |
| Abstract: | Laboratory tests were conducted on a flexible riser with and without helical strakes. The aim of the present work is to further understand the response performance of the vortex induced vibration (VIV) for a riser with helical strakes. The experiment was accomplished in the towing tank and the relative current was simulated by towing a flexible riser in one direction. Based on the modal analysis method, the displacement responses can be obtained by the measured strain. The strakes with different heights are analyzed here, and the response parameters like strain response and displacement response are studied. The experimental results show that the in-line (IL) response is as important as the cross-flow (CF) response, however, many industrial analysis methods usually ignore the IL response due to VIV. The results also indicate that the response characteristics of a bare riser can be quite distinct from that of a riser with helical strakes, and the response performance depends on the geometry on the helical strakes closely. The fatigue damage is further discussed and the results show that the fatigue damage in the CF direction is of the same order as that in the IL direction for the bare riser. However, for the riser with helical strakes, the fatigue damage in the CF direction is much smaller than that in the IL direction. |
| |
| Keywords: | flexible riser vortex-induced vibration helical strake response performance fatigue damage |
|
| 点击此处可从《海洋工程》浏览原始摘要信息 |
| 点击此处可从《海洋工程》下载免费的PDF全文 |
|
