柔性立管涡激振动抑制装置试验研究

摘要

Laboratory tests were conducted on the helical strakes of a riser in order to further improve the understanding of the response performance of VIV of the riser with helical strakes.The experiment was accomplished in a towing tank and the relative current was simulated by towing the flexible riser in one direction.Based on the modal superposition method,the displacement responses were obtained by means of the measured strains.The strakes with different pitches were analyzed,and the response parameters like strain response and displacement response were studied. The analysis indicates that the in-line response is as important as the cross-flow response.The results also show 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 geometrical configuration of the helical strakes closely.%为深入研究带螺旋列板的柔性立管涡激振动响应特性，进行立管螺旋列板抑制装置的拖曳水池试验。由拖车拖动立管产生来流测得应变数据，基于模态叠加法获得立管位移响应等参数。分析螺旋列板抑制装置的螺距变化，系统研究不同螺旋列板状态下立管应变、位移响应等参数。结果表明，流向响应与横向响应同样重要不可忽略；裸管响应特性与带螺旋列板的立管响应特性区别较大，响应特性与螺旋列板几何形状紧密相关。