基于模型试验的实尺度立管涡激振动响应预报方法研究

Full scale riser Vortex-Induced-Vibration response prediction based on model test

为了研究立管涡激振动模型试验与实尺度立管涡激振动响应之间的相互关系问题,文章从模型试验的相似理论出发,基于涡激振动预报方法的理论分析;通过对模型试验中按照相似理论换算得到的流速进行调整的方法,改变模型立管的涡激振动响应,并逼近实尺度立管的涡激振动响应。结果表明:通过调整试验流速,提高试验的雷诺数,可以使立管模型的涡激振动响应模态数、无量纲振幅RMS(A/D)响应与实尺寸立管很好地符合。针对不同的缩尺比模型,给出了立管模型试验流速与其模拟的真实流速之间的对应关系式。

To study the relationship between the model test results and the full scale responses of the Vortex-Induced-Vibration （VIV） of the riser, the strategies of the modification of the model test velocity are investigated. Base on the numerical VIV prediction theory, similarity theory analysis of the model test, the modification strategies of the model test velocity are found and verified by plenty of numerical simulation cases. The result shows that the mode number and response RMS （A/D） of the riser model will have a good agreement with those of the full scale riser,if the model test velocity is modified, and therefore the Re number in the model test is increased. As a study case, the relationship between the full scale velocity and the model test velocity is finally given out by a curve fitting function.