串列双圆柱流致振动及能量转换特性

Flow-Induced Motion and Energy Conversion of Two Circular Cylinders in Tandem

采用二维非稳态RANS方法结合Spalart-Allmaras湍流模型,对高雷诺数下串列双圆柱流致振动进行数值计算。利用粗糙带改变圆柱表面结构,详细分析串列双圆柱流致振动响应及能量转换特性。结果表明双圆柱产生流致振动时,上下游圆柱的振幅和频率响应曲线出现涡致振动初始分支、涡致振动上部分支和驰振分支,圆柱驰振时的最大振幅达到了2.8D。在所研究的整个Re数范围内,双圆柱都能有效实现能量收集。在Re=100000时,圆柱流致振动能量转换最大功率达到了41.16 W。

Two-dimensional unsteady Reynolds-Averaged Navier-Stokes equations with SpalartAllmaras turbulence model are used to simulate the flow-induced motion of two circular cylinders in tandem at high Reynolds numbers.The roughness strips are applied to alter the surface structure of the circular cylinder.The flow-induced motion and energy conversion of the cylinders are analysed in detail.Three regions are clearly observed in the amplitude and frequency ratio curves,which are initial branch and upper branch in vortex-induced vibration,and galloping.The maximum amplitude of 2.8 diameters is reached in the galloping branch.Power can be harnessed by the two cylinders over the tested Reynolds number range.And the power reaches 41.16 W when Re=100,000.