基于DES方法的螺旋桨尾涡演化数值研究

采用分离涡模拟(DES)方法对多工况下螺旋桨的尾流场特性及尾涡结构进行数值研究,应用滑移网格技术完成螺旋桨敞水试验模拟,采用Spalart-Allmaras湍流模型封闭N-S方程组。数值计算结果显示:采用DES方法得到的水动力特性结果与模型试验结果吻合度高,DES方法能够较好地捕捉到螺旋桨尾流场中复杂的尾涡结构,螺旋桨不同桨叶产生的梢涡之间的自诱导和相互诱导作用引起尾涡结构形态变化,4叶桨梢涡结构之间会产生2次融合重组,毂涡振荡与梢涡演化之间存在相互干扰作用,不同进速系数下尾涡演化规律基本一致。

Detached Eddy Simulation of Wake Vortex Evolution for a Propeller

The vortex structures of propeller directly affects the performance of propeller, such as hydrodynamic performance, cavitation and noise. Detached eddy simulation (DES) numerical method is employed in the study of propeller wake characteristics and vortex structure under different conditions. The sliding grid technique is used in the propeller open water performance test, and the Spalart-Allmaras turbulence model is used in the N-S equations. The numerical results show that the results of dynamic characteristics obtained by DES method and the model test match well. DES method can capture the complex vortex structures well in the flow field of the propeller, and the vortex structure changes, which is caused by the self and mutual induction between different blade tip vortex of the propeller, two groupings will happen between the tip vortex structures for a typical 4-blade propeller, and there is mutual interference effect between hub vortex oscillation and tip vortex evolution. However, the vortex evolution regular is basically the same for all conditions.