翼/板结合部涡旋流动结构与壁面脉动压力的大涡模拟研究

Large eddy simulation of vortical flow structure and wall pressure fluctuations around wing-plate junction

壁面脉动压力是湍流非定常特性的重要表征,而且是重要的流体动力声源,所以对于脉动压力的研究已经成为流声耦合研究领域的重要课题。文章采用大涡模拟方法结合动态Smagorinsky亚格子涡模型,数值计算了两型翼/板结合部在不同流速下的湍流脉动压力,并展示了结合部马蹄涡流动结构。通过将计算结果与试验结果进行对比分析可知,数值计算方法能准确地预报湍流脉动压力,从而为理解翼/板结合部非定常流动的物理机理奠定了基础。

Wall Pressure Fluctuations （WPF） represent the unsteady feature of turbulence. It is a significant hydrodynamic acoustic source. The study of WPF has become vigorous in the field of flow-acoustic cou- pling. The wall pressure fluctuations of wing/plate junctions （two shapes） under different velocities are sim- ulated numerically by large eddy simulation with dynamic Smagorinsky subgrid model. And the horse-shoe vortical field around wing/plate junction is captured and displayed. It shows that the computed wall pres- sure fluctuations agree well with experimental measurements. And the numerical computation approach for WPF is validated. These works are beneficial for understanding the physical mechanism of unsteady flow around wing/plate junction.