Clockwise Vortical-Gust/Airfoil Interactions at a Transitional Reynolds Number
Clockwise Vortical-Gust/Airfoil Interactions at a Transitional Reynolds Number
复制标题
过渡雷诺数下的顺时针涡旋阵风/机翼相互作用
作者：
C. Barnes;M. Visbal
本文提出了平行涡旋阵风与 NACA0012 机翼相互作用的高保真隐式大涡模拟 (ILES)，该机翼在基于过渡弦的雷诺数 Rec=200,000 和攻角 α=4 deg 下运行。阵风作为泰勒涡流在翼型上游提供。对于顺时针 (CW) 方向的阵风，考虑三个不同的初始垂直位置。将 CW 阵风相互作用的 ILES 模拟与无粘性模拟以及先前的逆时针 (CCW) 阵风模拟进行了比较。与之前的 CCW 阵风相互作用相反，上表面边界层经历了层流分离、过渡和在阵风后面徘徊的湍流重新附着的上游偏移。这种向上游的转变表现为缓慢松弛至预状态的上仰力矩系数。与之前的 CCW 情况一样，下表面边界层被 CW 涡流破坏，产生短暂的声学事件。当...时，这种影响尤其严重。
This paper presents high-fidelity implicit large-eddy simulations (ILES) of parallel vortical gust interactions with a NACA0012 airfoil operating at a transitional chord-based Reynolds number of Rec=200,000 and an angle of attack of α=4 deg. The gust is supplied upstream of the airfoil as a Taylor vortex. Three different initial vertical positions are considered for a clockwise (CW)-oriented gust. ILES simulation of CW gust interactions is compared with inviscid simulations as well as prior counterclockwise (CCW) gust simulations. Contrary to the previous CCW gust interactions, the upper surface boundary-layer experiences an upstream excursion of laminar separation, transition, and turbulent reattachment that lingers behind the gust. This upstream shift manifests in a pitch-up moment coefficient that relaxes slowly to the pregust state. As in the previous CCW cases, the lower surface boundary layer is disrupted by the CW vortex producing a brief acoustic event. This effect is particularly severe when the...