Parallel Interaction of Incident Vortex Array with Oscillating Airfoil
Parallel Interaction of Incident Vortex Array with Oscillating Airfoil
复制标题
入射涡阵列与振荡翼型的并行相互作用
DOI：
10.2514/2.2364
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. K. Hsieh
中科院分区：
文献类型：
--
作者：
C. Kuo;J. K. Hsieh
基于涡量平衡的概念，对入射涡阵与NACA0012翼型的正弦振荡平行干扰进行了实验研究。结果表明，局部环流的时空变化可以清楚地揭示翼型上高度畸变涡量场的对流。近表面流动结构的相平均锥表明，表面涡量产生的时空变化与前缘分离涡沿着翼型的形成和随后的运动密切相关。在振荡周期的上升冲程部分，翼型前缘产生了大量的表面涡量。局部环流相对于表面涡量生成的相位信息清楚地表明，前缘分离涡是在顺时针旋转的入射涡通过后立即诱导的。与均匀流中的振荡翼型相比，入射涡阵对振荡翼型的冲击增加了振荡周期内翼型周围的平均总环量。
Parallel interaction of an incident vortex array with a NACA 0012 airfoil in the form of sinusoidal oscillation was investigated experimentally, based on the concept of vorticity balance. It was found that the temporal ‐spatial variations of the local circulation can clearly reveal the convection of the highly distorted vorticity e eld over the airfoil. The phase-averaged near-surface e ow structure cone rmed that the temporal ‐spatial variations of the surface vorticity generation are closely related to the formation and subsequent motion of the leading-edge separation vortex along the airfoil. During the upstroke portion of the oscillation cycle, signie cant amounts of the surface vorticity were generated from the leading edge of the airfoil. The phase information of the local circulation relative to that of the surface vorticity generation clearly indicated that the leading-edge separation vortex was induced immediately after the passage of the clockwise-rotating incident vortex. When compared with the oscillating airfoil in uniform e ow, the impingement of the incident vortex array on the oscillating airfoil increased the mean overall circulation around the airfoil over the oscillation cycle.