Comparison of Rotating and Translating Wings: Force Production and Vortex Characteristics
Comparison of Rotating and Translating Wings: Force Production and Vortex Characteristics
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DOI：
10.2514/1.j054422
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发表时间：
2016-02-01
期刊：
影响因子：
2.5
通讯作者：
Jones, Anya R.
中科院分区：
文献类型：
--
作者：
Manar, Field;Mancini, Peter;Jones, Anya R.
在高攻角矩形平板机翼上进行了实验，比较了直线和旋转俯仰、喘振、快加速度和慢加速度八组机翼运动学的力产生、前缘涡位置和强度与时间的关系。在力历史中观察到的主要差异是在俯仰和喘振情况下，它们发生在运动的加速或俯仰部分。发现在直线和旋转情况下的力历史是相似的。在新的时间尺度sigma/c上，与前缘-法向综合速度有关，直线情况下的前缘涡轨迹是相似的。旋转情况下的涡轨迹与直线情况下的涡轨迹一致，直到旋转情况下的前缘涡沉降到附着在机翼上的位置。所有情况下的前缘涡环流值与s/c的比值和前缘法向速度的瞬时比例尺都出现了塌陷。结果表明，仅使用前沿运动学就可以成功地减少涡量和力的产生。
Experiments were conducted on a rectangular flat plate wing at high incidence to compare the force production and leading-edge vortex location and strength as a function of time for eight sets of wing kinematics: rectilinear and rotational pitch and surge, with fast and slow accelerations. The primary differences observed in the force histories were between the pitch and surge cases, and they occurred during the acceleration or pitching portions of the motions. The force histories were found to be similar between the rectilinear and rotational cases. The leading-edge vortex trajectories in the rectilinear cases were found to be similar when compared on a new time scale sigma/c, related to the integrated leading-edge-normal velocity. The vortex trajectory of the rotational cases matched those of the rectilinear cases until the leading-edge vortex in the rotational case settled into a position attached to the wing. Circulation values of the leading-edge vortex for all cases were found to collapse when plotted versus s/c and scaled by the instantaneous leading-edge-normal velocity. The results demonstrate a successful collapse of both vortex quantities and force production using only leading-edge kinematics.