Leading-edge flow sensing for detection of vortex shedding from airfoils in unsteady flows
Leading-edge flow sensing for detection of vortex shedding from airfoils in unsteady flows
复制标题
前沿流量传感，用于检测非定常流中翼型的涡旋脱落
DOI：
10.1063/5.0060600
复制
发表时间：
2021
影响因子：
4.6
通讯作者：
Ashok Gopalarathnam
中科院分区：
文献类型：
--
作者：
Aditya Saini;S. Narsipur;Ashok Gopalarathnam
感测非定常翼型流中的旋涡脱落可以有益于控制和积极利用它们的影响以提高气动性能。前缘吸力参数（LESP）是前缘吸力的无量纲度量，其随时间的变化可用于推导与非定常翼型旋涡脱落相关的各种事件。最近发展起来的前缘流传感技术（LEFS）利用翼型前缘区域的少量压力来推断翼型的气动力状态，适用于推断不可压缩流中非定常运动时的LESP变化。为此，翼型上的流动被分为弦上的外部区域流动（使用薄翼型理论建模）和前缘上的内部区域流动（建模为抛物线流动）。通过匹配这两种流动，导出了由前缘的几个压力计算LESP的关系式。通过研究LEFS输出的变化和计算的LESP为各种非定常运动，指南检测事件相关的旋涡脱落：启动，夹断，和终止。附加非定常运动的计算和实验结果证实了LEFS作为非定常翼型上旋涡脱落相关事件的传感技术的有效性。
Sensing of vortex shedding in unsteady airfoil flows can be beneficial in controlling and positively harnessing their effects for increased aerodynamic performance. The time variation of the leading-edge suction parameter (LESP), which is a non-dimensional measure of the leading-edge suction force, is shown to be useful in deducing the various events related to vortex shedding from unsteady airfoils. The recently developed leading-edge flow sensing (LEFS) technique, which uses a few pressures in the airfoil leading-edge region for deducing the aerodynamic state of an airfoil, is adapted to deduce the variation of LESP during an unsteady motion in incompressible flow. For this purpose, the flow over the airfoil is divided into an outer-region flow over the chord, modeled using thin airfoil theory, and an inner-region flow over the leading edge, modeled as a flow past a parabola. By matching these two flows, relations are derived for calculating the LESP from a few pressures at the leading edge. By studying the variations of the LEFS outputs and the calculated LESP for various unsteady motions, guidelines are presented for detecting events related to vortex shedding: initiation, pinch-off, and termination. Computational and experimental results for additional unsteady motions confirm the effectiveness of the LEFS as a sensing technique for events associated with vortex shedding on unsteady airfoils.
薄翼型非定常流中的前缘吸力和驻点位置
影响因子：
3.7
作者：
Ramesh K
通讯作者：
Ramesh K