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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Synthetic Jet Interactions with Flows of Varying Separation Severity and Spanwise Flow Magnitude
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Synthetic Jet Interactions with Flows of Varying Separation Severity and Spanwise Flow Magnitude

机译：APS-流体动力学APS分部第70届年会-事件-分离强度和跨度流量随流量变化的合成射流相互作用

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摘要

Flow physics associated with the interactions of synthetic jet actuators with a highly three-dimensional separated flow over a flapped airfoil were investigated experimentally and analyzed using stereo particle image velocimetry (SPIV) and surface pressure data. Increased understanding of active flow control devices in flows which are representative of airplane wings or tails can lead to actuator placement (i.e., chordwise location, spanwise spacing) with the greatest beneficial effect on performance. An array of discrete synthetic jets was located just upstream of the control surface hingeline and operated at a blowing ratio of 1 and non-dimensional frequency of 48. Detailed flowfield measurements over the control surface were conducted, where the airfoil's sweep angle and the control surface deflection angle were fixed at 20extdegree . Focus was placed on the local and global flowfields as spanwise actuator spacing was varied. Moreover, surface pressure measurement for several sweep angles, control surface deflection angles, and angles of attack were also performed. Actuation quad resulted in an overall separation reduction and a dependence of local flowfield details (i.e. separation severity, spanwise flow magnitude, flow structures, and jet trajectory) on spanwise jet spacing.
机译：实验研究了与合成射流致动器与拍打翼型上的高三维分离流之间的相互作用有关的流物理学，并使用立体粒子图像测速（SPIV）和表面压力数据进行了分析。对代表飞机机翼或机尾的流动中的主动流动控制装置的更多了解可导致执行器放置（即弦向位置，翼展方向间距），从而对性能产生最大的有益影响。一系列离散的合成射流位于控制面铰链线的上游，并以1的吹气比和48的无量纲频率运行。在控制面进行了详细的流场测量，其中机翼的后掠角和控制面偏转角固定在20extdegree。随着翼展方向致动器间距的变化，重点放在局部和全局流场上。此外，还进行了多个扫角，控制表面偏转角和迎角的表面压力测量。四极驱动导致总体分离减小，并且局部流场细节（即分离严重程度，翼展方向的流量大小，流结构和喷射轨迹）与翼展方向的喷射间距有关。

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