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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Flow characterization of an array of finite-span synthetic jets in quiescent ambient
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Flow characterization of an array of finite-span synthetic jets in quiescent ambient

机译：静态环境中有限跨度合成喷射阵列的流量表征

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摘要

An experimental study on the flow characteristics of an array of finite-span Synthetic Jets (SJs) issuing at different conditions in a quiescent ambient was carried out by means of hot-wire and phase-locked planar Particle Image Velocimetry measurements. The actuator comprises twelve slots with aspect ratio 15 fed by a common resonant cavity and off-centered from the axis of the cavity. The frequency response indicates that the SJs are formed in the range of Stokes numbers between 4 and 12.5, in which two operating conditions were inspected yielding the SJs issuing either at Reynolds (Re) and Strouhal (St) numbers of Re = 40 and St = 0.84 or Re = 213 and St = 0.50. It is found that, for the case at Re = 40 and St = 0.84, the flow field undergoes the asymmetries of the actuator. The axis switching persists in the very-near field of the SJ array, while further downstream the spreading of each SJ becomes more pronounced promoting the jet interaction. For the case at Re = 213 and St = 0.50, the main flow direction along the cross-sectional plane tilts of 14.8 degrees towards the side where the cavity extends. The formation of a recirculation region promotes the enhancement of turbulent dissipation mechanisms. The phase-average flow fields reveal that, similarly for both cases, the imprint of the vortical structures exhibits symmetric organization during the ejection phase.
机译：通过热线和锁相平面粒子图像速度测量来执行对静态环境中的不同条件下发出的有限跨度合成射流（SJ）的流动特性的实验研究。致动器包括具有纵横比15的12个槽，纵横比15通过公共谐振腔供给，并从腔的轴线偏心。频率响应表明SJ在4到12.5之间的Stokes数字范围内形成，其中检查了两个操作条件，从reynolds（re）和strouhal（st）的Re = 40和st = st = st = 0.84或RE = 213和ST = 0.50。结果发现，对于Re = 40和ST = 0.84的情况，流场经历致动器的不对称。轴切换持续在SJ阵列的非常近的字段中，而进一步下游每个SJ的扩展变得更加明显促进喷射交互。对于RE = 213和ST = 0.50的情况，沿着横截面倾斜的主流量方向朝向腔延伸的侧面倾斜14.8度。再循环区域的形成促进了湍流耗散机制的增强。相平面的流场揭示了，类似于两种情况，涡流结构的压印在喷射阶段期间呈现对称组织。

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