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首页> 外文期刊>Journal of Fluid Science and Technology >Effects of stroke and Reynolds number on characteristics of circular synthetic jets
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Effects of stroke and Reynolds number on characteristics of circular synthetic jets

机译：冲程和雷诺数对圆形合成射流特性的影响

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摘要

The circular jet flows generated by a piezoelectric disk were studied experimentally. The velocity distributions were measured using a single hot-wire anemometer, and the effects of the oscillatory flow conditions though a circular orifice were examined. The effects of the dimensionless stroke and Reynolds number of the oscillatory flow on the synthetic jet flows were examined. The stroke was the length of the fluid ejected in an oscillatory cycle and non-dimensionalised by the orifice diameter. The mean velocity distributions were examined for a dimensionless stroke range of 0.60-2.40 with a constant Reynolds number (Re ) of 2700. The stroke was found to have a remarkable effect on the streamwise variation in the jet centerline velocity and jet width. As the stroke was increased, the starting point of the jet growth was shifted downstream. This change is discussed by examining the instantaneous velocity signals and attributes in relation to the change in the collapse of vortex rings emitted from the orifice. The momentum of the synthetic jet increased sharply above a critical stroke for the jet formation, and seemed to be saturated for strokes longer than the orifice diameter. The flow field was also examined for a Re range of 1900-3000 with a constant dimensionless stroke of 1.02. In the Re range studied, no significant changes in the jet flows were observed.
机译：实验研究了压电盘产生的圆形射流。使用单个热线风速仪测量速度分布，并检查通过圆形孔口的振荡流动条件的影响。检查了无因次冲程和振荡流的雷诺数对合成射流的影响。行程是在振荡周期中喷射的流体的长度，并且未通过孔口的尺寸确定尺寸。在0.60-2.40的无量纲行程范围内检查了平均速度分布，雷诺数（iRe）恒定，为2700。发现该行程对射流中心线速度和射流宽度的沿流变化有显着影响。随着冲程的增加，射流增长的起点向下游移动。通过检查瞬时速度信号和与从孔口发出的涡流环塌陷的变化有关的属性来讨论这种变化。合成射流的动量在形成射流的临界冲程以上急剧增加，并且对于长于孔口直径的冲程似乎已饱和。还检查了流场的Re范围为1900-3000，恒定无因次行程为1.02。在研究的Re范围内，没有观察到喷射流的显着变化。

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