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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science >An experimental study on the behaviours of circular synthetic jets at low Reynolds numbers
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An experimental study on the behaviours of circular synthetic jets at low Reynolds numbers

机译：低雷诺数下圆形合成射流特性的实验研究

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摘要

In the work presented in this article, the behaviour of circular synthetic jets issuing into quiescent surrounding fluid at low Reynolds numbers is experimentally studied for potential mixing applications of synthetic jets at micro-scales or in highly viscous fluids. Sugar solutions and silicone oil are used as the flow media in order to achieve the required low Reynolds numbers. The conditions for jet instability, vortex rollup and synthetic jet formation are investigated using both flow visualisation techniques and particle image velocimetry, and the typical behaviour of synthetic jets at a Reynolds number around unity is also illustrated. The roles of Reynolds number, dimensionless stroke length and Stokes number in determining the characteristics of synthetic jets are examined and found to be largely consistent with the finding obtained at higher Reynolds numbers. Finally, a parameter map of synthetic jet flow patterns is produced based on the results from this study, which can be used to aid the choice of synthetic jet operating conditions for specific applications or anticipate if a desired vortex structure can be obtained at a given synthetic jet operating condition.
机译：在本文提出的工作中，对低雷诺数下的静态循环流体中发出的圆形合成射流的行为进行了实验研究，以研究合成射流在微型或高粘度流体中的潜在混合应用。糖溶液和硅油用作流动介质，以实现所需的低雷诺数。使用流动可视化技术和粒子图像测速技术研究了射流不稳定，涡旋累积和合成射流形成的条件，并且还说明了合成射流在雷诺数为1附近的典型行为。研究了雷诺数，无量纲行程长度和斯托克斯数在确定合成射流特性中的作用，发现它们与较高雷诺数时的发现基本一致。最后，根据这项研究的结果生成了合成射流流型的参数图，可用于辅助选择特定应用的合成射流操作条件，或预测是否可以在给定合成条件下获得所需的涡旋结构喷气机的工作条件。

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