A Jet Formation Criterion for Synthetic Jet Actuators
A Jet Formation Criterion for Synthetic Jet Actuators
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DOI：
10.2514/6.2003-636
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发表时间：
2003-01
期刊：
影响因子：
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通讯作者：
Y. Utturkar;R. Holman;R. Mittal;B. Carroll;M. Sheplak;L. Cattafesta
中科院分区：
文献类型：
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作者：
Y. Utturkar;R. Holman;R. Mittal;B. Carroll;M. Sheplak;L. Cattafesta
提出并验证了合成射流激励器的射流形成判据。合成射流是一种零净质量通量装置，向周围环境增加额外动量但不增加质量。射流形成被定义为沿射流轴线沿着向外的平均速度，并对应于脱落涡流的清晰形成。结果表明，合成射流的形成受Strouhal数（或Reynolds数和Stokes数）的控制。数值模拟和实验进行补充现有的二维和轴对称射流形成的文献数据。数据支持射流形成准则，其中常数2 Re/ S K > K对于二维和轴对称合成射流分别约为2和0.16。该标准对于厚度与宽度比大于约2的相对厚的孔板是有效的。这一结果对流控作动器和发动机短舱声衬的设计具有一定的参考价值。
This paper proposes and validates a jet formation criterion for synthetic jet actuators. The synthetic jet is a zero net mass flux device, adding additional momentum but no mass to its surroundings. Jet formation is defined as a mean outward velocity along the jet axis and corresponds to the clear formation of shed vortices. It is shown that the synthetic jet formation is governed by the Strouhal number (or Reynolds number and Stokes number). Numerical simulations and experiments are performed to supplement available two-dimensional and axisymmetric jet formation data in the literature. The data support the jet formation criterion , where the constant 2 Re/ S K > K is approximately 2 and 0.16 for two dimensional and axisymmetric synthetic jets, respectively. This criterion is valid for relatively thick orifice plates with thickness-to-width ratios greater than approximately 2. This result is expected to be useful for the design of flow-control actuators and engine nacelle acoustic liners.