Further Examination of the Mechanism of Round Synthetic Jets in Delaying Turbulent Flow Separation

Further Examination of the Mechanism of Round Synthetic Jets in Delaying Turbulent Flow Separation
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圆形合成射流延迟湍流分离机理的进一步研究

DOI:
10.1007/s10494-013-9469-5
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发表时间:
2013
期刊:
Flow, Turbulence and Combustion
影响因子:
--
通讯作者:
Zhong S
Zhong S
中科院分区:
--
文献类型:
--
作者:
Zhong S

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本文报道了作者对二维斜坡上分离湍流边界层与圆形合成射流相互作用区的二维和体视PIV数据的进一步研究结果。合成射流在两个致动频率下操作,其中一个致动频率接近分离剪切层的固有频率。采用三重分解技术和Q准则研究了在不同的合成射流工作条件下,分离流对合成射流在一个激励周期中产生的涡结构的不同部分的通过的响应。试图解释所观察到的差异的方式,分离流响应于在两个驱动频率的合成射流的驱动。更好地理解流动分离延迟使用圆形合成射流的机制,导致一个更完整的物理模型描述的相互作用机制。
This paper reports the findings from a further study of the 2D and stereo PIV data obtained in the interaction zone between the separated turbulent boundary layer over a 2D ramp and round synthetic jets by the authors. The synthetic jets are operated at two actuation frequencies with one being close to the natural frequency of the separated shear layer. Both the triple decomposition technique and Q-criterion are employed to investigate how the separated flow responds to the passage of different parts of the vortical structures produced by the synthetic jets during an actuation cycle at different synthetic jet operating conditions. An attempt is made to explain the observed differences in the ways that the separated flow responds to the actuation of synthetic jets at the two actuation frequencies. A better understanding of the mechanism of flow separation delay using round synthetic jets is obtained, leading to a more complete physical model describing the interaction mechanism.
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