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CLC number: V23; V43

On-line Access: 2019-06-04

Received: 2019-03-29

Revision Accepted: 2019-08-16

Crosschecked: 2019-08-22

Cited: 0

Clicked: 416

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Peng Wang

https://orcid.org/0000-0002-8833-6056

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.9 P.701-713

http://doi.org/10.1631/jzus.A1900130


Characteristics of mixing enhancement achieved using a pulsed plasma synthetic jet in a supersonic flow


Author(s):  Peng Wang, Chi-bing Shen

Affiliation(s):  Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China

Corresponding email(s):   cbshen@nudt.edu.cn

Key Words:  Supersonic shear layers, Supersonic mixing layers, Plasma synthetic jet (PSJ), Mixing enhancement


Peng Wang, Chi-bing Shen. Characteristics of mixing enhancement achieved using a pulsed plasma synthetic jet in a supersonic flow[J]. Journal of Zhejiang University Science A, 2019, 20(9): 701-713.

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journal="Journal of Zhejiang University Science A",
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doi="10.1631/jzus.A1900130"
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%T Characteristics of mixing enhancement achieved using a pulsed plasma synthetic jet in a supersonic flow
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T1 - Characteristics of mixing enhancement achieved using a pulsed plasma synthetic jet in a supersonic flow
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DOI - 10.1631/jzus.A1900130


Abstract: 
supersonic mixing layers exist extensively in supersonic engineering applications. The rapid mixing of fuel and oxidant at short distances is of great importance, but makes it difficult to develop efficient propulsion systems. The plasma synthetic jet (PSJ) is regarded as a promising high-speed flow control technique. The characteristics of mixing enhancement achieved using a pulsed PSJ were investigated via experiments. Results showed that the PSJ is an effective method for mixing enhancement. Nanoparticle-based planar laser scattering (NPLS) was used to obtain flow structures in three directions. The velocity fields near the PSJ actuator orifice were measured by particle image velocimetry (PIV). Indexes of the fractal dimension and mixing layer thickness were applied to estimate the effect of the PSJ actuator on the supersonic mixing layers. The large-scale vortex structures induced by the pulsed PSJ in the supersonic mixing layers were successfully captured by NPLS. The effect of the PSJ on the supersonic mixing layers was remarkable. The mixing layer thickness under perturbation was larger than that under no perturbation in the downstream. The distribution of the fractal dimension suggests that perturbation of the PSJ cannot improve the fractal dimension values of the fully developed supersonic mixing layers.

This work conerns an application of the plasma syhthetic jet (PSJ) to supersonic mixing layer. By NPLS technique, a primary experimental investigation has been carried out in a supersonic wind tunnel to illustrate the effectiveness of PSJ on the enhancement of mixing. So far as I know, the topic appears new and the results are interesting.

等离子体合成射流扰动在超声速流场中不同位置的截面特性以及涡结构演化

目的:燃料和氧化剂的快速掺混是发展超燃冲压发动机的关键技术. 本文使用等离子体合成射流对超声速混合层进行增强混合,采用实验的方法获得等离子体合成射流扰动后超声速混合层的精细结构,并研究在超声速混合层中等离子体合成射流增强混合的特性.
创新点:1. 使用纳米平面激光散射技术(NPLS)获取在超声速混合层中由等离子体合成射流诱导的大尺度涡结构; 2. 分析由等离子体合成射流诱导的大尺度涡结构的演化过程.
方法:1. 使用信号源发生器实现纳米平面激光散射/粒子图像测速(NPLS/PIV)和脉冲电源的时序控制,从而实现NPLS对等离子体合成射流诱导的大尺度涡结构的捕捉,以及得到PIV获取流场的速度分布; 2. 获得不同位置截面和不同延时时刻的流场精细结构,并分析等离子体合成射流增强混合的特性; 3. 对NPLS结果提取湍流边界,计算湍流的混合层的厚度和分形维数.
结论: 1. 等离子体合成射流可以对超声速混合层产生较大的扰动,展向方向扰动范围超过8D; 2. 等离子体合成射流可以增加混合层的厚度; 3. 等离子体合成射流的扰动无法进一步提高充分发展的超声速混合层的分形维数.

关键词:超声速剪切层; 超声速混合层; 等离子体合成射流; 混合增强

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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