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.
概要
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。
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Peng WANG wrote the first draft of the manuscript. Chi-bing SHEN guided the design and test research work of the paper, moreover, revised and edited the final version.
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Peng WANG and Chi-bing SHEN declare that they have no conflict of interest.
Project supported by the National Natural Science Foundation of China (No. 11572346)
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Wang, P., Shen, Cb. Characteristics of mixing enhancement achieved using a pulsed plasma synthetic jet in a supersonic flow. J. Zhejiang Univ. Sci. A 20, 701–713 (2019). https://doi.org/10.1631/jzus.A1900130
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DOI: https://doi.org/10.1631/jzus.A1900130