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首页> 外文期刊>The Aeronautical Journal >Experimental and numerical study of mixing characteristics of a rectangular lobed mixer in supersonic flow
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Experimental and numerical study of mixing characteristics of a rectangular lobed mixer in supersonic flow

机译：矩形叶片混合器在超音速流动中混合特性的实验与数值研究

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摘要

A combined experimental and computational study on a rectangular lobed mixer is performed. A series of simulations based on a steady Reynolds-averaged Navier-Stokes Simulation (RANS) are conducted to analyse the mixing mechanisms of large-scale streamwise structure shed by the trailing edge of lobed mixer, with emphasis being placed on the effect of turbulence modeling and inflow conditions. The simulations are validated in respect of velocity and scalar distribution against the data obtained through Particle Image Velocimetry (PIV) and Nanoparticle-based Planar Laser Scattering (NPLS) technique. The computational results predicted by the SST k-omega turbulence model show better agreement with the experimental data. But the small-scale turbulence structures are not captured accurately by these turbulence models. The convoluted shear layer shed from trailing edge is stretched and rotated by the large-scale streamwise vortices, forming an unstable 'pinching-off' structure, which increases the interfacial area. And at the interface of two streams, a large number of small-scale turbulence structures are formed, which contribute a lot to the mixing enhancement along with the increased interfacial area. The streamwise voracity decays more rapidly with the decrease of velocity ratio and total pressure ratio of two streams. The scalar thickness which reflects the mixing rate of two streams increases with the decreasing velocity ratio and total pressure ratio.
机译：在矩形波瓣混合器上进行了组合的实验和计算研究。进行了一系列基于稳态雷诺平均Navier-Stokes模拟（RANS）的模拟，以分析叶片混合器后缘流下的大规模流式结构的混合机理，重点放在湍流建模的效果上和流入条件。针对通过粒子图像测速（PIV）和基于纳米粒子的平面激光散射（NPLS）技术获得的数据，针对速度和标量分布进行了仿真验证。 SSTk-ω湍流模型预测的计算结果与实验数据更好地吻合。但是这些湍流模型不能准确地捕获小尺度湍流结构。从后缘脱落的回旋剪切层被大规模的流向涡旋拉伸并旋转，形成了不稳定的“夹断”结构，从而增加了界面面积。并且在两个流的界面处，形成了大量的小规模湍流结构，这对增加混合以及增加界面面积做出了很大贡献。随着两条流的速度比和总压力比的减小，沿河的孔隙度衰减得更快。反映两个流的混合速率的标量厚度随着速度比和总压力比的减小而增加。

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  • 来源
    《The Aeronautical Journal》 |2015年第1216期|701-725|共25页
  • 作者

    Feng J. -H.; Shen C. -B.; Wang Q. -C.; Lei J.;

  • 作者单位

    Natl Univ Def Technol, Coll Aerosp Sci & Engn, Sci & Technol Scramjet Lab, Changsha, Hunan, Peoples R China;

    Natl Univ Def Technol, Coll Aerosp Sci & Engn, Sci & Technol Scramjet Lab, Changsha, Hunan, Peoples R China;

    Natl Univ Def Technol, Coll Aerosp Sci & Engn, Sci & Technol Scramjet Lab, Changsha, Hunan, Peoples R China;

    Natl Univ Def Technol, Coll Aerosp Sci & Engn, Sci & Technol Scramjet Lab, Changsha, Hunan, Peoples R China;

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