北京航空航天大学学报 ›› 2021, Vol. 47 ›› Issue (5): 994-1003.doi: 10.13700/j.bh.1001-5965.2020.0105

• 论文 • 上一篇    下一篇

脉冲射流强化喷流混合流动显示实验

孔博, 王昌盛, 丁文豪, 额日其太   

  1. 北京航空航天大学 能源与动力工程学院, 北京 100083
  • 收稿日期:2020-03-22 发布日期:2021-05-28
  • 通讯作者: 额日其太 E-mail:eriqitai@buaa.edu.cn
  • 作者简介:孔博,男,博士。主要研究方向:流动控制、飞行器红外隐身;额日其太,男,博士,副研究员,博士生导师。主要研究方向:飞机进排气系统设计、红外隐身。
  • 基金资助:
    国家自然科学基金(11572027)

Flow visualization experiment of jet mixing enhancement using pulsed jets

KONG Bo, WANG Changsheng, DING Wenhao, ERIQITAI   

  1. School of Energy and Power Engineering, Beihang University, Beijing 100083, China
  • Received:2020-03-22 Published:2021-05-28

摘要: 采用激光诱导荧光的流动显示方法研究了在一对反对称模式工作的脉冲射流激励下,雷诺数约为33 000的圆形湍流射流的流场。捕捉了剪切层中大尺度展向涡结构的演化发展过程,研究了激励频率和振幅对涡结构以及强化混合效果的影响。结果表明:受激励后的主喷流剪切层中产生了交错的展向涡结构,引起了喷流的振荡,增强了卷吸能力。激励频率主要影响相邻涡环间的距离。存在最佳激励频率使喷流在受激励平面远场分叉、剪切层扩展最宽。激励振幅对涡结构也存在较大影响,振幅较大时产生的涡结构尺度更大、相干性更强、强化混合效果更好。

关键词: 流动控制, 流动显示, 强化混合, 脉冲射流, 涡环结构

Abstract: In this paper, a turbulent jet with Reynolds number 33 000 forced by a pair of pulsed jets working in antisymmetric mode is investigated using laser-induced fluorescence technique. The evolution of large-scale vortex structures in the shear layer is captured and the effect of forcing frequency and amplitude of pulsed jets on vortex structure and mixing enhancement is studied. It is found that inclined and staggered vortex structures are generated in the shear layer, causing the oscillation of primary jet and promoting entrainment. The forcing frequency mainly influences the distance of neighboring vortex rings. There exists optimal excitation frequency that causes the primary jet bifurcating in the far field and spreading most in the shear layer in the forced plane. The forcing amplitude also has effect on the vortex structure. The vortex structures are larger and more coherent at high amplitude, resulting in better mixing enhancement.

Key words: flow control, flow visualization, mixing enhancement, pulsed jet, vortex ring structure

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