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首页> 外文期刊>International Journal of Heat and Fluid Flow >Dynamics of the jet flow issued from a lobed Nozzle: Tomographic particle image velocimetry measurements
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Dynamics of the jet flow issued from a lobed Nozzle: Tomographic particle image velocimetry measurements

机译：从裂片喷嘴发出的喷射流动的动态：断层粒子图像速度测量

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摘要

This study focuses on the dynamics of the three-dimensional jet flow issued from a lobed nozzle. Flow field measurements were performed using a split-screen dual-camera tomographic particle image velocimetry (tomoPIV) system. The lobed nozzle was constructed using three-circle configuration at the nozzle exit, where the ratio of the circular centre offset to the circle radius was a/b = 0.8. Two high-speed cameras were used with an appropriate combination of prismatic and planar mirrors to split each camera into two views. The Reynolds number was fixed at Re = 2400, and the circular jet at the same Reynolds number was also measured for comparison. Fourier mode decomposition was used to identify the large-scale structures superposed in the unsteady flow field. The lobe trough in the jet decreased the jet's width due to the smooth connection between the pipe section and the lobed exit. Turbulence was intensified in the jet shear layer, and the passing fluid puffs in the circular jet instantaneous flow field were also broken in the lobed jet. The successively passing fluid puffs in the circular jet were observed to be the axisymmetric large-scale structure in Fourier modes dominating at St = 0.39. However, breakdown of the axisymmetric structures was induced by the lobed nozzle at St = 0.51 and 0.65, and the double helical modes arose at St = 0.28 and 0.38 (also 0.4) in the shear layer of the jet potential core and interacted with the entire jet column.
机译：本研究重点介绍从裂片喷嘴发出的三维喷射流动的动态。使用分流屏双摄像头断层粒子图像VEMIFETRY（TOMOPIV）系统进行流场测量。在喷嘴出口处使用三圆形构造构造裂片喷嘴，其中圆形中心偏移到圆半径的比率是A / B = 0.8。两个高速相机与棱镜和平面镜的适当组合使用，将每个相机分成两个视图。 Reynolds数在Re = 2400处固定，并且还测量相同雷诺数的圆形射流进行比较。傅里叶模式分解用于识别在非定常流场中叠置的大规模结构。由于管道部分和裂出的出口之间的平稳连接，喷射器中的叶片槽的宽度降低了喷射的宽度。在喷射剪切层中加剧了湍流，并且在横向射流中也破碎了圆形喷射瞬时流场中的通过流体浮粉。观察到圆形射流中的连续通过流体粉扑以在ST = 0.39处主导的傅立叶模式中的轴对称大规模结构。然而，在ST = 0.51和0.65处的裂片喷嘴诱导轴对称结构的衰弱，双螺旋模式在射流潜在核心的剪切层中在ST = 0.28和0.38（也0.4）中产生并与整个相互作用喷射栏。

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  • 来源
    《International Journal of Heat and Fluid Flow》 |2021年第6期|108795.1-108795.10|共10页
  • 作者

    He Chuangxin; Liu Yingzheng; Gan Lian;

  • 作者单位

    Shanghai Jiao Tong Univ Sch Mech Engn Key Lab Educ Minist Power Machinery & Engn Shanghai 200240 Peoples R China|China Aerodynam Res & Dev Ctr Key Lab Aerodynam Noise Control Mianyang 621000 Sichuan Peoples R China;

    Shanghai Jiao Tong Univ Sch Mech Engn Key Lab Educ Minist Power Machinery & Engn Shanghai 200240 Peoples R China;

    Univ Durham Dept Engn Durham DH1 3LE England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dynamics; Lobed jet; Tomo-PIV; Fourier mode decomposition; Helical mode;

    机译：动态;裂片喷射;Tomo-PIV;傅立叶模式分解;螺旋模式;

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