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Mixing and entrainment in the near field of turbulent round jets

机译：湍流圆形射流近场的混合与夹带

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摘要

Results from experiments on the near field of a turbulent circular pipe jet at Reynolds numbers between 3,000 and 30,000 are compared to analytical models derived from assuming a perfect balance between axial and radial flow rates. This assumption is proved to be valid on average by taking measurements on both longitudinal and transverse planes and by direct evaluation of axial and radial flow rates. The experimental campaign is carried out by performing measurements by means of high-speed particle image velocimetry. The analytical models describe approximately the behavior of measured average radial velocities and entrainment rates with indications of a significant Reynolds number dependence which disappears for values larger than 10,000. This behavior is also confirmed by velocity rms and integral scale results.
机译：雷诺数在3,000和30,000之间的湍流圆形管道射流近场的实验结果与假设轴向和径向流速之间达到完美平衡的分析模型进行了比较。通过在纵向和横向平面上进行测量并直接评估轴向和径向流速，可以证明该假设平均有效。通过使用高速粒子图像测速仪进行测量来进行实验。分析模型大致描述了测得的平均径向速度和夹带率的行为，并显示出明显的雷诺数依赖性，对于大于10,000的值则消失。速度均方根和积分标度结果也证实了这一行为。

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  • 来源
    《Experiments in Fluids》 |2012年第1期|p.1-14|共14页
  • 作者

    Alessandro Capone; Alfredo Soldati; Giovanni Paolo Romano;

  • 作者单位

    Centro Interdipartimentale di Fluidodinamica e Idraulica, Università degli Studi di Udine, 33100, Udine, Italy;

    Centro Interdipartimentale di Fluidodinamica e Idraulica, Università degli Studi di Udine, 33100, Udine, Italy;

    Department of Mechanics and Aeronautics, Università degli Studi di Roma La Sapienza, 00184, Rome, Italy;

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