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雷诺数对湍流特性的影响 被引量:4

THE EFFECTS OF REYNOLDS NUMBER ON TURBULENCE
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摘要 主要对近年来关于雷诺数(Re)对湍流特性的影响的研究进行了回顾.研究表明除径向偏斜系数和平坦系数分布外,确实存在一个不受Re数影响的区域,但对于不同的物理量这一区域的范围是不同的,即使是同一物理量不同研究者的结果亦不尽相同,显示了近壁区流动的复杂性和测量的困难,激光测速技术(LDV)由于其具有测量精度高、不干扰流场、空间分辨率细等优点,近年来广泛地应用于对湍流,特别是对湍流近壁区流动特性及Re数对湍流统计特性影响等的精细测量,随着LDV自身及其它相关测试技术的进一步改进,LDV在了解湍流产生机理、能量转换等方面发挥着越来越重要的作用. The recent development of studies on Reynolds number (Re) on turbulence is reviewed.It is found that, except for the distributions of radial skewness and flatness factors, there exists aRe-dependence region. For different physical paraxneters, this region is different, and different resultsare obtained even for a same physical parameter. This means that the flow is complex in the nearwall region and it is difficult to measure precisely. Owing to the high precision, no disturbance tothe flow, fine spatial resolution etc., the Laser Doppler Velocimetery (LDV) has been widely usedto measure turbulent flow, especially to measure the characteristics of turbulence in the near wallregion and the Re-dependence on the statistic characteristics of turbulence. With the improvementof LDV and the relevant measurement technology, LDV will play a more and more important rolein ullderstanding the mechalnism of turbulence production, energy transportation etc.
出处 《力学与实践》 CSCD 北大核心 1999年第6期1-7,共7页 Mechanics in Engineering
关键词 湍流 雷诺数 LDV测量 热线测量 turbulence, Re-dependence, LDV measurement, hot-wire measurement
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参考文献2

  • 1Qian J,Phs Rev B,1997年,55卷,337页
  • 2Ching C Y,Exp Fluids,1995年,19卷,61页

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