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雷诺数对圆形渐缩喷嘴湍流射流的影响 总被引:2,自引:0,他引:2
The present study systematically investigates by experiment the influence of Reynolds number (Re) on a turbulent jet issuing from a smoothly-contracting round nozzle. Measurements were performed for seven Reynolds numbers varying from Re = 4,050 to Re = 20,100 using single hot-wire anemometry and over an axial distance of 30 nozzle exit diameters. Although all the exit velocity profiles are of "top-hat" shape, these measurements reveal significant dependence on Re of the exit and downstream flows. The effect of Re on both the mean and turbulent fields is substantial for Re < 10,000 and becomes weak beyond Re = 10,000. The length of the jet’s potential core and the far-field rates of decay and spread all depend significantly on Re. 相似文献
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大气边界层剪切湍流统计特性的风洞实验及其层次相似律 总被引:1,自引:1,他引:0
对风洞模拟的大气边界层的剪切湍流场的速度脉动时间序列信号以及某一高度位置上的小波变换分解重构的信号进行了系统的统计分析.结果表明, 在非均匀下垫面大气边界层的不同垂直高度上的信号, She-Leveque湍流层次相似律都成立, 层次相似指数β和最高激发态的奇异标度指数γ随垂直高度的变化而变化, 并给出不同尺度的分解重构信号的一些层次结构特点. 相似文献
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尝试近年来发展的湍流层次结构模型应用于分析气温序列涨落,试图寻求一种研究气温变化中多尺度现场的新方法。通过分析北半球近百年月平均气温距平的Jones序列,证实了层次相似律的存在,得到层次相似系数β,并对其物理含义进行了讨论。 相似文献