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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Experimental investigation on the outlet flow field structure and the influence of Reynolds number on the outlet flow field for a bladeless fan
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Experimental investigation on the outlet flow field structure and the influence of Reynolds number on the outlet flow field for a bladeless fan

机译：无叶风扇出口流场结构的实验研究及雷诺数对出口流场的影响

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摘要

The outlet flow field of an annular jet for a bladeless fan was investigated experimentally using CTA (Constant Temperature Anemometer) hot-wire system in detail, at five Reynolds numbers ranging from 28,200 to 40,100. From the experiment results, it can be concluded that: (1) the time-averaged velocity in both the horizontal and vertical radial directions, and the time-averaged velocity and turbulence intensity on the axis, all increase with increasing Reynolds number; (2) some variation situations of Sk (skewness) and Ku (kurtosis) of PDF (Probability Density Function) for dimensionless fluctuating velocity on the axis inversely dependent on Reynolds number, indicating that the decrease of Reynolds number intensifies the motion of large-scale coherent structures; (3) the annular jet within the outlet flow field starts to converge about at the cross-section of 1.5d (d represents the throat diameter of the Coanda surface) at each Reynolds number; the lower part of the flow field is combined upwards into the upper part; this combination has been finished about at cross-section of 3d; (4) the combined jet is similar to a classical single jet, the peak decay slope increasing with increasing Reynolds number; also, the intrinsic flow mechanism of this flow field structure has been revealed. (C) 2016 Elsevier Ltd. All rights reserved.
机译：使用CTA（恒定温度风速计）热线系统对无叶风扇的环形喷嘴的出口流场进行了实验研究，其雷诺数为5，范围为28,200至40,100。从实验结果可以得出以下结论：（1）在水平和垂直径向上的时间平均速度以及在轴上的时间平均速度和湍流强度都随雷诺数的增加而增加; （2）PDF（概率密度函数）的Sk（偏度）和Ku（峰度）的一些变化情况，轴上无量纲的脉动速度与雷诺数成反比，表明雷诺数的减少会加剧大尺度运动连贯的结构; （3）在每个雷诺数处，出口流场内的环形射流在1.5d的横截面处开始收敛（d表示柯恩达表面的喉部直径）;流场的下部向上组合成上部。该组合已在3d横截面处完成; （4）组合射流类似于经典的单射流，其峰值衰减斜率随雷诺数的增加而增加;同时，还揭示了这种流场结构的内在流动机理。 （C）2016 Elsevier Ltd.保留所有权利。

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