高超临界雷诺数区间内二维圆柱绕流的实测研究

发布时间：2017-12-31 06:14

本文关键词：高超临界雷诺数区间内二维圆柱绕流的实测研究　出处：《物理学报》2016年21期 　论文类型：期刊论文

【摘要】：实测强风工况下高度167 m的徐州彭城电厂冷却塔的表面风荷载,并归纳历史上其他研究人员给出的实测结果,以丰富高超临界雷诺数(Re)区间二维圆柱绕流的试验成果.在低湍流度均匀流场和高湍流度大气边界层流场中分别开展4种风速8类粗糙度条件下的冷却塔刚性模型测压风洞试验,通过对比低雷诺数(Re=2.1×10~5—4.19×10~5)条件下的风洞试验结果和高雷诺数(Re=5.4×10~7—1×10~8)条件下的现场实测结果研究各种静动态绕流特征随雷诺数的变化规律,重点考察雷诺数无关现象的产生条件.研究结果表明,对于物表相对粗糙度在0.01以上的圆柱绕流,雷诺数不相关现象存在于很宽的雷诺数范围(2×10~5Re1×10~8)内;增大来流湍流度亦能引起的雷诺数无关现象,但此时该现象可能仅存在于一个较窄的低雷诺数范围内.
[Abstract]:The surface wind loads of the cooling tower of Xuzhou Pengcheng Power Plant with a height of 167 m under strong wind conditions are measured and the measured results given by other researchers in history are summarized. Enrichment of high supercritical Reynolds number Reo). The experimental results of 2-D circular cylinder flow around an interval. In the low turbulence uniform flow field and the high turbulence atmospheric boundary laminar flow field, the pressure measurement wind tunnel tests of cooling tower rigid model were carried out under four different wind speeds and eight kinds of roughness, respectively. The results of wind tunnel test under the condition of low Reynolds number (2.1 脳 10 ~ (-1) -4.19 脳 10 ~ (5)) and high Reynolds number (Re5.4 脳 10 ~ (7) ~ (-1) 脳 10 ~ (8)) were compared. The variation of various static and dynamic flow characteristics with Reynolds number is studied. The research results show that the flow around a cylinder with surface relative roughness is above 0.01. The phenomenon of uncorrelated Reynolds number exists in a wide range of Reynolds numbers (2 脳 10 ~ (5) Re1 脳 10 ~ (8)). Increasing the turbulence of incoming flow can also cause Reynolds number independent phenomenon, but this phenomenon may only exist in a narrow range of low Reynolds number at this time.
【作者单位】：同济大学土木工程防灾国家重点实验室;南京工业大学土木工程学院;
【基金】：国家自然科学基金(批准号:51222809,51178353) 科技部重大科技项目(批准号:2009ZX06004-010-HYJY-21) 教育部新世纪优秀人才支持计划资助的课题~~
【分类号】：O357.5
【正文快照】： 1引言圆柱绕流是流体力学领域的经典问题,相关研究不仅具有理论意义,更有实际应用价值.例如,相关成果可以作为各国制定各种大型圆截面建筑物设计规范风荷载条款的基本依据.尽管开展了大量有关风洞试验研究,但由于条件的限制,绝大部分的试验工作是在超临界雷诺数(Re)范围以下

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