规则床面形态对水流结构影响试验研究(王宪业; 杨青远; 卢伟真; 王协康)

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【作者】王宪业; 杨青远; 卢伟真; 王协康 【作者单位】香港城市大学建筑系; 四川大学水力学与山区河流开发保护国家重点实验室水利论文{%P#Q1E%qZ

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C*k5s'v4b0【论文摘要】 本研究针对由均匀粒径(d=2cm)泥沙颗粒铺设的卵砾石河床,应用声学多普勒流速仪进行水槽试验,得到近壁面处的流速、雷诺应力和紊动强度分布.试验结果表明:靠近壁面处,水流的侧向流速明显增加,在泥沙颗粒的间隔区域,产生了漩涡,使时均流速降低, 近壁面处流速梯度增加;在相对淹没深度(粒径/水深)为12.75时,床面对水流的影响发展到0.2倍水深;随着测量位置的变化,时均流速分布在近壁区偏离对数律,在0.1h 左右偏离最大,主流区流速分布仍遵循对数律;雷诺应力随着离开床面距离的增加其绝对值增大,在 0.1h 附近达到极值,在床面0.2h 以上为线性分布;三个方向的紊动强度有相同的变化趋势, 在0.13h 时到达最大值,其中纵向紊动强度绝对值最大.

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F6Z^4C,W|)~N0【英文论文摘要】 Flow structure of near-bed was measured using Acoustic Doppler Velocimeter on a paved regular gravel bed consisted of uniform grain size bed material,velocity profile,turbulent intensity and Reynolds Stress distribution were also calculated.The results showed:Flow structure near bed tended to three-dimensional,velocity profile occurred deviation near the wall about 2.0 cm height from boundary,and velocity profile was still consistent with the logarithmic law in outer layer; Reynolds stress above 2.0 cm bed declined with linearity and in the near-wall region increased with height;turbulent intensity reached the maximum in relative height of 0.13.At a distance of about 2.0 cm from bed,the turbulence intensity is linear.Horizontal and vertical turbulent intensity changes along the depth in the same trend,but the absolute value was relatively small.

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$J ~~C{&I6W0【论文关键词】 明渠; 近底水流; 床面形态; 声学多普勒流速仪水利论文!NS%]?R r*uoi
【英文论文关键词】 open channel; near-wall flow; flow structure; Acoustic Doppler Velocimeter水利论文[,q6?8G Z@3u
【基金】国家自然科学基金项目资助(40771022);; 香港城市大学研究基金7002027(BC),7002226(BC);; 2006年教育部新世纪优秀人才支持计划(NCET-06-0792).水利论文y$P!Zb0qQ*^
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TAG: 水流 王协康 杨青远 卢伟真 王宪业
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