| 马吉明,吴保生.具有 Riblets 边界面的粘弹性流体速度分布的实验研究[J].水利学报,2003,34(1):0017-0020 |
| 具有 Riblets 边界面的粘弹性流体速度分布的实验研究 |
| Experiment study on turbulent velocity distributions of viscous-elastic fluid flow with rib-lets boundary |
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| DOI： |
| 中文关键词: 紊流 粘弹性流体 Riblets 壁面 流速 |
| 英文关键词: turbulent viscous-elastic fluid rib-lets wall velocity distribution |
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| 摘要点击次数: 2047 |
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| 中文摘要: |
| 利用激光测速手段研究了明槽中 Riblets 边界上粘弹性流体流动的速度分布。实验证实，粘弹性流动在具有三角形的 Riblets 底边界时，其粘性底层与紊流核心区内的时均速度分布与窦国仁[1]提出的粘弹性流体速度分布的理论公式很接近。在过渡区，时均速度的理论值与实测值存在着一定程度的差别，这反映了 Riblets 的影响。根据试验值，文中用试错法对窦氏公式予以修正，用其表述在具有 Riblets 底边界时的粘弹性流动的时均速度分布。对于脉动速度，实验表明其最大强度出现在过渡区，且该区域较之具有光滑壁面的清水流动的范围为宽。实验还显示， Riblets 底边界存在的情况下，脉动速度与窦氏理论值是很接近的。理论预报值略高于实测值。 |
| 英文摘要: |
| An exerimental study was conducted concerning the velocity distributions of diluted polymer solution flow in a two dimensional open channel with rib-lets boundary. The measured data with LDV in viscous sub-layer and turbulent zone were in a reasonable good agreement with Dou's theoretical formula. In the transition zone, some differences were observed, which were considered as the effects of the rib-lets. A modified formula was proposed to indicate the time-average velocity distributions of diluted polymer with rib-lets boundary. The viscous sub-layer zone and the transition zone where the maximum strength of pulse arises were observed It also demonstrated that pulse velocity distributions in the channel with rib-lets boundary were quite close to those of theoretical calculations by Dou's formula. |
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