| 鸭嘴阀扩散器紊动射流特性试验研究 |
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| 引用本文： | 唐洪武,李行伟.鸭嘴阀扩散器紊动射流特性试验研究[J].水科学进展,2001,12(2):153-159. |
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| 作者姓名： | 唐洪武 李行伟 |
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| 作者单位： | 1.河海大学水利水电工程学院, 江苏南京210098; |
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| 基金项目： | 香港资助委员会和香港大学资助项目 |
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| 摘 要： | 采用超声多普勒流速仪(ADV)和激光诱导荧光技术(LIF),对鸭嘴阀扩散器的紊动扩散掺混特性进行研究,结果表明:当在出口下游12.5D(D为孔径)范围内,鸭嘴阀扩散器的在主、次轴平面内的射流扩散特性有明显的差异,出现"轴开关"现象,在此区域内,紊动强度也较圆孔射流高出几倍;远区,射流扩散特性与圆射流相似.
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| 关 键 词： | 鸭嘴阀 扩散器 紊动射流 超声多普勒流速仪 激光诱导荧光技术 |
| 文章编号： | 1001-6791(2001)02-0153-07 |
| 收稿时间： | 2000-04-10 |
| 修稿时间： | 2000年4月10日 |
Experimental Study on Characteristics of Turbulent Jet for Duck-Bill Valve Diffuser |
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| TANG Hong-wu,JOSEPH H. W. Lee.Experimental Study on Characteristics of Turbulent Jet for Duck-Bill Valve Diffuser[J].Advances in Water Science,2001,12(2):153-159. |
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| Authors: | TANG Hong-wu JOSEPH H W Lee |
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| Institution: | 1.College of water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China;2.Department of Civil Engineering, The University of Hongkong, Hongkong |
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| Abstract: | Recently,the duckbill-shaped elastomer check valves have installed on many oceanic outfalls and diffusers to prevent sea water and sediment intrusion.In this paper,the mixing characteristics of a duckbill valve jet has been studied by using acoustic Doppler velocimeter(ADV) and laser-induced fluorescence(LIF) techniques.The measurement results reveal a complicated near-field flow extending up to about 12.5 jet diameters,within which the turbulence intensity is much higher than that of a round jet,the jet spreading in the major and minor axes are distinctly different,and an axis-switching is observed in this region.Beyond.the near-field,however,the jet mixing characteristics are similar to an equivalent round jet. |
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| Keywords: | Duck-bill valve diffuser turbulent jet acoustic Doppler velocimeter laser induced fluores-cence technique |
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