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。
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.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2001年第2期153-159,共7页
Advances in Water Science
基金
香港资助委员会和香港大学资助项目
关键词
鸭嘴阀
扩散器
紊动射流
超声多普勒流速仪
Duck-bill
valve diffuser
turbulent jet
acoustic Doppler velocimeter
laser induced fluorescence technique
