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波流环境下多孔射流运动和稀释特性试验 预览 被引量:1

Experimental study on movement and dilution of multiple jets in wavy cross-flow
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摘要 采用PIV和PLIF技术对波流环境下多孔垂向射流近区的速度场和浓度场进行测量,对比分析不同波浪条件下射流运动轨迹、速度场、浓度场及涡量场特性,重点探讨波流和纯流环境下射流运动特性的差异以及波浪作用对多孔射流发展的影响。结果表明:波流流场中射流时均轨迹发生扭曲,产生“污染物云团”现象,与纯流环境下射流差异明显;波浪对波流环境下的多孔射流运动影响显著,具体表现在波浪强度的增大能够增加射流与环境水体的接触面积、加快射流垂向动量衰减、增强前方射流对后方射流的遮掩作用、降低多孔射流汇合点高度等方面。当前组次下,波浪的存在使得各断面污染物浓度峰值减小,因此对波流环境下多孔射流的稀释有积极的作用。 The near-field velocity and concentration fields of vertical multiple jets in wavy cross-flow were measured by using the PIV and PLIF techniques.The characteristics of multiple jets,including the trajectory,velocity field,concentration field and vorticity field,were analyzed,focusing on the differences between the jet in wavy cross-flow and that in cross-flow as well as the wave effect on the development of multiple jets.The results show that the time averaged trajectories of jets in wavy cross-flow are distorted with “effluent cloud” existing on the jet body.Further,wave has a significant influence on the movement of multiple jets in wavy cross-flow,including increasing the interaction area between jets and surrounding waters,accelerating the decay of the vertical momentum of jets,enhancing the shielding effect of leading jet on the rear jets,and reducing the height of the confluent point of the jets,etc.In present cases,waves lead to the decreasing of the peak concentration of contaminant at all sections,and thus have a positive effect on the dilution of multiple jets in wavy cross-flow.
作者 张玉玲 徐振山 陈永平 孙朴 ZHANG Yuling;XU Zhenshan;CHEN Yongping;SUN Pu(College of Harbor,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210098,China)
出处 《河海大学学报:自然科学版》 CAS CSCD 北大核心 2019年第1期71-78,共8页 Journal of Hohai University (Natural Sciences )
基金 国家自然科学基金(51709078) 江苏省自然科学基金(BK20170882).
关键词 波流环境 多孔射流 速度场 浓度场 污染物稀释特性 射流试验 wavy cross-flow multiple jets velocity field concentration field effluent dilution characteristics jet experiments
作者简介 张玉玲(1994—),女,硕士研究生,主要从事河口海岸水动力环境研究。E-mail:yuling_zhang@hhu.edu.cn;通信作者:徐振山,讲师。E-mail:zsxu2006@hhu.edu.cn
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