| 波浪环境下多孔射流水动力特性试验 |
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| 引用本文： | 陈永平,田万青,方家裕,江东勃.波浪环境下多孔射流水动力特性试验[J].水科学进展,2016,27(4):569-578. |
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| 作者姓名： | 陈永平 田万青 方家裕 江东勃 |
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| 作者单位： | 1.河海大学水文水资源与水利工程科学国家重点实验室, 江苏 南京 210098; |
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| 基金项目： | 国家自然科学基金资助项目(51379072);高等学校博士学科点专项科研基金资助项目(20120094110016)~~ |
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| 摘 要： | 为了研究波浪对多孔射流运动和稀释过程的影响,采用粒子图像测速（PIV）及激光诱导荧光（LIF）量测系统对波浪环境下多孔射流的速度场和浓度场进行了测量。结果表明:在波浪环境下多孔射流可分为3个区域,即初始区、过渡区和混合区。在初始区,各孔射流保持各自的射流特征,相互影响较小;在过渡区,各孔射流发生分叉,并在孔与孔之间相互叠加,形成若干个汇流点,平均速度和平均浓度的峰值从射流轴线位置向汇流点处偏移;在混合区,多孔射流相互融合,其平均速度和平均浓度呈现单一的“坦峰”分布,形式上表现为单孔射流的水动力特征。通过对比分析发现,波高和周期的增大以及射流初始速度的减小可使汇流点的位置向下偏移,多孔射流将更快地进入过渡区和混合区。
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| 关 键 词： | 多孔射流 波浪环境 粒子图像测速 激光诱导荧光 速度场 浓度场 |
| 收稿时间： | 2016-01-06 |
Experimental study on hydrodynamic characteristics of multiple jets in wave environment |
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| CHEN Yongping;TIAN Wanqing;FANG Jiayu;JIANG Dongbo.Experimental study on hydrodynamic characteristics of multiple jets in wave environment[J].Advances in Water Science,2016,27(4):569-578. |
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| Authors: | CHEN Yongping;TIAN Wanqing;FANG Jiayu;JIANG Dongbo |
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| Affiliation: | 1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China;2.College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | In order to study the impact of waves on the movement and dilution process of multiple jets, Particle Image Velocimetry (PIV) and Laser Induced Fluorescence (LIF) measurement systems are used to measure velocity field and concentration field under the wave environment. The results have shown that multiple jets can be divided into three zones under the wave environment:initial zone, transition zone and mixing zone. In the initial zone, respective characteristics of jet flows from various nozzles are maintained with smaller mutual influence; in the transition zone, bifurcation occurs on the jet flows, and several confluence points are formed through mutual superposition of the jet flows. The positions of peak values of average speed and concentration migrate from the centerlines of jet flows to the confluence points; in the mixing zone, due to integration of multiple jets flows, average speed and concentration are distributed in the form of single "flat peak". According to the comparative analysis, the position of confluence points will migrate downward and the multiple jets will enter into the transition zone and mixing zone more quickly with the increase of wave height and period, and the decrease of jet initial velocity. |
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| Keywords: | multiple jets wave environment Particle Image Velocimetry Laser Induced Fluorescence velocity field concentration field |
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