波浪环境下多孔射流水动力特性试验

发布时间：2018-06-28 05:37

本文选题：多孔射流 + 波浪环境　；参考：《水科学进展》2016年04期

【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。
[Abstract]:In order to study the effect of wave on the motion and dilution process of porous jet, particle image velocimetry (PIV) and laser induced fluorescence (LIF) were used to measure the velocity field and concentration field of porous jet in wave environment. The results show that the porous jet in the wave environment can be divided into three regions, namely, the initial zone, the transition zone and the mixing zone. In the initial region, each hole jet maintains its own jet characteristics and has little influence on each other. In the transition zone, the hole jet forks and superposes with each other between the holes to form several confluence points. The peak value of average velocity and concentration shifts from the axis of the jet to the confluence point, and in the mixing region, the average velocity and concentration of the porous jet merge with each other, and the average velocity and concentration show a single "Tan peak" distribution. In form, the hydrodynamic characteristics of single-hole jet are presented. By comparison and analysis, it is found that the increase of wave height and period and the decrease of the initial velocity of the jet can make the position of the confluence point move downward, and the porous jet will enter the transition zone and the mixing area more quickly.
【作者单位】：河海大学水文水资源与水利工程科学国家重点实验室;河海大学港口海岸与近海工程学院;
【基金】：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)~~
【分类号】：TV131.2

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