横流中多孔射流流动特性实验研究  

An experimental study on hydrodynamics of multiple tandem jets in cross flow

作　　者：肖洋[1,2] 雷鸣[2] 李开杰[1,3] 刘贵平[2] 闫静[2] 

机构地区：[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 [2]河海大学水利水电学院,江苏南京210098 [3]国家防汛抗旱总指挥部办公室,北京100053

出　　处：《水科学进展》2012年第3期390-395,共6页Advances in Water Science

基　　金：国家自然科学基金资助项目(50879020);国家重点实验室专项经费资助项目(2010585512)~~

摘　　要：横流中多孔射流的流动特性是揭示其输移扩散机理的基础。利用粒子图像测速技术PIV测量了横向流动条件下单孔、两孔和四孔射流的速度场,对射流主体范围内、射流的迎流面和各个射流之间的流场进行了研究。实验研究表明,多个射流中的第1个射流迎流面卷吸强度明显大于单个射流情况;两个射流之间的区域可分为两个部分,上游部分水体被卷吸进入上一个射流,下游部分水体被卷吸进入下一个射流;后面射流迎流面的横向流速明显低于第1个射流迎流面的横向流速,揭示了导致后面射流弯曲的横向有效流速沿程发展变化过程;揭示了横向有效流速的沿程变化规律。Understanding of flow characteristics of multiple tandem jets is essential to the study on the mechanism of diffusion and ionic transport in the jets. In this study, a particle image velocimetry technique is used to measure the hydrodynamics of multiple tandem jets in cross flow with l, 2, 4 nozzles. The experimental results show that the en- trainment on the front face of the first jet in a nozzle group is apparently stronger than that of a single jet. The region between two jets can be divided into two parts. The flow in the upstream part of the region is entrained into the front jet, while the flow in the downstream part will be entrained into the rear jet. The cross flow velocities in front of the rear jets are apparently smaller than that of the first jet. There exists an effective cross flow velocity that makes the rear jet bends.

关 键 词：多孔射流 横向流动 粒子图像测速 横向有效流速 

分 类 号：TV132.1[水利工程—水力学及河流动力学]