波流环境下双孔射流的运动和稀释特性  

Motion and dilution characteristics of dual-jets in wavy-crossflow environment

作　　者：江东勃 陈永平[1,2] 田万青[1,2] 孙朴[1,2] 王娅娜[1,2] 

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,南京210098 [2]河海大学港口海岸与近海工程学院,南京210098

出　　处：《中国科技论文》2016年第19期2260-2264,2272,共6页China Sciencepaper

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)

摘　　要：为了研究波流环境下双孔射流的运动和稀释特性,分别采用粒子图像测速(PIV)和平面荧光诱导(PLIF)技术对其速度场和浓度场进行了测量,结合波浪周期性变化的特点对波流环境下射流的运动形态进行了定性分析,同时将波流和横流环境下射流平均速度场和浓度场的分布差异进行了定量比较。结果表明,在波流环境下,部分射流水体周期性地被抛出射流主体形成"云团",使射流分布范围加宽,有助于双孔射流的稀释;相对于横流环境,在波流环境下前方射流对后方射流的遮挡作用大大减小,前、后方射流速度偏转程度均比横流环境更加明显,其迎流面和背流面的浓度分布则更加均匀。To understand the motion and dilution characteristics of dual-jets under wavy-crossflow, velocity and concentration field were measured with PIV （particle image velocimetry） and PLIF （planar laser induced fluorescence） techniques. Based on the pe- riodic change of wave motion, the basic flow pattern of thedual-jets under wavy-crossflow was qualitatively evaluated. The time- averaged velocity and concentration field of the dual-jets under wavy-crossflow and crossflow were quantitatively compared. Re- suits showed that the dual-jets were periodically ejected out of the main body of the jet and ＂effluent clouds＂ were formed due to the existence of coexisting waves and crossflow, which will widen the distribution scope of the dual-jets and thus enhance their di- lution. Compared to the crossflow environment, the shielding effect were significantly reduced in thewavy-crossflow environment, resulting in a larger deflection and more evenly distributed concentration profiles in both upstream and lee sides.

关 键 词：双孔射流 波流环境 横流环境 运动特性 稀释特性 实验研究 

分 类 号：O358[理学—流体力学]