矩形管湍流冲击射流场的PIV实验研究.pdf

第19卷第1期
实验流体力学
2005年03月
Journal of Experiments in Auid Mec hanics
Mar.,2005
文章编号:1672-9897(2005)01-0087-07
矩形管湍流冲击射流场的PI实验研究
陈庆光徐忠2,吴玉林.张永建,张永超
(1.清华人学热能工程系,北京10004:2.西交交通人学流体工程系,陕西西交710049:3.山东科技人学,山
东青品266510)
摘要:淌流冲射流在工程和年事工业中都具有广泛的应用。采用粒子图像测速(PM)技术,在射流雷诺数为
20000喷口-冲击板间距为4倍喷管水力直径的条件ド,对知形管淌流冲击射流场进行了实验测,得到了主射
流区和沖击区附近测星戗面上的平均速度和涡星分布。结果表明,由于射流的卷吸及其与环境流体之阆的相互作
用,使得射流边界处具有很高的渴量;在流场的流出区域存在一个显著的回流区,这是半封闭击射流场的特征结
构之
关健词:三维湍沇流;沖击射流;粒图像测速
中图分类号:O354.7文献标识码
Experimental study on rectangular turbulent impinging jet
flow field by PTY technique
CHEN Qing guang, XU Mong, WU Yu-lin, ZHANG Yon jian, ZHANG Yong chao
I. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China 2. Department of Fluid
Engineering, Xi an Jiaotong University, Xi an 710049, China; 3. Shandong University of Science and Teclr
mology, Qingdao 266510, China)
Abstract: Turbulent impinging jets are widely used in engineering and military industrial field. The flow
field of a rectangular turbulent impinging jet has been measured experimentally by the PIV technique. The ex
periment has been carried out for Re nlds number of 20000 and for mze- to-plate spacing of four times of the
hydraulic diameter of the jet pipe. Distributions of average velocity and vorticity on different cut planes located
in the main jet region and the impingement region have been obtained. It has shown from the experimental re
sults that te vorticity near the jet boundary region is high in magnitude due to the interaction between the jet
fluid and the entrained ambient fluid. An obvious recirculation one has also been found in the outflow region
of the field, which is one of the characteristics of the semr-confined impinging jet flow field
Key words: three- dimensional turbulent flow; impinging jet; PV
0引言
冻手术中组织的冷冻等工程领域;V/STOL(垂直或短
鉅离起落)军用飞机在起飞和低空盘旋时,?力射流
渦流冲击射流由于其冲击表面时具有很高的局与地面之间强烈的空气动力作用也沙及到冲击射流
部热率,被广泛应用」诸如纺纠物、薄膜和纸张的的问题;作为一种独特的流动形式,沖击射流也常被
干燥,材料的热处理,燃气涡轮部件和喷射发动机燃作为理想的测试实例用来评价湍流模型对复杂流动
烧室外壁的冷却,机翼除冰,电子元件的冷却以及冷的预测能力山。虽然这种流动通常具有相对简单的
收稿日期:2004-0415;修订日期:200408-05
作者简介:陈庆光(196),男,山东莒南人、副教授,博士.研究方向:流体机械内部流动与传热的实验与数值研究.
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