喷口间距对双矩形平行射流流场的影响

doi:10.11949/j.issn.0438-1157.20170380

化工学报 ›› 2017, Vol. 68 ›› Issue (10): 3708-3716.DOI: 10.11949/j.issn.0438-1157.20170380

喷口间距对双矩形平行射流流场的影响

刘鹏远, 张海, 吴玉新, 张缦, 吕俊复

清华大学热能工程系, 热科学与动力工程教育部重点实验室, 北京 100084

收稿日期:2017-04-10 修回日期:2017-06-15 出版日期:2017-10-05 发布日期:2017-10-05
通讯作者: 张海,haizhang@tsinghua.edu.cn
基金资助:
国家高技术研究发展计划项目（2015BAA04B01）。

Influence of nozzle spacing on mixing behavior of two parallel jets from rectangular nozzles

LIU Pengyuan, ZHANG Hai, WU Yuxin, ZHANG Man, LÜ Junfu

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

Received:2017-04-10 Revised:2017-06-15 Online:2017-10-05 Published:2017-10-05
Supported by:
supported by the National High Technology Research and Development Program of China(2015AA04B00).

摘要/Abstract

摘要：

用激光粒子测试仪（PIV）测量了双矩形喷口平行射流的流场特性，研究了不同喷口速度、不同喷口间距下双射流的混合特性。结果表明，喷口速度增大，双射流对称线上速度绝对值增大，但速度最大值出现的位置基本不变。喷口间距增大后，双射流的混合推迟，合并点后移，传递到对称线上的动量减弱，在合并点上的最大速度值减小。间距比与合并点的关系呈线性；但与大间距比相比，小间距比对合并点的影响更为敏感，关联式斜率更大。对湍流特性分析发现，双射流的主要动量传递发生在混合区，喷口间距增大，混合区与喷口的距离增加。

关键词: PIV, 双射流, 合并点, 湍流, 测量, 流体力学

Abstract:

Flow and mixing characteristics of two parallel jets were studied using PIV measurements at different velocities and distances between centers of two nozzles.The results showed that absolute velocity along symmetric line rose but the point of maximum combined velocity barely changed as velocities at nozzle exits were increased.With distance increase between two nozzles,the parallel jets displayed delay in merging process,moving down of combining point,decrease of momentum transported to the symmetric line,and reduce of maximum velocity at combining point.A linear relationship was observed between the spacing ratio and the combining point.Compared to large spacing ratio,small spacing ratio had more obvious impact on the combining point and thus the slope was larger.The turbulence characteristics indicated that main momentum transfer between the two parallel jets occurred in the merging region.As the spacing between two jets was increased,the merging region moved away from nozzle exits.

Key words: PIV, two parallel jets, combining point, turbulent flow, measurement, fluid mechanics

中图分类号:

刘鹏远, 张海, 吴玉新, 张缦, 吕俊复. 喷口间距对双矩形平行射流流场的影响[J]. 化工学报, 2017, 68(10): 3708-3716.

LIU Pengyuan, ZHANG Hai, WU Yuxin, ZHANG Man, LÜ Junfu. Influence of nozzle spacing on mixing behavior of two parallel jets from rectangular nozzles[J]. CIESC Journal, 2017, 68(10): 3708-3716.

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喷口间距对双矩形平行射流流场的影响

Influence of nozzle spacing on mixing behavior of two parallel jets from rectangular nozzles

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