出口雷诺数对平面射流自保持性的影响 [Effect of exit Reynolds number on self-preservation of a plane jet]

米建春 [Mi, Jian-Chun], 冯宝平 [Feng, Bao-Ping], Deo, Ravinesh C. and Nathan, Graham J. (2009) 出口雷诺数对平面射流自保持性的影响 [Effect of exit Reynolds number on self-preservation of a plane jet]. 物理学报 (Wuli Xuebao) [Acta Physica Sinica], 58 11: 7756-7764.


Author 米建春 [Mi, Jian-Chun]
冯宝平 [Feng, Bao-Ping]
Deo, Ravinesh C.
Nathan, Graham J.
Title 出口雷诺数对平面射流自保持性的影响 [Effect of exit Reynolds number on self-preservation of a plane jet]
Journal name 物理学报 (Wuli Xuebao) [Acta Physica Sinica]   Check publisher's open access policy
ISSN 1000-3290
1674-1056
1741-4199
1009-1963
Publication date 2009-11
Sub-type Article (original research)
Volume 58
Issue 11
Start page 7756
End page 7764
Total pages 9
Place of publication Taipei, Taiwan
Publisher 中国物理学会 (Zhongguo Wuli Xuehui) [The Physical Society of the Republic of China]
Language chi
eng
Subject 01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Formatted abstract
通过实验研究出口雷诺数对平面湍流射流自保持性的影响. 测量的射流来自相同的喷嘴但不同的雷诺数Re(≡Ujh/ν,其中Uj是出口平均速度、h是窄缝出口的厚度和ν是黏性系数),其变化范围是Re=4582—57735.所得的数据包括沿轴线的平均速度、湍流强度、积分尺度、高阶矩和能谱. 实验发现,随着Re的增大,平面射流发展减慢,平均速度和湍流强

We investigated in experiment the effect of exit Reynolds number on self-preservation of a turbulent plane jet. Centerline velocity statistics were measured in plane jets issuing from the same nozzle but, respectively,  with seven Reynolds numbers varying between Re = 4,582 and Re = 57,735, where ReUj h/ν (Uj being the momentum-averaged exit mean velocity, h the slot height and ν the kinematic viscosity). All measurements were conducted using single hot-wire anemometry and over an axial distance (x) of 40 h. These measurements revealed a significant Re-dependence of either the mean or turbulent flow field. As Re increases, the pace of the jet development decreases and, as a result, both the mean and turbulent properties reach their self-preserving states over a longer downstream distance (x). The centerline integral scale L for all jets grows linearly with x and the growth rate decreases as Re is increased. It is also found that the local Reynolds number ReL scales with x as ReLx1/2. The study suggests that differences of the self-preserving states observed may be related to the differences in the underlying turbulence structures in the near field of the seven jets.
©2009 Chin. Phys. Soc.
Keyword 平面射流
雷诺数
自保持性
Plane jet
Reynolds number
Self-preservation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Abstract only in English.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Geography, Planning and Environmental Management Publications
 
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Created: Mon, 04 Oct 2010, 14:56:44 EST by Jon Swabey on behalf of Faculty of Science