PIV measurements of turbulent jets issuing from triangular and circular   orifice plates

doi:10.1007/s11433-013-5099-0

CORC > 北京大学 > 工学院

	PIV measurements of turbulent jets issuing from triangular and circular orifice plates
	Xu MinYi ; Zhang JianPeng ; Mi JianChun ; Nathan, G. J. ; Kalt, P. A. M.
刊名	science china physics mechanics astronomy
	2013
关键词	triangular jet turbulent mixing coherent structures axis-switching NONCIRCULAR JETS COHERENT STRUCTURE ELLIPTIC JETS FLOW DYNAMICS ENTRAINMENT FIELD LAYER
DOI	10.1007/s11433-013-5099-0
英文摘要	The present study experimentally investigated the near-field flow mixing characteristics of two turbulent jets issuing from equilateral triangular and circular orifice plates into effectively unbounded surroundings, respectively. Planar particle image velocimetry (PIV) was applied to measure the velocity field at the same Reynolds number of Re=50,000, where Re = U (e) D (e)/nu with U (e) being the exit bulk velocity and nu the kinematic viscosity of fluid, D (e) the equivalent diameters. The instantaneous velocity, mean velocity, Reynolds stresses were obtained. From the mean velocity field, the centreline velocity decay rate and half-velocity width were derived. Comparing the mixing characteristics of the two jets, it is found that the triangular jet has a faster mixing rate than the circular counterpart. The triangular jet entrainments with the ambient fluid at a higher rate in the near field. This is evidenced by a shorter unmixed core, faster Reynolds stress and centreline turbulence intensity growth. The primary coherent structures in the near field are found to break down more rapidly in the triangular jet as compared to the circular jet. Over the entire measurement region, the triangular jet maintained a higher rate of decay and spread. Moreover, all components of Reynolds stress of the triangular jet appear to reach their peaks earlier, and then decay more rapidly than those of the circular jet. In addition, the axis-switching phenomenon is observed in the triangular jet.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000319072700019&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Physics, Multidisciplinary; SCI(E); EI; 4; ARTICLE; 6; 1176-1186; 56
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/223186]
专题	工学院
推荐引用方式 GB/T 7714	Xu MinYi,Zhang JianPeng,Mi JianChun,et al. PIV measurements of turbulent jets issuing from triangular and circular orifice plates[J]. science china physics mechanics astronomy,2013.
APA	Xu MinYi,Zhang JianPeng,Mi JianChun,Nathan, G. J.,&Kalt, P. A. M..(2013).PIV measurements of turbulent jets issuing from triangular and circular orifice plates.science china physics mechanics astronomy.
MLA	Xu MinYi,et al."PIV measurements of turbulent jets issuing from triangular and circular orifice plates".science china physics mechanics astronomy (2013).