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Flow characteristic of highly underexpanded jets from various nozzle geometries
Li XP(李晓鹏); Zhou, Rui; Yao W(姚卫); Fan XJ(范学军); Fan, XJ (reprint author), Chinese Acad Sci, State Key Lab High Temp Gas Dynam, Inst Mech, Beijing 100190, Peoples R China.
Source PublicationAPPLIED THERMAL ENGINEERING
2017-10-01
Volume125Pages:240-253
ISSN1359-4311
Abstract

Flow characteristics of highly underexpanded jets at the same nozzle pressure ratio of 5.60 but issuing from four different nozzles, i.e., the circular, elliptic, square, and rectangular nozzles, are studied using large eddy simulations. The results show that the square jet penetrates fastest, although the turbulence transition is similar for different jets. The penetration rates of different jets show the similar linear dependency on the square root of time, but the penetration constant Gamma for the noncircular jets deviates more than 5% from the theoretical value of 3.0. The circular and square jets both correspond to a three-dimensional helical instability mode, while the elliptic and rectangular jets haveatwo-dimensional flapping instability in their minor axis planes. All the jets undergo a Mach reflection forming the Mach disk, but the Mach disk in the elliptic and rectangular jets is not easily visible. The intercepting shocks in the square jet originate at the four corners of the nozzle exit at first, while the formation of the intercepting shocks is only observed in the major axis planes for the elliptic and rectangular jets. In addition, great differences are observed on the mixing characteristics between different jets. In particular, the elliptic jet penetrates slowest, has the shortest length of jet potential core, and takes the largest mixing area. (C) 2017 Elsevier Ltd. All rights reserved.

KeywordUnderexpanded Jets Noncircular Jets Nozzle Geometry Large Eddy Simulation
DOI10.1016/j.applthermaleng.2017.07.002
Indexed BySCI ; EI
Language英语
WOS IDWOS:000410011200023
Funding OrganizationThis project was funded by the National Natural Science Foundation of China (Grant Nos. 11502270 and 11602028) and China Postdoctoral Science Foundation (No. 2016M591258).
DepartmentLHD超声速燃烧
Classification一类
Ranking1
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60936
Collection高温气体动力学国家重点实验室
Corresponding AuthorFan, XJ (reprint author), Chinese Acad Sci, State Key Lab High Temp Gas Dynam, Inst Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Li XP,Zhou, Rui,Yao W,et al. Flow characteristic of highly underexpanded jets from various nozzle geometries[J]. APPLIED THERMAL ENGINEERING,2017,125:240-253.
APA Li XP,Zhou, Rui,Yao W,Fan XJ,&Fan, XJ .(2017).Flow characteristic of highly underexpanded jets from various nozzle geometries.APPLIED THERMAL ENGINEERING,125,240-253.
MLA Li XP,et al."Flow characteristic of highly underexpanded jets from various nozzle geometries".APPLIED THERMAL ENGINEERING 125(2017):240-253.
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