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Shock oscillation in highly underexpanded jets
Li XP; Zhou R; Chen XP; Fan XJ(范学军); Xie GS
Source PublicationCHINESE PHYSICS B
2018-09-01
Volume27Issue:9Pages:94705
ISSN1674-1056
Abstract

The oscillatory motions of shocks in highly underexpanded jets with nozzle pressure ratios of 5.60, 7.47, 9.34, and 11.21 are quantitatively studied by using large eddy simulation. Two types of shock oscillations are observed: one is the Mach disk oscillation in the streamwise direction and the other is the shock oscillation in the radial direction. It is found that the Mach disk moves quickly in the middle of the oscillatory region but slowly at the top or bottom boundaries. The oscillation cycles of Mach disk are the same for different cases, and are all dominated by an axisymmetric mode of 5.298 kHz. For the oscillation in the radial direction, the shocks oscillate more toward the jet centerline but less in the jet shear layer, and the oscillation magnitude is an increasing function of screech amplitude. The cycles of the radial shock oscillation switch randomly between the two screech frequencies for the first two cases. However, the oscillation periodicity is more complex for the jets with high nozzle pressure ratios of 9.34 and 11.21 than for the jets with the low nozzle pressure ratios of 5.6 and 7.47. In addition, the shock oscillation characteristics are also captured by coarse mesh and Smagorinsky model, but the coarse mesh tends to predict a slower and weaker shock oscillation.

Keywordhighly underexpanded jets shock oscillation large eddy simulation
DOI10.1088/1674-1056/27/9/094705
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000445021100005
WOS KeywordLARGE-EDDY SIMULATION ; UNDER-EXPANDED HYDROGEN ; SUPERSONIC JET ; METHANE JETS ; SCREECH ; NOISE ; PRESSURE ; ENGINES ; FLOWS ; FIELD
WOS Research AreaPhysics, Multidisciplinary
WOS SubjectPhysics
Funding OrganizationNational Natural Science Foundation of China [11602028] ; Science and Technology Project of General Administration of Quality Supervision Inspection and Quarantine of China [2017QK119, 2017QK188]
CSCD IDCSCD:6342848
ClassificationQ3
Ranking4
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/77940
Collection高温气体动力学国家重点实验室
Affiliation1.China Special Equipment Inspect & Res Inst, Beijing 100029, Peoples R China
2.Inst Appl Phys & Computat Math, Lab Computat Phys, Beijing 100094, Peoples R China
3.Zhejiang Sci Tech Univ, Key Lab Fluid Transmiss Technol Zhejiang Prov, Hangzhou 310018, Zhejiang, Peoples R China
4.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Li XP,Zhou R,Chen XP,et al. Shock oscillation in highly underexpanded jets[J]. CHINESE PHYSICS B,2018,27(9):94705.
APA Li XP,Zhou R,Chen XP,Fan XJ,&Xie GS.(2018).Shock oscillation in highly underexpanded jets.CHINESE PHYSICS B,27(9),94705.
MLA Li XP,et al."Shock oscillation in highly underexpanded jets".CHINESE PHYSICS B 27.9(2018):94705.
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