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Injection and mixing in a scramjet combustor: DES and RANS studies

You, Yangcheng and Lüdeke, Heinrich and Hannemann, Klaus (2013) Injection and mixing in a scramjet combustor: DES and RANS studies. Proceedings of the Combustion Institute, Vol. 34 (2), pp. 2083-2092. Elsevier. DOI: 10.1016/j.proci.2012.10.001 ISSN 1540-7489

Full text not available from this repository.

Official URL: http://www.elsevier.com/locate/proci

Abstract

The low momentum flux ratio jet in the HyShot II scramjet combustor is studied by DES (Detached Eddy Simulation) and RANS (Reynolds-Averaged Navier–Stokes) methods. The flow structure near the injector, shock pattern in the symmetry plane as well as the instantaneous coherent structures are presented and explained. Further insight into the flow physics is obtained by visualizing instantaneous coherent structures. The formation of Ω-shaped vortices, which was previously observed in experiments but never well-studied numerically, is discussed in detail. A new schematic of flow physics is proposed to enhance the understanding of the low momentum flux ratio jet. Compared to the DES result, the RANS method is unable to capture the dynamics of turbulent structures. The DES method provides much detailed information about mixing patterns and a more reliable mixing efficiency than the RANS result. The RANS method over-predicts the eddy-viscosity during turbulence modeling and suppresses unsteady turbulent fluctuations by time averaging, which results in a 25% over-estimation of the mixing efficiency.

Item URL in elib:https://elib.dlr.de/80514/
Document Type:Article
Additional Information:Published online: 23. October 2012
Title:Injection and mixing in a scramjet combustor: DES and RANS studies
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
You, YangchengXiamen University, ChinaUNSPECIFIED
Lüdeke, HeinrichUNSPECIFIEDUNSPECIFIED
Hannemann, KlausUNSPECIFIEDUNSPECIFIED
Date:2013
Journal or Publication Title:Proceedings of the Combustion Institute
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:Vol. 34
DOI :10.1016/j.proci.2012.10.001
Page Range:pp. 2083-2092
Publisher:Elsevier
Series Name:SciVerse ScienceDirect
ISSN:1540-7489
Status:Published
Keywords:Injection; Mixing; Scramjet; Combustor; Detached Eddy Simulation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Brennecke-Hosseinzadeh, Dagmar
Deposited On:14 Jan 2013 15:36
Last Modified:02 Oct 2013 14:55

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