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Incipient thermal choking and stable shock-train formation in the heat-release region of a scramjet combustor: Part II: Large eddy simulations

Larsson, Johan and Laurence, Stuart Jon and Bermejo-Moreno, Ivan and Bodart, Julien and Karl, Sebastian and Vicquelin, Ronan (2015) Incipient thermal choking and stable shock-train formation in the heat-release region of a scramjet combustor: Part II: Large eddy simulations. Combustion and Flame, 162 (4), pp. 907-920. Elsevier. DOI: 10.1016/j.combustflame.2014.09.017 ISSN 0010-2180

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Official URL: http://dx.doi.org/10.1016/j.combustflame.2014.09.017

Abstract

The flow in the HyShot II scramjet combustor is studied using large eddy simulations (LES). The computations are made feasible by two important modeling ingredients: an equilibrium wall-model and a flamelet-based combustion model. The first objective of the study is to assess the accuracy of this modeling approach through a validation study. Comparisons are made between simulation results and those from shock-tunnel experiments at nominal flow conditions, with favorable agreement. The second objective is to study the flow for increased fuel/air equivalence ratios (ERs). A qualitative change in the flow occurs for ER & 0.39, with the appearance of a seemingly stable combustor shock-train, similar to standard isolator shock-trains, but occurring spatially co-located with the combustion and heat release. This behavior accurately reproduces that seen in an accompanying experimental study. A detailed flow analysis identifies the factors contributing to the stabilization of the shock train, and estimates are made of its effect on the overall combustor performance.

Item URL in elib:https://elib.dlr.de/89198/
Document Type:Article
Additional Information:Published online: 23.Oct. 2014, April 2015
Title:Incipient thermal choking and stable shock-train formation in the heat-release region of a scramjet combustor: Part II: Large eddy simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Larsson, JohanCenter of Turbulence Research, Stanford UniversityUNSPECIFIED
Laurence, Stuart JonDept. of Aerospace Engineering, University of MarylandUNSPECIFIED
Bermejo-Moreno, IvanCenter of Turbulence Research, Stanford UniversityUNSPECIFIED
Bodart, JulienCenter of Turbulence Research, Stanford UniversityUNSPECIFIED
Karl, Sebastiansebastian.karl (at) dlr.deUNSPECIFIED
Vicquelin, RonanEcole Centrale ParisUNSPECIFIED
Date:2015
Journal or Publication Title:Combustion and Flame
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:162
DOI :10.1016/j.combustflame.2014.09.017
Page Range:pp. 907-920
Publisher:Elsevier
ISSN:0010-2180
Status:Published
Keywords:scramjet combustor, flamelet-based combustion, nominal flow conditions, shock-tunnel experiments
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: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Micknaus, Ilka
Deposited On:08 Dec 2014 12:39
Last Modified:10 Jan 2019 15:46

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