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Injection and Mixing in a Scramjet Combustor: DES and RANS Studies

You, Yancheng and Lüdeke, Heinrich and Hannemann, Klaus (2012) Injection and Mixing in a Scramjet Combustor: DES and RANS Studies. 34th International Symposium on Combustion, Warschau, Polen.

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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 Omega-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 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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Injection and Mixing in a Scramjet Combustor: DES and RANS Studies
Authors:
AuthorsInstitution or Email of Authors
You, YanchengUNSPECIFIED
Lüdeke, HeinrichUNSPECIFIED
Hannemann, KlausUNSPECIFIED
Date:2012
Status:Published
Keywords:injection, mixing, scramjet, combustor
Event Title:34th International Symposium on Combustion
Event Location:Warschau, Polen
Event Type:international Conference
Organizer:The Combustion Institute
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 - EU Projekte Raumtransport
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Dr.-Ing. Heinrich Lüdeke
Deposited On:20 Nov 2012 15:23
Last Modified:26 Nov 2012 14:31

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