Displacement effects and scaling of ducted, supersonic flames

Wendt, MN, Jacobs, PA and Stalker, RJ (1999) Displacement effects and scaling of ducted, supersonic flames. Combustion and Flame, 116 4: 593-604. doi:10.1016/S0010-2180(98)00069-8


Author Wendt, MN
Jacobs, PA
Stalker, RJ
Title Displacement effects and scaling of ducted, supersonic flames
Journal name Combustion and Flame   Check publisher's open access policy
ISSN 0010-2180
Publication date 1999-01-01
Sub-type Article (original research)
DOI 10.1016/S0010-2180(98)00069-8
Volume 116
Issue 4
Start page 593
End page 604
Total pages 12
Place of publication New York
Publisher Elsevier Science
Language eng
Subject C1
290299 Aerospace Engineering not elsewhere classified
690302 Space transport
Abstract The paper describes a study of the mechanisms for generating pressure increase within a ducted, supersonic hydrogen-air flame. The combustor consisted of a constant-area rectangular duct with a centrally located fuel injector strut that spanned the width of the duct. The free stream flows, with total enthalpies of 5.6, 6.5 and 8.9 MJ/kg, were provided by a free-piston shock tunnel and the fuel was injected from a Ludwieg tube. The wall pressure increase generated within the duct was successfully estimated by first reducing the effective core area of the duct by the combined displacement thickness of the mixing layers and wall boundary layers and then calculating the properties of the inviscid core flow assuming an isentropic compression. It was found that heat addition decreased the density of the mixing layer and subsequently increased its displacement thickness without greatly altering the layer's velocity profile. If pressure gradients and shock waves have only a minor effect on turbulence production then the displacement thickness of the mixing and boundary layers on be assumed to be independent of the height of the duct. If the duct height is changed, the resulting pressure distribution within the new duct can be predicted using the displacement thickness distribution from the original duct. The paper thus presents a form of scaling for supersonic combustion experiments. (C) 1998 by The Combustion Institute.
Keyword Thermodynamics
Energy & Fuels
Engineering, Multidisciplinary
Engineering, Chemical
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Tue, 10 Jun 2008, 23:46:59 EST