Effect of Boundary Layer Thickness and Entropy Layer on Boundary Layer Combustion

Kirchhartz, R. M., Mee, D. J. and Stalker, R. J. (2007). Effect of Boundary Layer Thickness and Entropy Layer on Boundary Layer Combustion. In: Peter Jacobs, Tim McIntyre, Matthew Cleary, David Buttsworth, David Mee, Rose Clements, Richard Morgan and Lemckert, C., Proceedings of Sixteenth Australasian Fluid Mechanics Conference. 16th Australasian Fluid Mechanics Conference (AFMC), Gold Coast, Queensland, Australia, (491-496). 3-7 December, 2007.

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Author Kirchhartz, R. M.
Mee, D. J.
Stalker, R. J.
Title of paper Effect of Boundary Layer Thickness and Entropy Layer on Boundary Layer Combustion
Conference name 16th Australasian Fluid Mechanics Conference (AFMC)
Conference location Gold Coast, Queensland, Australia
Conference dates 3-7 December, 2007
Convener School of Engineering, University of Queensland
Proceedings title Proceedings of Sixteenth Australasian Fluid Mechanics Conference
Journal name Proceedings of the 16th Australasian Fluid Mechanics Conference, 16AFMC
Place of Publication Brisbane, Australia
Publisher School of Engineering, The University of Queensland
Publication Year 2007
Year available 2007
Sub-type Fully published paper
Open Access Status File (Author Post-print)
ISBN 978-1-864998-94-8
Editor Peter Jacobs
Tim McIntyre
Matthew Cleary
David Buttsworth
David Mee
Rose Clements
Richard Morgan
Lemckert, C.
Volume 1
Start page 491
End page 496
Total pages 6
Collection year 2007
Language eng
Abstract/Summary This project investigates the possibilities of scramjet combustor performance enhancement by reducing the skin friction through boundary layer combustion. Experiments were conducted in the T4 Stalker tube to investigate the influence of boundary layer thickness and entropy layers on the ignition of a hydrogen air mixture near the wall of a constant area duct. The hydrogen was injected tangentially from a slot of annular cross section after an “injector” of constant area captured flow from a Mach 4 nozzle. Injectors of two different lengths and nose radii were employed to vary the thickness of the boundary layer at the injection location as well as the temperature of the gas near the walls and within the entropy layer created by the leading edge shocks of blunted leading edges. Results are presented of CFD simulations of the injector as well as experimentally measured pressure coefficient profiles along the combustor wall. It is shown that a thicker boundary layer will promote combustion but that heating the gas near the walls through a leading edge shock is more effective for ignition. However, the shocks generated by the leading edge may also influence the core flow of the constant area combustor and possibly cause some main stream mixing.
Subjects 290501 Mechanical Engineering
780102 Physical sciences
290299 Aerospace Engineering not elsewhere classified
Q-Index Code E1

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Created: Wed, 19 Dec 2007, 12:03:02 EST by Laura McTaggart on behalf of School of Engineering