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| 2007 | 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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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.
| | Mr Rainer Kirchhartz,  Emeritus Professor Raymond Stalker,  Professor David Mee | | eSpace Record: |
http://espace.library.uq.edu.au/view/UQ:120854
| | | | | Links: | Conference proceedings |
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