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Numerical Simulations of Flowfields in a Central-Dump Ramjet Combustor. 3. Effects of Chemistry.

Author: Kazhikathra Kailasanath; John H Gardner; Jay P Boris; Elaine S Oran; NAVAL RESEARCH LAB WASHINGTON DC.
Publisher: Ft. Belvoir Defense Technical Information Center 23 JUL 1990.
Edition/Format:   Print book : English
Database:WorldCat
Summary:
This report is the third in a series which presents the results of numerical simulations performed to isolate and study acoustic-vortex-chemical interactions in an idealized ramjet consisting of an axisymmetric inlet and combustor and a choked nozzle. Both reactive and nonreactive flows have been simulated. The nonreactive flow calculations show complex interactions among the natural instability frequency of the  Read more...
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Document Type: Book
All Authors / Contributors: Kazhikathra Kailasanath; John H Gardner; Jay P Boris; Elaine S Oran; NAVAL RESEARCH LAB WASHINGTON DC.
OCLC Number: 227759372
Description: 52 pages

Abstract:

This report is the third in a series which presents the results of numerical simulations performed to isolate and study acoustic-vortex-chemical interactions in an idealized ramjet consisting of an axisymmetric inlet and combustor and a choked nozzle. Both reactive and nonreactive flows have been simulated. The nonreactive flow calculations show complex interactions among the natural instability frequency of the shear layer at the inlet-combustor junction and the acoustics of both the inlet and the combustor. The entire flow oscillates at a low frequency which corresponds to that of a quarter-mode in the inlet. For the reactive flow cases studied, energy release alters the flow field substantially. Energy release in a large vortex is in phase with the pressure oscillation over a substantial region of the combustor and results in the observed amplification of the low-frequency oscillations and leads to combustion instability. The large pressure oscillation also modifies the vortex shedding process. Keywords: Ramjet, Turbulence, Combustion instability. (jes).

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