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Title: Large-scale coherent structures as drivers of combustion instability

Abstract

The role of flow coherent structures as drivers of combustion instabilities in a dump combustor was studied. Results of nonreacting tests in air and water flows as well as combustion experiments in a diffusion flame and dump combustor are discussed to provide insight into the generation process of large-scale structures in the combustor flow and their interaction with the combustion process. It is shown that the flow structures, or vortices, are formed by interaction between the flow instabilities and the chamber acoustic resonance. When these vortices dominate the reacting flow, the combustion is confined to their cores, leading to periodic heat release, which may result in the driving of high amplitude pressure oscillations. These oscillations are typical to the occurrence of combustion instabilities for certain operating conditions. The basic understanding of the interaction between flow dynamics and the combustion process opens up the possibility for rational control of combustion-induced pressure oscillations. 42 references.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Naval Weapons Center, China Lake, CA
OSTI Identifier:
6134756
Report Number(s):
AIAA-Paper-87-1326; CONF-870622-
Journal ID: CODEN: AIAJA
Resource Type:
Conference
Journal Name:
AIAA J.; (United States)
Additional Journal Information:
Conference: 19. fluid dynamics, plasma dynamics, and laser conference, Honolulu, HI, USA, 8 Jun 1987
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COMBUSTION CHAMBERS; COMBUSTION INSTABILITY; VORTICES; DIFFUSION; FLAMES; RAMJET ENGINES; ENGINES; HEAT ENGINES; INSTABILITY; INTERNAL COMBUSTION ENGINES; 400800* - Combustion, Pyrolysis, & High-Temperature Chemistry

Citation Formats

Schadow, K C, Gutmark, E, Parr, T P, Parr, D M, and Wilson, K J. Large-scale coherent structures as drivers of combustion instability. United States: N. p., 1987. Web.
Schadow, K C, Gutmark, E, Parr, T P, Parr, D M, & Wilson, K J. Large-scale coherent structures as drivers of combustion instability. United States.
Schadow, K C, Gutmark, E, Parr, T P, Parr, D M, and Wilson, K J. 1987. "Large-scale coherent structures as drivers of combustion instability". United States.
@article{osti_6134756,
title = {Large-scale coherent structures as drivers of combustion instability},
author = {Schadow, K C and Gutmark, E and Parr, T P and Parr, D M and Wilson, K J},
abstractNote = {The role of flow coherent structures as drivers of combustion instabilities in a dump combustor was studied. Results of nonreacting tests in air and water flows as well as combustion experiments in a diffusion flame and dump combustor are discussed to provide insight into the generation process of large-scale structures in the combustor flow and their interaction with the combustion process. It is shown that the flow structures, or vortices, are formed by interaction between the flow instabilities and the chamber acoustic resonance. When these vortices dominate the reacting flow, the combustion is confined to their cores, leading to periodic heat release, which may result in the driving of high amplitude pressure oscillations. These oscillations are typical to the occurrence of combustion instabilities for certain operating conditions. The basic understanding of the interaction between flow dynamics and the combustion process opens up the possibility for rational control of combustion-induced pressure oscillations. 42 references.},
doi = {},
url = {https://www.osti.gov/biblio/6134756}, journal = {AIAA J.; (United States)},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1987},
month = {Mon Jun 01 00:00:00 EDT 1987}
}

Conference:
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