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Research on Mechanisms of Exciting Pressure Oscillations in Ramjet Engines

Culick, F. E. C. and Marble, Frank E. and Zukoski, E. E. (1985) Research on Mechanisms of Exciting Pressure Oscillations in Ramjet Engines. In: 1985 AFOSR/ONR Contractors Meeting on Turbulent Combustion 23-35 July 1985. California Institute of Technology , Pasadena, CA, pp. 20-23. http://resolver.caltech.edu/CaltechAUTHORS:20141114-143821228

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Abstract

An analytical and experimental study is being made of the role of combustion in large vortical structures in the mechanism of unsteady and unstable burning in air-breathing engines. A large body of experimental evidence supports the contention that these periodic fluctuations are themselves generated by the nonsteady flow over the flame holders and other surfaces. The mechanism itself is relatively independent of the acoustic configuration of the powerplant and its installation and hence constitutes the fundamental element of the combustion instability process. Whether or not the mechanism is excited does, however, depend upon the detailed acoustic properties of the combustion chamber and its environment and in many circumstances it is apparent that non-linear acoustics plays an essential role. As a consequence, the program includes detailed analytical studies of linear and non-linear acoustics in combustion configurations as a means of coupling the instability mechanism to a particular environment. The effective separation of the instability process into i) its mechanism and ii) its environment is aimed at eventually providing means of rational scaling of laboratory size experiments.


Item Type:Book Section
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http://resolver.caltech.edu/CaltechAUTHORS:20141114-142533608Related ItemBook
Additional Information:AFOSR Grant Number: AFOSR-84-0286
Group:GALCIT
Funders:
Funding AgencyGrant Number
Air Force of Scientific Research (AFOSR)AFOSR-84-0286
Record Number:CaltechAUTHORS:20141114-143821228
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141114-143821228
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51800
Collection:CaltechAUTHORS
Deposited By: Kristin Buxton
Deposited On:15 Nov 2014 00:58
Last Modified:22 Sep 2016 21:52

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