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Type: Conference paper
Title: Coupling behaviour of LOx/H₂ flames to longitudinal and transverse acoustic instabilities
Other Titles: Coupling behaviour of LOx/H(2) flames to longitudinal and transverse acoustic instabilities
Author: Hardi, J.S.
Beinke, S.K.
Oschwald, M.
Dally, B.B.
Citation: 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2012, 2012, pp.1-18
Publisher: Aerospace Research Central
Issue Date: 2012
ISBN: 9781600869358
Conference Name: 48th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit (30 Jul 2012 - 1 Aug 2012 : Atlanta, Georgia)
Statement of
Justin S. Hardi, Scott K. Beinke, Michael Oschwald, and Bassam B. Dally
Abstract: A rectangular combustor with acoustic forcing was used to study flame-acoustic interaction under injection conditions which are representative of industrial rocket engines. Hot-fire tests using liquid oxygen and gaseous hydrogen were conducted at pressures of 40 and 60 bar, which are sub- and supercritical conditions respectively for oxygen. To our knowledge, acoustic forcing has never before been conducted at pressures this high in an oxygen-hydrogen system. Examined samples of hydroxyl-radical emission imaging, collected using a high-speed camera during periods of forced acoustic resonance, show significant response in the multi-injection element flame. Transverse acoustic velocity causes shortening of the flame, concentrating heat release near the injection plane. Fluctuating acoustic pressure causes in-phase fluctuation of the emission intensity. Based on these observations, a theorized flame-acoustic coupling mechanism is offered as an explanation for how naturally occurring high frequency combustion instabilities are sustained in real rocket engines. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
Description: Document ID AIAA 2012-4087
Rights: Copyright © 2012 by the American Institute of Aeronautics and Astronautics, Inc
DOI: 10.2514/6.2012-4087
Appears in Collections:Aurora harvest 2
Mechanical Engineering conference papers

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