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https://hdl.handle.net/2440/88802
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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 Responsibility: | 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 |
Published version: | http://dx.doi.org/10.2514/6.2012-4087 |
Appears in Collections: | Aurora harvest 2 Mechanical Engineering conference papers |
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