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Dense core response to forced acoustic fields in oxygen-hydrogen rocket flames

Morii, Youhi and Beinke, Scott and Hardi, Justin and Shimizu, Taro and Kawashima, Hideto and Oschwald, Michael (2020) Dense core response to forced acoustic fields in oxygen-hydrogen rocket flames. Propulsion and Power Research, 9 (3), pp. 197-215. Elsevier. doi: 10.1016/j.jppr.2020.06.001. ISSN 2212-540X.

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Official URL: https://www.sciencedirect.com/science/article/pii/S2212540X20300341?via%3Dihub


Oscillatory combustion representative of thermo-acoustic instability in liquid rockets is simulated by experiment and LES calculation to investigate the flame behavior in detail. In particular, we focus on how the velocity and pressure fluctuations affect the behavior of the dense oxygen jet, or ‘LOx core’. The test case investigated is a high pressure, multi-injector, oxygen-hydrogen combustor with a siren for acoustic excitation. First, the LES calculation is validated by the resonant frequencies and average flame topology. A precise frequency correction is conducted to compare experiment with LES. Then an unforced case, a pressure fluctuation case, and a velocity fluctuation case are investigated. LES can quantitatively reproduce the LOx core shortening and flattening that occurs under transverse velocity excitation as it is observed in the experiments. On the other hand, the core behavior under pressure excitation is almost equal to the unforced case, and little shortening of the core occurs. The LOx core flattening is explained by the pressure drop around an elliptical cylinder using the unsteady Bernoulli equation. Finally, it is shown that the shortening of the LOx core occurs because the flattening enhances combustion by mixing and increase of the flame surface area.

Item URL in elib:https://elib.dlr.de/137767/
Document Type:Article
Title:Dense core response to forced acoustic fields in oxygen-hydrogen rocket flames
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Morii, YouhiJAXA, Research and Development Directorate, Sagamihara, JPUNSPECIFIEDUNSPECIFIED
Beinke, ScottDLR, Institute of Space Propulsion, Lampoldshausen, DUNSPECIFIEDUNSPECIFIED
Hardi, JustinUNSPECIFIEDhttps://orcid.org/0000-0003-3258-5261UNSPECIFIED
Shimizu, TaroJAXA, Research and Development Directorate, Sagamihara, JPUNSPECIFIEDUNSPECIFIED
Kawashima, HidetoJAXA, Research and Development Directorate, Tsukuba, JPUNSPECIFIEDUNSPECIFIED
Oschwald, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-9579-9825UNSPECIFIED
Journal or Publication Title:Propulsion and Power Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 197-215
Keywords:Liquid rocket engine, Combustion instability, Computational fluid dynamics (CFD), Large eddy simulation (LES), Supercritical fluid
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Reusable Space Systems and Propulsion Technology
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion > Rocket Propulsion
Deposited By: Hanke, Michaela
Deposited On:23 Nov 2020 08:27
Last Modified:23 Nov 2020 08:27

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