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Performance analysis of a rotating detonation combustor based on stagnation pressure measurements

Bach, Eric and Stathopoulos, Panagiotis and Paschereit, Christian Oliver and Bohon, Myles D. (2020) Performance analysis of a rotating detonation combustor based on stagnation pressure measurements. Combustion and Flame, 217, pp. 21-36. Elsevier. doi: 10.1016/j.combustflame.2020.03.017. ISSN 0010-2180.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0010218020301188

Abstract

This study explores the effect of differing inlet and outlet boundary conditions on the operation and performance of a rotating detonation combustor (RDC) over an annulus mass flux range of 50 to 210 and equivalence ratios of 0.7, 1.0, and 1.3. The RDC is equipped with either a uniform outlet restriction or with a set of nozzle guide vanes to simulate turbine integration. Stagnation pressure data from Kiel probes placed in the high-enthalpy exhaust flow are presented for the operational envelope. The RDC’s operation is categorized into different modes distinguished by the number of co- and counter-rotating combustion waves in the annulus. With increasing mass flux, a typical progression proceeding from a pair of counter-rotating waves, to a single detonation wave, and then further to multiple co-rotating waves is observed with wave speeds reaching up to 84% of the CJ velocity. It is shown that a choking condition at the outlet throat correlates with the transition from two counter-rotating waves to a single wave detonation regime. The channel Mach number is then calculated from measured pressure ratios and is shown to agree with area ratio-based estimates. The pressure gain of the RDC is expressed as the stagnation pressure change from the air plenum to the outlet throat, and it is shown that the specific operating mode of the device – in conjunction with the chosen injector and outlet area ratios – can significantly decrease the pressure gain performance in some cases, while not significantly affecting it in others. While no positive pressure gain was achieved in the experiments, the presented experimental data compare well with numerical results of similar boundary conditions and underline the importance of minimizing injector pressure loss while applying outlet restrictions to the combustor. The data also suggest that specific geometric combinations may lead to adverse modes such as longitudinally pulsing combustion, resulting in a reduction in the measured pressure gain relative to numerical results. This observation occurs more often for geometric combinations which are the most promising for exhibiting positive pressure gain, and suppressing these modes will be an important topic to achieving this goal. It is further shown that transition regions exist between modes of one and multiple co-rotating waves, and that wave multiplication may be necessary to unlock further increases in the pressure gain

Item URL in elib:https://elib.dlr.de/139570/
Document Type:Article
Title:Performance analysis of a rotating detonation combustor based on stagnation pressure measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bach, EricChair of Pressure Gain Combustion, Technische Universität BerlinUNSPECIFIED
Stathopoulos, PanagiotisPanagiotis.Stathopoulos (at) dlr.deUNSPECIFIED
Paschereit, Christian OliverChair of Fluid Dynamics, Technische Universität BerlinUNSPECIFIED
Bohon, Myles D.Chair of Pressure Gain Combustion, Technische Universität BerlinUNSPECIFIED
Date:11 April 2020
Journal or Publication Title:Combustion and Flame
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:217
DOI :10.1016/j.combustflame.2020.03.017
Page Range:pp. 21-36
Publisher:Elsevier
ISSN:0010-2180
Status:Published
Keywords:Rotating detonation engine, Pressure gain combustion, Stagnation pressure, Injector design
HGF - Research field:Energy
HGF - Program:Energy Efficiency, Materials and Resources
HGF - Program Themes:Other
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Low-Carbon Industrial Processes (old)
Location: Cottbus
Institutes and Institutions:Institute of Low-Carbon Industrial Processes
Deposited By: Klinkmüller, Maike
Deposited On:04 Jan 2021 11:03
Last Modified:04 Jan 2021 11:03

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