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An empirical model for stagnation pressure gain in rotating detonation combustors

Bach, Eric and Paschereit, Christian Oliver and Stathopoulos, Panagiotis and Bohon, Myles D. (2020) An empirical model for stagnation pressure gain in rotating detonation combustors. Proceedings of the Combustion Institute. Elsevier. doi: 10.1016/j.proci.2020.07.071. ISSN 1540-7489. (In Press)

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Abstract

This work investigates the stagnation pressure gain in rotating detonation combustors (RDC) and its dependency on the geometry and mass flux of the combustor. Using a Kiel probe to directly measure stagnation pressure in the high-enthalpy exhaust stream, results are presented for a systematic variation of these parameters. The best-performing configuration achieved a pressure gain of -8%. A comparison with thrust-based equivalent available pressure data from literature shows that the Kiel probe measurements are in good agreement. It is observed that pressure gain increases with increasing air injector area, decreasing outlet throat area, increasing combustor mass flux, and is seen to be dependent on the operating mode. The data are then used to obtain an empirical model that describes pressure gain as a function of the three variables of injector area ratio, outlet area ratio, and combustor mass flux. The model is compared with measurements in this combustor and others, and is used to predict the pressure gain boundaries and to assess design corridors that potentially achieve positive pressure gain.

Item URL in elib:https://elib.dlr.de/139561/
Document Type:Article
Title:An empirical model for stagnation pressure gain in rotating detonation combustors
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bach, EricChair of Pressure Gain Combustion, Technische Universität BerlinUNSPECIFIED
Paschereit, Christian OliverChair of Fluid Dynamics, Technische Universität BerlinUNSPECIFIED
Stathopoulos, PanagiotisPanagiotis.Stathopoulos (at) dlr.deUNSPECIFIED
Bohon, Myles D.Chair of Pressure Gain Combustion, Technische Universität BerlinUNSPECIFIED
Date:20 September 2020
Journal or Publication Title:Proceedings of the Combustion Institute
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.proci.2020.07.071
Publisher:Elsevier
ISSN:1540-7489
Status:In Press
Keywords:Rotating detonation engine, Pressure gain combustion, Equivalent available pressure, Stagnation pressure measurement, Combustor 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 10:59
Last Modified:04 Jan 2021 10:59

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