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Analysis of ignition processes at combustors for aero engines at high altitude conditions with and without effusion cooling

Martinos, Alexios-Dionysios; Zarzalis, Nikolaos; Harth, Stephan-Raphael

Abstract:
The ability to re-ignite at high altitude after a flameout event is critical for flight safety. One reason that makes the relight process of the engine difficult is the low temperature and pressure, which leads to poor atomization, low degree of evaporation and slow reaction rate of the vaporized fuel. For this research work a rectangular, one sector RQL combustion chamber was utilized for experimental investigations at high altitude conditions. The design of the chamber is modular so that experiments for two configurations, i.e. without and with effusion cooling holes can be conducted. The fuel injection and the ignition system are representative of the ones used in commercial aviation.

The investigations were performed in the frame of the European research project SOPRANO at the ISCAR rig. The ISCAR rig is capable of generating low pressure and temperature conditions for flowing kerosene-air mixtures.

The investigation focuses on the characterization of the ignition process, in terms of probability, minimum fuel to air ratio (FAR) and ignition timing for a successful ignition event. In addition, the unsteady flame kernel generation and propagation were analyzed by high-speed imaging recording.
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Verlagsausgabe §
DOI: 10.5445/IR/1000130046
Veröffentlicht am 26.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 11.01.2021
Sprache Englisch
Identifikator ISBN: 978-0-7918-8405-8
KITopen-ID: 1000130046
Erschienen in Proceedings of ASME Turbo Expo 2020, Turbomachinery Technical Conference and Exposition, GT2020, September 21-25, 2020, Virtual, Online
Veranstaltung ASME Turbo Expo: Turbomachinery Technical Conference and Exposition (2020), Online, 21.09.2020 – 25.09.2020
Verlag The American Society of Mechanical Engineers (ASME)
Seiten GT2020-16173
Schlagwörter Aircraft engines, Combustion chambers, Cooling, Ignition, Fuels, Pressure, Flames, Temperature, Commercial air transport, Design, Engines, Evaporation, Flight, Ignition systems, Image processing, Imaging, Low temperature, Nozzles, Pressure drop, Probability, Safety
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