Low-order modeling of high-altitude relight of jet engine combustors

A physics-based, low-order ignition model is used to assess the ignition performance of a kerosene-fueled gas-turbine combustor under high-altitude relight conditions. The ignition model used in this study is based on the motion of virtual flame particles and their extinction according to a Karlovit...

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Autores principales:	Pedro M de Oliveira, Michael P Sitte, Marco Zedda, Andrea Giusti, Epaminondas Mastorakos
Formato:	article
Lenguaje:	EN
Publicado:	SAGE Publishing 2021
Materias:	Mechanical engineering and machinery TJ1-1570 Motor vehicles. Aeronautics. Astronautics TL1-4050
Acceso en línea:	https://doaj.org/article/030dba7118b944f5b393dd906f602a46
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spelling	oai:doaj.org-article:030dba7118b944f5b393dd906f602a462021-11-25T11:03:20ZLow-order modeling of high-altitude relight of jet engine combustors1756-828510.1177/17568277211021322https://doaj.org/article/030dba7118b944f5b393dd906f602a462021-06-01T00:00:00Zhttps://doi.org/10.1177/17568277211021322https://doaj.org/toc/1756-8285A physics-based, low-order ignition model is used to assess the ignition performance of a kerosene-fueled gas-turbine combustor under high-altitude relight conditions. The ignition model used in this study is based on the motion of virtual flame particles and their extinction according to a Karlovitz number criterion, and a stochastic procedure is used to account for the effects of spray polydispersity on the flame’s extinction behavior. The effects of large droplets arising from poor fuel atomization at sub-idle conditions are then investigated in the context of the model parameters and the combustor’s ignition behavior. For that, a Reynolds-averaged Navier-Stokes simulation of the cold flow in the combustor was performed and used as an input for the ignition model. Ignition was possible with a Sauter mean diameter (SMD) of 50 μm, and was enhanced by increasing the spark volume. Although doubling the spark volume at larger SMDs (75 and 100 μm) resulted in the suppression of short-mode failure events, ignition was not achieved due to a reduction of the effective flammable volume in the combustor. Overall, a lower ignition probability is obtained when using the stochastic procedure for the spray, which is to be expected due to the additional detrimental effects associated with poor spray atomisation and high polydispersity.Pedro M de OliveiraMichael P SitteMarco ZeddaAndrea GiustiEpaminondas MastorakosSAGE PublishingarticleMechanical engineering and machineryTJ1-1570Motor vehicles. Aeronautics. AstronauticsTL1-4050ENInternational Journal of Spray and Combustion Dynamics, Vol 13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mechanical engineering and machinery TJ1-1570 Motor vehicles. Aeronautics. Astronautics TL1-4050
spellingShingle	Mechanical engineering and machinery TJ1-1570 Motor vehicles. Aeronautics. Astronautics TL1-4050 Pedro M de Oliveira Michael P Sitte Marco Zedda Andrea Giusti Epaminondas Mastorakos Low-order modeling of high-altitude relight of jet engine combustors
description	A physics-based, low-order ignition model is used to assess the ignition performance of a kerosene-fueled gas-turbine combustor under high-altitude relight conditions. The ignition model used in this study is based on the motion of virtual flame particles and their extinction according to a Karlovitz number criterion, and a stochastic procedure is used to account for the effects of spray polydispersity on the flame’s extinction behavior. The effects of large droplets arising from poor fuel atomization at sub-idle conditions are then investigated in the context of the model parameters and the combustor’s ignition behavior. For that, a Reynolds-averaged Navier-Stokes simulation of the cold flow in the combustor was performed and used as an input for the ignition model. Ignition was possible with a Sauter mean diameter (SMD) of 50 μm, and was enhanced by increasing the spark volume. Although doubling the spark volume at larger SMDs (75 and 100 μm) resulted in the suppression of short-mode failure events, ignition was not achieved due to a reduction of the effective flammable volume in the combustor. Overall, a lower ignition probability is obtained when using the stochastic procedure for the spray, which is to be expected due to the additional detrimental effects associated with poor spray atomisation and high polydispersity.
format	article
author	Pedro M de Oliveira Michael P Sitte Marco Zedda Andrea Giusti Epaminondas Mastorakos
author_facet	Pedro M de Oliveira Michael P Sitte Marco Zedda Andrea Giusti Epaminondas Mastorakos
author_sort	Pedro M de Oliveira
title	Low-order modeling of high-altitude relight of jet engine combustors
title_short	Low-order modeling of high-altitude relight of jet engine combustors
title_full	Low-order modeling of high-altitude relight of jet engine combustors
title_fullStr	Low-order modeling of high-altitude relight of jet engine combustors
title_full_unstemmed	Low-order modeling of high-altitude relight of jet engine combustors
title_sort	low-order modeling of high-altitude relight of jet engine combustors
publisher	SAGE Publishing
publishDate	2021
url	https://doaj.org/article/030dba7118b944f5b393dd906f602a46
work_keys_str_mv	AT pedromdeoliveira lowordermodelingofhighaltituderelightofjetenginecombustors AT michaelpsitte lowordermodelingofhighaltituderelightofjetenginecombustors AT marcozedda lowordermodelingofhighaltituderelightofjetenginecombustors AT andreagiusti lowordermodelingofhighaltituderelightofjetenginecombustors AT epaminondasmastorakos lowordermodelingofhighaltituderelightofjetenginecombustors
_version_	1718413538265923584

Low-order modeling of high-altitude relight of jet engine combustors

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