Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications

Energy conversion efficiency of a thermo photo voltaic (TPV) system strongly depends on the wall temperature and its uniformity. Therefore, improving heat transfer characteristics of these systems has been a focus of many recent studies. This study explores the effect of curvature on heat transfer,...

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Main Authors: Akhtar, S., Khan, M.N., Kurnia, J.C., Shamim, T.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.19825 /
Published: Elsevier Ltd 2017
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85012301073&doi=10.1016%2fj.apenergy.2017.01.097&partnerID=40&md5=463eb1b55c44ebefd58c593c9a679f51
http://eprints.utp.edu.my/19825/
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spelling utp-eprints.198252018-04-22T12:59:40Z Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications Akhtar, S. Khan, M.N. Kurnia, J.C. Shamim, T. Energy conversion efficiency of a thermo photo voltaic (TPV) system strongly depends on the wall temperature and its uniformity. Therefore, improving heat transfer characteristics of these systems has been a focus of many recent studies. This study explores the effect of curvature on heat transfer, overall energy conversion, flame stability and emission levels for a circular micro-combustor with a sudden expansion (backward facing step). Uniformity index and figure of merit (FoM) have been defined to facilitate the analysis of computational results from a three-dimensional turbulent reaction model for curved micro-combustor. The results indicate an enhancement of 110 K in the outer wall temperature and a 7.84 maximum increase in overall energy conversion efficiency for curved channels relative to the straight channels. The flame structure in curved channels, however, is found to be more susceptible to instability such as flame flashback. The model indicates a maximum increase of about 2.5 m/s in the lower limit of the inlet mixture velocity for safe combustion operation in curved ducts. © 2017 Elsevier Ltd Elsevier Ltd 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85012301073&doi=10.1016%2fj.apenergy.2017.01.097&partnerID=40&md5=463eb1b55c44ebefd58c593c9a679f51 Akhtar, S. and Khan, M.N. and Kurnia, J.C. and Shamim, T. (2017) Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications. Applied Energy, 192 . pp. 134-145. http://eprints.utp.edu.my/19825/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description Energy conversion efficiency of a thermo photo voltaic (TPV) system strongly depends on the wall temperature and its uniformity. Therefore, improving heat transfer characteristics of these systems has been a focus of many recent studies. This study explores the effect of curvature on heat transfer, overall energy conversion, flame stability and emission levels for a circular micro-combustor with a sudden expansion (backward facing step). Uniformity index and figure of merit (FoM) have been defined to facilitate the analysis of computational results from a three-dimensional turbulent reaction model for curved micro-combustor. The results indicate an enhancement of 110 K in the outer wall temperature and a 7.84 maximum increase in overall energy conversion efficiency for curved channels relative to the straight channels. The flame structure in curved channels, however, is found to be more susceptible to instability such as flame flashback. The model indicates a maximum increase of about 2.5 m/s in the lower limit of the inlet mixture velocity for safe combustion operation in curved ducts. © 2017 Elsevier Ltd
format Article
author Akhtar, S.
Khan, M.N.
Kurnia, J.C.
Shamim, T.
spellingShingle Akhtar, S.
Khan, M.N.
Kurnia, J.C.
Shamim, T.
Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications
author_sort Akhtar, S.
title Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications
title_short Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications
title_full Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications
title_fullStr Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications
title_full_unstemmed Investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (TPV) applications
title_sort investigation of energy conversion and flame stability in a curved micro-combustor for thermo-photovoltaic (tpv) applications
publisher Elsevier Ltd
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85012301073&doi=10.1016%2fj.apenergy.2017.01.097&partnerID=40&md5=463eb1b55c44ebefd58c593c9a679f51
http://eprints.utp.edu.my/19825/
_version_ 1741196269988085760
score 11.62408

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