Direct Numerical Simulation of a partially premixed turbulent, lifted flame

Shahram Karami, Mohsen Talei, Evatt R. Hawkes, Obulesu Chatakonda

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2 Citations (Scopus)

Abstract

The objective of this paper is to investigate the stabilisation mechanism in a partially premixed lifted flame using a three-dimensional Direct Numerical Simulation (DNS) with one step chemistry. A slot jet flame is studied with a Reynolds number of 4500 with ambient uniform temperature at the inlet. In this paper, the flame base is defined as the closest location to the inlet with the maximum reaction rate. The streamwise and transverse temporal evolution of the flame base are extracted to examine the steadiness of the flame base. The flame base is analysed using the Flame Index (FI) approach to determine whether the flame base is a premixed flame or a non-premixed flame. The conditional average of scalar dissipation rate on mixture fraction is studied to address the concept of stabilisation by scalar dissipation concept. In addition, the conditional average of reaction rate and temperature on mixture fraction are used to study the structure of the flame base. It is shown the flame is stabilised mainly due to the presence of a premixed flame at the flame base.

Original languageEnglish
Title of host publicationProceedings of the 9th Asia-Pacific Conference on Combustion, ASPACC 2013
PublisherKorean Society of Combustion
Publication statusPublished - 2013
Externally publishedYes
EventAsia Pacific Conference on Combustion 2013 - Gyeongju, Korea, Republic of (South)
Duration: 19 May 201322 May 2013
Conference number: 9th

Conference

ConferenceAsia Pacific Conference on Combustion 2013
Abbreviated titleASPACC 2013
CountryKorea, Republic of (South)
CityGyeongju
Period19/05/1322/05/13

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