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Mean behaviour of flame displacement speed in boundary layer flashback of hydrogen-rich premixed turbulent combustion

Lookup NU author(s): Dr Umair Ahmed, Professor Nilanjan Chakraborty

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Abstract

© Asia-Pacific Conference on Combustion, ASPACC 2019. All right reserved. A direct numerical simulation (DNS) database for flashback of premixed hydrogen-air flame in a fully developed turbulent channel flow has been utilised to analyse flame propagation statistics at different wall normal distances. The non-reacting part of the channel flow is representative of the friction velocity based Reynolds number = 120 and the hydrogen-air mixture is taken to have an equivalence ratio of 1.5. A skeletal chemical mechanism with 9 chemical species and 20 reactions is employed for an accurate representation of hydrogen-air combustion. The statistics of local displacement speed have been analysed at different distances from the wall. It has been found that the mean density-weighted displacement speed remains similar for all the locations investigated. It is also found that the scatter in the instantaneous values of the density-weighted displacement speed increases towards the center of the channel. Furthermore, it is shown that the mean values for the reaction component , normal diffusion component , and the tangential diffusion component of displacement speed remain qualitatively similar to that reported in the existing literature for freely propagating statistically planar flames. The reaction component has been found to play a major role in determining the behaviour of the density-weighted displacement speed.


Publication metadata

Author(s): Ahmed U, Pillai AL, Chakraborty N, Kurose R

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 12th Asia-Pacific Conference on Combustion (ASPACC 2019)

Year of Conference: 2019

Online publication date: 01/07/2019

Acceptance date: 02/04/2018

Publisher: Combustion Institute

URL: http://www.combustionsociety.jp/aspacc19/


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