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Direct numerical simulation of H2 effect on autoignition of DME/Air mixture under HCCI engine conditions

Jin, T; Wang, X; Luo, KH; Luo, K; Fan, J; (2017) Direct numerical simulation of H2 effect on autoignition of DME/Air mixture under HCCI engine conditions. In: Proceedings of the 11th Asia-Pacific Conference on Combustion - 2017. Combustion Institute, The University of Sydney: Sydney, Australia. (In press). Green open access

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Abstract

The effects of hydrogen addition on the multistage autoignition of a lean DME/Air mixture under elevated pressure are investigated by direct numerical simulations (DNSs). The results show that hydrogen addition has a negative effect in the DME low temperature ignition, leading to a declined maximum of the heat release rate (HRR) and a retarded ignition timing. The ignition at higher temperature is significantly delayed by hydrogen addition with increase of the maximum of heat release rate. DNS for thermally stratified turbulent ignitions shows an advanced first stage ignition, yet retarded with addition of hydrogen. The mean HRR in the turbulent cases is more spread out over time while its peak is significantly reduced. The mean HRR during the second and third stage ignition overlap in time, and therefore only a single peak is observed for the thermally stratified cases. And the overall pressure rise rate is smoothed. DNS of the ignition characteristics of uncorrelated and negatively correlated thermally- and compositionally- stratified mixtures is also briefly discussed.

Type: Proceedings paper
Title: Direct numerical simulation of H2 effect on autoignition of DME/Air mixture under HCCI engine conditions
Event: 11th Asia-Pacific Conference on Combustion - 2017
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.anz-combustioninstitute.org/ASPACC2017/...
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10053918
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