Numerical Investigation of Turbulent Mixing for Autoignition in Stratified Mixture and Temperature Inhomogeneity Relevant to HCCI Combustion.

Soma Chakraborty, Dipal Patel

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Abstract

A Direct Numerical Simulation (DNS) have been performed for different values of turbulent intensity to study the turbulent mixing time scale.DNS data has been analysed for autoignition for both stratified mixture (methane/air binary mixture)and temperatureinhomogeneity (using temperature fluctuation and Taylor micro-scale of temperature variation) under highly turbulent environments in order to understand the effects of turbulent mixing time on overall combustion. It has been found that higher number of ignition sites are present in the case with higher value of turbulent intensity. Furthermore detrimental effectsof turbulence on flame kernel development and burned gas mass has been observed. The DNS findings show that temperature variation is not decaying over time, but rather increasing with time, suggesting turbulentmixing remains progressive during combustionand plays pivotal role in autoignition combustion. DNS results indicates that the turbulentmixing time decays after successful combustion and is settles into of its initial value.
Original languageEnglish
Pages (from-to)16-22
Number of pages7
JournalInternational Journal of Emerging Technology and Advanced Engineering
Volume9
Issue number12
Publication statusPublished - 1 Dec 2019
Externally publishedYes

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