Direct numerical simulation of an auto-ignitive turbulent flame in a stratified dimethyl-ether (DME)/air mixture

Conference · Thu Feb 28 23:00:00 EST 2019

OSTI ID:1784182

Desai, Swapnil S. ^[1]; Sankaran, Ramanan ^[1]; Im, Hong G. ^[2]

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1. ORNL
2. King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia

Direct numerical simulations (DNS) of a turbulent premixed flame in an auto-ignitive dimethyl-ether (DME)/air mixture exhibiting two-staged ignition were conducted at elevated pressure and temperature using a statistically stationary planar configuration. Three sets of conditions with an identical turbulence intensity, but different stratification/turbulence length scales and correlations between temperature (T) and equivalence ratio (f) fields were simulated to study the dynamics of turbulent premixed flame propagation at auto-ignitive conditions. The influence of different stratification length scales and T-f correlations on turbulent flame speed was examined by comparing the flame statistics obtained from 2D simulations against laminar 1D solution. A global analysis of the front propagation speed was carried out for determining the effect of turbulent wrinkling and the role of upstream auto-ignition on the overall burning rate.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1784182
• Country of Publication: United States
• Language: English