Turbulent kinetic energy budget for n-dodecane flames at high Karlovitz numbers.

Understanding of the underlying interactions between the premixed flame and the turbulence will enable us to design and develop cleaner and more efficient combustion engines. However, most of the DNS studies available in the literature are restricted to low Karlovitz number and low Lewis number (Le). Therefore, this presentation will be about the statistical behavior of the turbulent kinetic energy (TKE) transport for n-dodecane flames (Le = 4.2) at high Karlovitz numbers (Ka), ranging from 30 to 150, spanning the thin and broken reaction regimes. Direct Numerical Simulation (DNS) with detailed chemical scheme of 53 species and 289 reactions was employed to simulate the turbulent premixed flames. The terms in the TKE transport equation was analyzed and scaling terms proposed for thin reaction zone were examined to assess the suitability for broken reaction zone and also for high Lewis number fuel. Lewis number is found to have effect on several terms, where their statistical behaviors differed from unity Lewis number fuel such as methane.