Validation of unsteady flamelet / progress variable methodology for non-premixed turbulent partially premixed flames
conference contributionposted on 19.01.2010 by S.K. Sadasivuni, Weeratunge Malalasekera, Salah Ibrahim
Any type of content contributed to an academic conference, such as papers, presentations, lectures or proceedings.
This paper highlights the modeling capabilities of UFPV approach for the modeling of turbulent partially premixed lifted flames to capture the extinction and re-ignition phenomena. Large eddy simulation (LES) with the probability density function (PDF) approach provides the turbulence-chemistry interaction. All scalars are represented as a function of mean mixture fraction, mixture fraction variance, mean progress variable and scalar dissipation rate. Mixture fraction is assumed to follow a β-PDF distribution. Progress variable and scalar dissipation rate distributions are assumed to be a δ-PDF. Results are compared with experimental data of a vitiated co-flow burner with fuels like CH4/Air and H2/N2. Results of radial plots for temperature, mixture fraction and scattered data of temperature with mixture fraction at various axial locations are compared. Lift-off height for a CH4/Air flame appears to be over-predicted while the predicted lift-off height for a H2/N2 flame shows an under-prediction.
- Mechanical, Electrical and Manufacturing Engineering