Transported PDF Modelling of a High Velocity Bluff-Body Stabilised Flame (HM2) Using Detailed Chemistry

Autor: Tek Seang Kuan, Konstantinos Gkagkas, R. Peter Lindstedt
Rok vydání: 2008
Předmět:
Zdroj: Flow, Turbulence and Combustion. 82:493-509
ISSN: 1573-1987
1386-6184
DOI: 10.1007/s10494-008-9164-0
Popis: A transported probability density function (PDF) approach closed at the joint scalar level was used to model a bluff body stabilised turbulent diffusion flame (HM2) investigated experimentally by Masri and co-workers. The current effort extends a previous study of HM1 (Re = 15,800) to a flame with a higher degree of local extinction (Re = 23,900). The impact of an algebraic model that accounts for local Damkohler number effects on the time-scale ratio of scalar to mechanical turbulence is also evaluated along with the impact of improved thermochemistry. The computations have been performed using a hybrid Monte Carlo/finite volume algorithm and a systematically reduced H/C/N/O mechanism featuring 300 reactions, 20 solved and 28 steady-state species. The joint scalar PDF equations were solved using moving particles in a Lagrangian framework and the velocity field was closed at the second moment level. The redistribution terms were modelled using the Generalized Langevin model of Haworth and Pope. Results show that scalar fields are reproduced with encouraging accuracy and that the revised time scale model improves agreement with experimental data. A high sensitivity to the NO chemistry was observed and encouraging agreement was obtained for the first two moments following adoption of updated reaction rates proposed in an earlier study.
Databáze: OpenAIRE
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