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Transported Scalar PDF Modeling of a Turbulent, Premixed Methane/Air Bunsen-Type Flame

[+] Author Affiliations
Dirk A. Großschmidt, Peter Habisreuther, Henning Bockhorn

University of Karlsruhe, Karlsruhe, Germany

Paper No. GT2006-90257, pp. 201-209; 9 pages
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 1: Combustion and Fuels, Education
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4236-3 | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME


Gas turbine related combustion systems often operate under conditions, where the turbulent time scales of the flow field and the chemical reaction times are of the same order of magnitude. To describe this regime of moderate and small Damköhler numbers, pdf-methods have become an established modeling technique with a thoroughly derived mathematical basis. In this paper a hybrid pdf/FANS method is presented. It is based on the transported pdf equation closed at the joint composition level, which is implemented into a commercial 3D CFD solver. The solution algorithm features a stochastic particle system in a Lagrangian framework. The test case under consideration is a H2 -stabilized turbulent premixed methane/air flame with co-flow. The set up was investigated using optical and conventional measurement techniques. Field measurements of velocity and composition were compared against calculations with the hybrid approach. The thermo-chemistry was described by a two domain-one step kinetic scheme. This semi-global kinetics was derived for use with CFD simulations of technical applications in the context of gas turbine combustion. For the numerical calculations the mean estimates are extracted from the stochastic particle field, which contains the complete one point statistics of the species composition vector. The knowledge of the composition pdf allows an evaluation of the structure of the turbulent reaction zone at any position of the flame.

Copyright © 2006 by ASME



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