0

Full Content is available to subscribers

Subscribe/Learn More  >

Numerical Investigation of Lean Blow Out of a Model Gas Turbine Combustion Chamber Using a Presumed JPDF-Reaction Model by Taking Heat Loss Processes Into Account

[+] Author Affiliations
Frank Wetzel, Peter Habisreuther, Nikolaos Zarzalis

University of Karlsruhe, Karlsruhe, Germany

Paper No. GT2006-90064, pp. 41-49; 9 pages
doi:10.1115/GT2006-90064
From:
  • 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

abstract

Due to their excellent behaviour within the scope of mixing, ignition and burnout, swirl-flames are used within quite a manifold of scientific and industrial applications. The development of a swirl-induced inner recirculation zone, which provides heat and active chemical species to the ignition domain of the flame, plays an important role for stabilisation of these highly turbulent flames. Modern concepts for reducing thermal NOx emissions require high ignition stability even if very lean fuel/air-mixtures are in use. Therefore, there is a great demand for models which are able to predict lean blow out of turbulent, aerodynamically stabilised flames. In contrast to the integral approach of many stability models which mostly are based on global quantities, numerical models offer highest possible flexibility aiming at variation of geometry, operating conditions and further parameters. For solving the convective-diffusive problem, a RANS (Reynolds Averaged Navier Stokes) method based on a finite volume approach is applied, using the standard k-ε turbulence model. A joint-probability-density model with an assumed shape of the probability-density-function (presumed shape JPDF-model) describes the interaction of turbulence and chemical reaction. The latter is based on one single variable, describing the mixing state and one single variable, describing the state of reaction progress. The demand, to apply a chemical reaction mechanism, which is based on one single reaction progress variable, is solved by using the concept of the semi-global 2-domain-1-step chemical kinetics scheme. To predict lean blow out for confined diffusive swirl-flames makes it necessary to take into account the convective and radiative heat loss processes. To consider the influence of heat loss on the chemical reaction, the 2-domain-1-step chemical kinetics scheme had to be extended. The local distribution of heat loss inside the flow field is covered by a variable named “enthalpy-index”, which describes the normalised ratio of the local enthalpy and local enthalpy under adiabatic conditions for a given mixture composition. With this combined model LBO (Lean Blow Out) limits have been deduced for a Methane/Air-flame in a model gas turbine combustor. The results confirm, that lean blow out is predicted at much lower thermal loads if taking heat loss processes into account.

Copyright © 2006 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In