• формат pdf
  • размер 12.19 МБ
  • добавлен 11 сентября 2011 г.
Hermann M. Numerical Simulation of Premixed Turbulent Combustion Based on a Level Set Flamelet Model
Shaker Verlag, 2001. 155 p. ISBN:3-8265-9362-6

Turbulent premixed combustion occurs in a wide variety of technical applications. To achieve a profound understanding of the relevant physical and chemical processes involved and to enhance the predictability of these processes, a level set flamelet model for premixed turbulent combustion is presented in this work. As a turbulent combustion model is ultimately aimed at the design process, numerical simulations should give results in relatively fast tuover times without sacrificing physical accuracy. An initial analysis shows that the technically relevant turbulent premixed combustion processes occur almost exclusively within the so-called corrugated flamelets and thin reaction zone regime. In these regimes, the relevant chemical time and length scales arc smaller than the respective turbulent time and length scales. This implies that the important chemical reactions take place in thin, locally one-dimensional laminar layers, the so-called flamelets, embedded in an otherwise inert turbulent flow field. Hence, assuming scale separation of chemical and turbulent scales, the calculation of the chemistry can be decoupled from the calculation of the turbulent flow field. In practice, the chemical structure of the instantaneous premixed flames is solved in a pre-processing step and then stored in so-called flamelet libraries. Since the chemical time and length scales need no longer be resolved in the subsequent turbulent combustion simulation, the numerical effort is greatly reduced, thus allowing for the calculation of complex reacting flows, even within the scope of an engineering framework. The effect of combustion on the turbulent flow field is then accounted for by reattaching an ensemble average of the previously calculated flamelet s to the mean flame front location with the help of a presumed shape probability density function approach. The position of the propagating mean flame front in the turbulent flow field is defined by a level set iso-scalar surface whose motion is described by the mean level set transport equation. This implies that the turbulent buing velocity is a well defined quantity. It can be calculated from cither an algebraic equation directly or via the solution of the differential equation for the flame surface area ratio.
Похожие разделы
Смотрите также

Demiraydin L. Numerical Investigation of Turbulent Nonpremixed Methane-air Flames

  • формат pdf
  • размер 7.43 МБ
  • добавлен 11 сентября 2011 г.
Zurich, 2002. 161 p. Turbulent combustion is an important phenomenon in industrial applications, such as gas turbines, diesel engines, low NOx burners, spark-ignition engines and furnaces. Improvements are often necessary, since the applications have to be effective, economical and clean. Therefore, a better understanding of the turbulent combustion is needed. Numerical simulations, so-called Computational Fluid Dynamics (CFD), help to optimiz...

Peters N. Turbulent Combustion

  • формат pdf
  • размер 12.87 МБ
  • добавлен 17 июня 2011 г.
Cambridge University Press, 2000 p. 304 p. ISBN:0521660823 The combustion of fossil fuels remains a key technology for the foreseeable future. It is therefore important to understand combustion mechanisms, in particular, the role of turbulence within this process. This monograph presents a thorough introduction to the field of turbulent combustion. After an overview of modeling approaches, Peters considers the three distinct cases of premixed,...

Review articles on the study of combustion. Combustion Theory and Modelling. Volumes Part 3 1-13 [1997-2009]

  • формат pdf
  • размер 67.75 МБ
  • добавлен 24 августа 2011 г.
Taylor & Francis, 1999. 810 p. ISSN:1364-7830 Combustion Theory and Modelling is devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Experimental studies that are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory. Articles can cover a...

Review articles on the study of combustion. Combustion Theory and Modelling. Volumes Part 4 1-13 [1997-2009]

  • формат pdf
  • размер 35.08 МБ
  • добавлен 24 августа 2011 г.
Taylor & Francis, 2000. 593 p. ISSN:1364-7830 Combustion Theory and Modelling is devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Experimental studies that are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory. Articles can cover a...

Review articles on the study of combustion. Combustion Theory and Modelling. Volumes Part 5 1-13 [1997-2009]

  • формат pdf
  • размер 16.49 МБ
  • добавлен 24 августа 2011 г.
Taylor & Francis, 2001. 746 p. ISSN:1364-7830 Combustion Theory and Modelling is devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Experimental studies that are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory. Articles can cover a...

Review articles on the study of combustion. Combustion Theory and Modelling. Volumes Part 6 1-13 [1997-2009]

  • формат pdf
  • размер 14.28 МБ
  • добавлен 24 августа 2011 г.
Taylor & Francis, 2002. 728 p. ISSN:1364-7830 Combustion Theory and Modelling is devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Experimental studies that are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory. Articles can cover a...

Review articles on the study of combustion. Combustion Theory and Modelling. Volumes Part 7 1-13 [1997-2009]

  • формат pdf
  • размер 23.97 МБ
  • добавлен 24 августа 2011 г.
Taylor & Francis, 2003. 818 p. ISSN:1364-7830 Combustion Theory and Modelling is devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Experimental studies that are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory. Articles can cover a...

Review articles on the study of combustion. Combustion Theory and Modelling. Volumes Part 8 1-13 [1997-2009]

  • формат pdf
  • размер 24.08 МБ
  • добавлен 24 августа 2011 г.
Taylor & Francis, 2004. 842 p. ISSN:1364-7830 Combustion Theory and Modelling is devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Experimental studies that are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory. Articles can cover a...

Review articles on the study of combustion. Combustion Theory and Modelling. Volumes Part 9 1-13 [1997-2009]

  • формат pdf
  • размер 15.66 МБ
  • добавлен 24 августа 2011 г.
Taylor & Francis, 2005. 757 p. ISSN:1364-7830 Combustion Theory and Modelling is devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Experimental studies that are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory. Articles can cover a...

Swaminathan N., Bray K.N.C. (eds.) Turbulent Premixed Flames

  • формат pdf
  • размер 8.03 МБ
  • добавлен 10 октября 2011 г.
Cambridge University Press, 2011. 438 p. ISBN:0521769612. A work on turbulent premixed combustion is timely because of increased concern about the environmental impact of combustion and the search for new combustion concepts and technologies. An improved understanding of lean fuel turbulent premixed flames must play a central role in the fundamental science of these new concepts. Lean premixed flames have the potential to offer ultra-low emissi...