Journal Article10.1007/S10494-014-9554-4
Linear-Eddy Model Formulated Probability Density Function and Scalar Dissipation Rate Models for Premixed Combustion
H. P. Tsui,W. K. Bushe +1 more
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TL;DR: In this article, a tabulated, pseudo-turbulent Probability Density Function (PDF) model for premixed combustion is proposed, which is used to construct the PDFs for a temperature-based progress variable in a turbulent methane/air V-flame produced by the Cambridge slot burner.
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Abstract: A tabulated, pseudo-turbulent Probability Density Function (PDF) model for premixed combustion is proposed. The Linear-Eddy Model (LEM) is used to construct the PDFs for a temperature-based progress variable in a premixed, turbulent methane/air V-flame produced by the Cambridge slot burner. As a second case study, the LEM PDFs are similarly compared to PDFs extracted from Direct Numerical Simulations (DNS) of a turbulent premixed flame. LEM demonstrates the ability to reproduce the salient features from experimental and DNS PDFs; moreover, it is able to better capture turbulent effects than previously suggested laminar flamelet PDF models. The Scalar Dissipation Rate (SDR) for premixed combustion is likewise investigated. The stochastic nature of LEM enables it to mimic the overall behaviors of turbulent reactions inexpensively and qualitatively. Crucially, LEM appears to be well suited for the preprocessing tabulation of PDF and SDR models for a number of premixed combustion simulation strategies.
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Citations
Spatial gradients of conditional averages in turbulent flames
TL;DR: In this article, the authors examined the effects of spatial variations in the conditional averages of reactive scalars in the context of the conditional source-term estimation (CSE) model, with particular emphasis on the double-conditional version, DCSE.
29
A New Analytic pdf for Simulations of Premixed Turbulent Combustion
TL;DR: In this paper, a new reaction rate source term for premixed combustion with a single progress variable c is proposed, which is analytically invertible into a set of parameters called the laminar flame Eigenvalue.
A near-exact analytic solution of progress variable and pdf for single-step Arrhenius chemistry
Michael Pfitzner,Markus Klein +1 more
TL;DR: In this article, a new chemical reaction rate source term in the transport equation of a single progress variable is proposed and implications for premixed flame modelling are discussed, and a method to evaluate the progress variable pdf from DNS data is introduced.
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An analytic probability density function for partially premixed flames with detailed chemistry
Michael Pfitzner,Paola Breda +1 more
TL;DR: In this article, a polynomial fit to cp/lambda as a function of the progress variable is proposed for the laminar flame pdf and the mean value of progress variable and of the reaction source term.
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Large eddy simulation of premixed combustion using flamelets
Ivan Langella
- 02 Feb 2016
TL;DR: In this paper, two models are identified, one based on an algebraic expression for the reaction rate of a progress variable and the assumption of fast chemistry, the other based on a database of unstrained flamelets in which reaction rates are stored and parametrised using a progress variables and its SGS variance, and their potentials are shown for a wide range of premixed combustion conditions of practical interest.
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TL;DR: In this paper, a three-dimensional spatially developing turbulent slot-burner Bunsen flame has been performed with a reduced methane-air mechanism, derived from sequential application of directed relation graph theory, sensitivity analysis and computational singular perturbation over the GRI-1.2 detailed mechanism.
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