The Third Fuel & Combustion Conference of IRAN , 2010-02-21

Title : ( ARRHENIUS LAW MODIFICATION FOR TURBULENT COMBUSTION MODELING )

Authors: mohammad javadi , Mohammad Moghiman , ,

Citation: BibTeX | EndNote

Abstract

In the Arrhenius law, the effects of turbulent fluctuations on rate of reactions are ignored. The model is generally inaccurate for turbulent flames due to highly non-linear Arrhenius chemical kinetics. Currently great deals of the CFD studies make use of the Eddy- Dissipation Model for investigation of turbulent combustion. Although CFD software such as Fluent allows multi-step reaction mechanisms applying the eddy-dissipation model, they will likely produce incorrect solutions. The reason is that multi-step chemical mechanisms are based on Arrhenius rates, which differ for each reaction. In this paper, a turbulent-chemistry interaction model is developed for numerical investigation of turbulent combustion according to Arrhenius law, which can be generalized to a wide range of complexity, from a single global reaction to a detailed reaction mechanism involving perhaps hundreds of species. It is achieved by introducing a correction turbulent factor (based on turbulent viscosity) added to temperature terms in Arrhenius law. Then, the modified Arrhenius law by this way is applied to simulate an air-methane diffusion flame. The results show that the modified Arrhenius model is in better agreement with the probability density distribution function (PDF) results than eddy-dissipation.

Keywords

, Turbulent combustion, rate of reaction, molecular collision, Arrhenius law, viscosity
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@inproceedings{paperid:1015804,
author = {Javadi, Mohammad and Moghiman, Mohammad and , },
title = {ARRHENIUS LAW MODIFICATION FOR TURBULENT COMBUSTION MODELING},
booktitle = {The Third Fuel & Combustion Conference of IRAN},
year = {2010},
location = {تهران, IRAN},
keywords = {Turbulent combustion; rate of reaction; molecular collision; Arrhenius law; viscosity},
}

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%0 Conference Proceedings
%T ARRHENIUS LAW MODIFICATION FOR TURBULENT COMBUSTION MODELING
%A Javadi, Mohammad
%A Moghiman, Mohammad
%A ,
%J The Third Fuel & Combustion Conference of IRAN
%D 2010

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