Numerical analysis of structure, stability and entropy generation in biogas coflow diffusion flames

• Autorzy: Kumar R. Nivethana , Kumaran S. Muthu , Raghavan Vasudevan

Identyfikatory

DOI

10.24425/ame.2021.139648

• Języki publikacji: EN

Abstrakty

EN

Biogas is a gaseous biofuel predominantly composed of methane and carbon-dioxide. Stability of biogas flames strongly depend upon the amount of carbon-dioxide present in biogas, which varies with the source of biomass and reactor. In this paper, a comprehensive study on the stability and flame characteristics of coflow biogas diffusion flames is reported. Numerical simulations are carried out using reactive flow module in OpenFOAM, incorporated with variable thermophysical properties, Fick’s and Soret diffusion, and short chemical kinetics mechanism. Effects of carbon-dioxide content in the biogas, temperatures of the fuel or coflowing air streams (preheated reactant) and hydrogen addition to fuel or air streams are analyzed. Entropy generation in these flames is also predicted. Results show that the flame temperature increases with the degree of preheat of reactants and the flames show better stability with the preheated air stream. Preheating the air contributes to increased flame stability and also to a significant decrease in entropy generation. Hydrogen addition, contributing to the same power rating, is seen to be relatively more effective in increasing the flame stability when added to the fuel stream. Results in terms of flow, temperature, species and entropy fields, are used to describe the stability and flame characteristics.

Słowa kluczowe

EN

biogas; flame stability; entropy generation; coflow air; hydrogen injection; preheated reactant

PL

biogaz; stabilność płomienia; generowanie entropii; wtrysk wodoru

• Wydawca: Komitet Budowy Maszyn PAN
• Czasopismo: Archive of Mechanical Engineering
• Rocznik: 2022
• Tom: LXIX, nr 1
• Strony: 99--128
• Opis fizyczny: Bibliogr. 35 poz., rys., tab.

Twórcy

autor

Kumar R. Nivethana

• Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai – 600036, India

autor

Kumaran S. Muthu

• Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai – 600036, India

autor

Raghavan Vasudevan

• Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai – 600036, India

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).