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Effect of nitrous oxide on laminar burning velocity, hydrodynamic, and diffusive–thermal instability of biogas combustion

Elhawary, Shehab and Saat, Aminuddin and Abdul Wahid, Mazlan and Md. Zain, Mohd. Zarhamdy (2023) Effect of nitrous oxide on laminar burning velocity, hydrodynamic, and diffusive–thermal instability of biogas combustion. Journal of Thermal Analysis and Calorimetry, 148 (8). pp. 3073-3088. ISSN 1388-6150

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Official URL: http://dx.doi.org/10.1007/s10973-022-11408-2

Abstract

Biogas is a potential alternative energy source with low environmental impact. However, the practical applications of biogas are relatively limited due to the existence of CO2 which acts as a dilutant that decreases the calorific value and the burning rate of biogas. Nitrous oxide (N2O) is known to be a powerful oxidizing agent for propulsion applications which can enhance the combustion rate of biogas. In the present paper, the laminar burning velocity (LBV), hydrodynamic instability, and diffusive–thermal instability of biogas/N2O oxide were experimentally studied at different equivalence ratios. The spherical propagating premixed flames for various mixtures of biogas-N2O were determined using the constant volume combustion vessel at 303 K and atmospheric pressure. Two mechanisms were used in CHEMKIN-PRO software in order to estimate the predicted combustion characteristics of biogas/N2O mixtures. The results indicate that the decline in LBVs was prominent in the fuel-rich mixtures than in the fuel-lean mixtures with CO2 dilution. It is found that the influence of curvature on the flame front is weakened at the fuel lean-to-stoichiometric mixture due to the decrease in the flame thickness; therefore, flame instability tends to increase at the lean-to-stoichiometric region. Thermal diffusivity values decline with increasing the CO2% except in the equivalence ratios of φ = 1.0 and φ = 1.4, which showed no impact on the thermal diffusivity. The thermal reaction of N2O decomposition is the most significant reaction in biogas/N2O combustion at lean mixtures of φ = 0.6 and 0.8.

Item Type:Article
Uncontrolled Keywords:alternative fuels, biogas, diffusive, hydrodynamic instability, laminar burning velocity, nitrous oxide, thermal instabilities
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:104848
Deposited By: Yanti Mohd Shah
Deposited On:25 Mar 2024 09:00
Last Modified:30 Jun 2024 06:40

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