Abstract
Hydrogen is largely considered as an attractive additive fuel for hydrocarbons and alcohol-fueled engines. Nevertheless, a complete understanding of the interactions between blended fuel mechanisms under oxidative conditions at low initial temperature is still lacking. This study is devoted to the numerical investigation of the laminar burning velocity of hydrogen–hydrocarbon and hydrogen–alcohol fuels under several compositions. Estimations were compared with experimental data reported in the current literature. Additionally, the effects of hydrogen addition on engine performance, NOX, and other pollutant emissions of the mentioned fuels have been thermodynamically analyzed. From the study, it has been observed that the laminar burning velocity of the fuel mixtures increased with increasing hydrogen fractions and the peak value shifted to richer conditions. Besides, hydrogen fraction was found to increase the adiabatic flame temperatures eventually favoring the NOX formation for all fuel blends except the acetylene–hydrogen–air mixture where hydrogen showed a reverse effect. Besides, hydrogen is also found to improve the engine performances and helps to surge thermal efficiency, improve the combustion rate, and lessen other pollutant emissions such as CO, CO2, and unburned hydrocarbons. The model predicted well and in good agreement with the experimental data reported in the recent literature.
Highlights
Due to the rapid reduction of fossil fuel sources and the alarming air pollution, several clean, reliable, and energy-efficient fuel sources are emerging [1,2]
The results showed that the addition of hydrogen accelerates the oxidation of methanol and reduces CH2 O and NO emissions
The current study focuses on the evaluation of the additivity effects of hydrogen on the laminar burning velocity of methane, ethane, propane, acetylene, methanol, and ethanol
Summary
Due to the rapid reduction of fossil fuel sources and the alarming air pollution, several clean, reliable, and energy-efficient fuel sources are emerging [1,2]. Transporting the gas and its large-scale distribution system represent a major drawback. To tackle these issues and for the convenient use of hydrogen, blending with less reactive fuel has been considered in the last years. The hydrogen addition requires a detailed characterization of the overall reactivity and its effects on pollutants’ production. In this sense, the evaluation of the laminar burning velocity represents an essential step because it is a key combustion parameter representing the reactivity, exothermicity, diffusivity, flame flashback, and blow off trends of the fuel [6]
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