Abstract
In this paper, the effects of different diesel–methanol blends on the combustion and emission characteristics of diesel engines are investigated in terms of cylinder pressure, heat release rate, cylinder temperature, brake specific fuel consumption, thermal brake efficiency, brake power, and soot, nitrogen oxides, and carbon monoxide emissions in a four-stroke diesel engine. The corresponding three-dimensional Computational Fluid Dynamics (CFD) model was established using the Anstalt für Verbrennungskraftmaschinen List (AVL)-Fire coupled Chemkin program, and the chemical kinetic mechanism, including 135 reactions and 77 species, was established. The simulation model was verified by the experiment at 50% and 100% loads, and the combustion processes of pure diesel (D100) and diesel–methanol (D90M10, D80M20, and D70M30) were investigated, respectively. The results showed that the increase in methanol content in the blended fuel significantly improved the emission and power characteristics of the diesel engine. More specifically, at full load, the cylinder pressures increased by 0.78%, 1.21%, and 1.41% when the proportions of methanol in the blended fuel were 10%, 20%, and 30%, respectively. In addition, the power decreased by 2.76%, 5.04%, and 8.08%, respectively. When the proportion of methanol in the blended fuel was 10%, 20%, and 30%, the soot emissions were decreased by 16.45%, 29.35%, and 43.05%, respectively. Therefore, methanol content in blended fuel improves the combustion and emission characteristics of the engine.
Highlights
Due to the durability, reliability, and high efficiency of diesel engines [1], they are widely used in industry, the military, transportation, and other fields [2]
Liu et al [23] have studied he combustion and emission characteristics of diesel engine fueled with different biodiesel blends
This paper selected the K-ε model most commonly used in Computational Fluid Dynamics (CFD) calculation in Anstalt für Verbrennungskraftmaschinen List (AVL)-Fire software based on the three conservations of mass, momentum, and energy to solve the average transport equation
Summary
Reliability, and high efficiency of diesel engines [1], they are widely used in industry, the military, transportation, and other fields [2]. Liu et al [23] have studied he combustion and emission characteristics of diesel engine fueled with different biodiesel blends They found that the fuel-rich region and the maximum in-cylinder temperature of the dual-fuel engines were significantly lower, leading to a simultaneous reduction in NOx and PM emissions. Luo et al [24] established a three-dimensional CFD model of the engine using AVL-Fire software and studied the impact of the fuel injection strategy on engine combustion and emission characteristics. The results showed that a suitable injection strategy could improve in-cylinder combustion and reduce NOx and soot emissions. The diesel engine simulation model was established by AVL-Fire combined with a Chemkin code and employed to investigate the effects of diesel–methanol blended fuel with different mixing ratios on diesel engines’ combustion and emission characteristics. The research is of interest due to both emission reduction and prevention of performance losses
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