Abstract
In this paper, biodiesel was used as an alternative fuel to investigate the combustion and emission characteristics of a four-stroke diesel engine, in terms of cylinder pressure, heat release rate, cylinder temperature, brake thermal efficiency, brake specific fuel consumption, nitrogen oxide, soot, carbon monoxide, and hydrocarbon. Firstly, a diesel engine cylinder model was developed by AVL-Fire software coupled with CHEMKIN code to simulate the injection and combustion of biodiesel with a kinetic mechanism with 106 species and 263 reactions. Then, the simulation model was validated by experimental results under 100% and 50% load conditions and used to simulate the combustion process of a diesel engine fueled with pure diesel, biodiesel, and biodiesel–diesel blends with 10%, 20%, 30% biodiesel by volume, respectively. The results showed that the brake specific fuel consumption increased with the increase of mixed biodiesel ratio. The brake specific fuel consumptions of B10, B20 and B30 increased by 1.1%, 2.3% and 3.3%, respectively, compared with that of D100. The combustion and emission characteristics of the diesel engine are improved. Therefore, biodiesel can be used as an alternative fuel for the diesel engine. The diesel–biodiesel fuel can improve the combustion and emission characteristics of the diesel engine.
Highlights
Accepted: 4 November 2021Due to the economy and reliability of diesel engines, they have become the primary power source for ships, construction machinery, and heavy trucks [1]
The results showed that the brake thermal efficiency had no obvious change when the engine was fueled with diesel–biodiesel fuel (20% soybean biodiesel by volume) and diesel
Where p is the cylinder pressure, MPa; T is the cylinder temperature, K; Ca is the air velocity coefficient; Cv is the velocity of the cylinder, m/s; Cb is the chamber shape coefficient; P1, T1 and V1 is the cylinder pressure, temperature and volume when the piston move to the beginning of the compression stroke, respectively, Vs is the cylinder work capacity, m3 ; p0 is the cylinder pressure measured by dynamic test branch, MPa
Summary
Due to the economy and reliability of diesel engines, they have become the primary power source for ships, construction machinery, and heavy trucks [1]. Biodiesel is a clean energy source and is considered as the most viable replacement of fossil fuels due to its biodegradable nature [11], low emissions, carbon neutrality, and nontoxicity [12]. Gokalp et al [18] investigated the effects of diesel–biodiesel fuels with different mixing ratios (5%, 20% and 50% biodiesel by volume) on the combustion and performance characteristics of marine diesel engine. Karavalakis et al [19] investigated the effects of diesel–biodiesel fuels on the combustion and performance characteristics of a heavy-duty diesel engine. They found that the diesel–biodiesel fuels could greatly reduce PM, HC, and CO emissions. The findings are of interest in terms of both the prevention of performance losses and emission reduction
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