Effects of Different Diesel-Ethanol Dual Fuel Ratio on Performance and Emission Characteristics of Diesel Engine

Abstract

In this paper, a four-stroke engine diesel was employed to investigate the effects of different fuel mixture ratios of diesel and ethanol on engine performance and emission characteristics in terms of cylinder temperature, heat release rate, brake power, brake thermal efficiency, brake specific fuel consumption, and cylinder pressure. The corresponding simulation model of diesel engine was developed by AVL-Fire coupled CHEMKIN code, and an improved chemical kinetics mechanism containing 34 reactions and 19 species was employed to simulate the fuel spray process and combustion process. The simulation model was validated by experimental results under 100% and 50% load conditions and used to simulate the combustion process of diesel engine fueled with pure diesel and diesel–ethanol blends with 10%, 20%, and 30% ethanol by volume, respectively. The results showed that the increase of ethanol content in the blended fuel had a certain negative impact on the performance characteristic of diesel engine and significantly improved the emission characteristic of the engine. With the ethanol proportion in the blended fuel increased to 10%, 20%, and 30%, the brake thermal efficiency of the engine increased by 2.24%, 4.33%, and 6.37% respectively. However, the brake-specific fuel consumption increased by 1.56%, 3.49%, and 5.74% and the power decreased by 1.58%, 3.46%, and 5.54% respectively. In addition, with the ethanol proportion in the blended fuel increased to 10%, 20%, and 30%, the carbon monoxide emission decreased by 34.69%, 47.60%, and 56.58%, and the soot emission decreased by 7.83%, 15.24%, and 22.52% respectively. Finally, based on the combining fuzzy and grey correlation theory, nitrogen oxide emission has the highest correlation with engine power and brake-specific fuel consumption. The values reach 0.9103 and 0.8945 respectively. It shows that nitrogen oxide emission and cylinder pressure have a significant relationship on engine power and brake-specific fuel consumption.

Effects of Different Biodiesel-Diesel Blend Fuel on Combustion and Emission Characteristics of a Diesel Engine

“…The results showed that diesel-biodiesel blends could improve the emission characteristics. Based on previous studies, the results obtained showed that biodiesel fuel could decrease PM, CO, HC and NO x emissions [26,27], although, on the other hand some experiments on biodiesel also showed that NO x emission concentration increased [28,29]. Therefore, it is very important to further study the impact of biodiesel on diesel engine emission and combustion characteristics.…”

Optimization Analysis of Locomotive Diesel Engine Intake System Based on Matlab-Simulink and GT-Power

“…The working process of the diesel engine in-cylinder includes complex and integrated processes such as heat transfer, flow, physics, and chemistry. Its basic differential equation is one of the most fundamental equations in simulation calculation [42]. In addition, in diesel engine engineering technology, optimization technology plays a very important role and significance in the process of diesel engine development decision making [43].…”

Effect of Different Technologies on Performance Enhancement of the Micro-Combustor for the Micro Thermophotovoltaic Application: A Review

“…On the contrary, in order to minimize heat loss, lowpower systems will tend to use more insulating materials [199]. It was believed that the heat loss had great influences on extinction and the wall thermal conductivity greatly affects blowout [200]. In addition, Li et al [201] indicated that the increase of the wall thermal conductivity could increase the critical blowout velocity, suggesting the importance of operation of catalytic micro combustors and thermal management in the design.…”