Abstract
To improve the combustion and emission characteristics of diesel engines, methanol-diesel fuels with different mixing ratios (DM0, DM10, DM20, DM30, and DM40) were used to investigate the effects of methanol addition on the combustion and emission of a four-stroke diesel engine in terms of cylinder pressure, brake power, brake-specific fuel consumption, and nitrogen oxides, soot, and carbon monoxide emissions. Firstly, an improved entire diesel engine model was developed using AVL-BOOST software and validated by the experimental results. The results showed that the increase of methanol content in the fuel mixture had a negative impact on the performance characteristic of the diesel engine, but significantly improved the emission characteristic of the diesel engine. With the methanol ratio in the mixed fuel increased to 10%, 20%, 30%, and 40%, the cylinder pressure of the engine increased by 0.89%, 1.48%, 2.29%, and 3.17%, respectively. However, the power decreased by 3.76%, 6.74%, 11.35%, and 15.45%, the torque decreased by 3.76%, 6.74%, 11.35%, and 15.45%, respectively, and the brake specific fuel consumption increased by 3.77%, 6.92%, 12.33%, and 17.61%, respectively. In addition, with the methanol ratio in the mixed fuel increased to 10%, 20%, 30%, and 40%, the carbon monoxide emission decreased by 21.32%, 39.04%, 49.81%, and 56.59% and the soot emission decreased by 0.25%, 8.69%, 16.81%, and 25.28%, respectively. Therefore, the addition of methanol to the fuel can improve the combustion and emission characteristics of the engine.
Highlights
Efof different ratiosratios of methanol-diesel mixtures on engine performance and emission characfects of different of methanol-diesel mixtures on engine performance and emission teristics were studied in terms of cylinder pressure, cylinder temperature, brake-specific characteristics were studied in terms of cylinder pressure, cylinder temperature, fuel consumption (BSFC), brake power, brake thermal efficiency (BTE), soot emission, nitric oxide (NO)
The results show that the maximum cylinder pressure for DM10, DM20, DM30, and DM40 mixes is higher than that of pure diesel DM0
The results show that the power and torque12ofofthe engine decrease as the ratio of methanol in the methanol-diesel fuel mixture increases
Summary
Diesel engines are widely used in passenger and cargo transportation and engineering power because of their good economy [1] and reliability [2] They make a significant contribution to industrial development and economic progress. Facing the problem of global environmental degradation and the energy crisis, how to effectively reduce the emissions of diesel engines and how to look for renewable fuels needs to be solved in the development of society. Many researchers found that alcohol fuels and biodiesel played an essential role in alleviating environmental pollution and energy crises. These alternative fuels can reduce our dependence on fossil energy and reduce CO and HC emissions [9]. Mixing methanol with other hydrocarbons can improve combustion efficiency and reduce combustion temperature
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