Abstract
The combustion and emission characteristics of surrogate diesel fuel homogeneous charge compression ignition (HCCI) with different combustion boundary conditions and n-butanol (NB) mixing ratios are studied in this work. Engine data of a two-stroke low-speed direct-injection marine diesel engine were selected for the reactor. HCCI combustion was achieved by compressing a completely homogeneous mixture of fuel and air. The results show that NO emissions decrease slightly with the increase of initial boundary pressure at a constant equivalence ratio and initial temperature. In addition, the different initial boundary temperature has little effect on NO emission. The results also indicate that the ignition delay time of the mixed fuel rises with the increase of n-butanol mixing ratio. The emissions and reaction rate of NOx reduce significantly with the increase of n-butanol percentage in surrogate diesel fuel and n-butanol mixing combustion at a constant equivalence ratio and total mole fraction. Meanwhile, CO2 emissions also decrease significantly with the increase of n-butanol mixing ratio.
Highlights
The development of society and the economy is inseparable from energy
The effects of different initial conditions and n-butanol blending ratio on two-stroke diesel engine DX homogeneous charge compression ignition (HCCI) combustion are researched in the study
The simulation results are in good agreement with the experimental values in the hightemperature stage, and there are some differences in the low-temperature stage. This is because the experimental data of fuel ignition delay are obtained from the shock tube experiment, while the simulated ignition delay results come from diesel engine combustion
Summary
The development of society and the economy is inseparable from energy. The demand for energy is increasing constantly in the current society, and the rapid consumption of fossil fuels has caused people to face a serious energy crisis. People develop and explore new renewable and efficient fossil fuel alternative energy sources to deal with the increasingly severe energy problem [1,2,3]. Large amounts of CO2 and thermal NOx are produced when the engine burns fossil fuels. NO and NO2 are the two most important harmful pollutants in thermal NOx produced by combustion [4,5,6]. In order to alleviate the serious environmental damage caused by fossil fuels combustion, various countries have formulated different measures to control the exhaust emissions of diesel engines strictly. The British Parliament passed an amendment in 2019 to achieve a net zero emission target by 2050. The development and utilization of new renewable clean energy is receiving more and more attention
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