Abstract
Taking a plateau high-pressure common-rail diesel engine as the research model, a model was established and simulated by AVL FIRE according to the structural parameters of a diesel engine. The combustion and emission characteristics of D, B20, and B50 diesel engines were simulated in the plateau atmospheric environment at 0 m, 1000 m, and 2000 m. The calculation results show that as the altitude increased, the peak in-cylinder pressure and the cumulative heat release of diesel decreased with different blending ratios. When the altitude increased by 1000 m, the cumulative heat release was reduced by about 5%. Furthermore, the emission trend of NO, soot, and CO was to first increase and then decrease. As the altitude increased, the mass fraction of NO emission decreased. As the altitude increased, the mass fractions of soot and CO increased. Additionally, when the altitude was 0 m and 1000 m, the maximum temperature, the mass fraction of OH, and the fuel–air ratio of B20 were higher and more uniform. When the altitude was 2000 m, the maximum temperature, the mass fraction of OH, and the fuel–air ratio of B50 were higher and more uniform. Lastly, as the altitude increased, the maximum combustion temperature of D and B20 decreased, and combustion became more uneven. As the altitude increased, the maximum combustion temperature of B50 increased, and the combustion became more uniform. As the altitude increased, the fuel–air ratio and the mass fractions of OH and NO decreased. When the altitude increased, the soot concentration increased, and the distribution area was larger.
Highlights
With the intensification of air pollution and the energy crisis, the diesel engine represents the main source of energy consumption and air pollution, and the requirements for combustion optimization and emission reduction are gradually increasing [1,2]
The main preparation methods include the chemical synthesis of biodiesel and the biological enzymatic synthesis of biodiesel
Biodiesel refers to the renewable diesel fuel that is made from vegetable oil, animal fat, and recycled catering industry waste fats and oils as raw materials under the action of a catalyst through a cool exchange process that can replace petrochemical diesel [4,5]
Summary
With the intensification of air pollution and the energy crisis, the diesel engine represents the main source of energy consumption and air pollution, and the requirements for combustion optimization and emission reduction are gradually increasing [1,2]. The use of vegetable oil as a substitute fuel oil according to local conditions is a major adjustment of the raw material route It is the major trend in the development of new energy in the world. Zhang Z. et al [11] studied the effects of an Fe2O3-based DOC and SCR catalyst on the combustion and emission characteristics of a diesel engine fueled with biodiesel. Zhang et al [39] studied the effects of oil pressure on a high-altitude diesel engine. The aim was to study the effects of plateau environment on the combustion and emission characteristics of a diesel engine with different blending ratios of biodiesel. The combustion process and emission characteristics of three fuel engines of pure diesel (D), 20% biodiesel (B20), and 50% biodiesel (B50) were simulated and compared at altitudes of 0 m, 1000 m, and 2000 m.
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