Study on the formation process of the in-cylinder soot of a diesel engine fueled with diesel-biodiesel blends at different altitudes
Biodiesel is a typical"green energy".As it contains oxygen, it helps to alleviate the deteriorated combustion and aggravated emissions of the diesel engine fueling with biodiesel in the hypoxic environment of the plateau areas.However, there are relatively few reports on the generation and oxidation of the in-cylinder soot of the diesel engine fueled with biodiesel-diesel blends at different altitudes.Based on the experimental data of a certain agricultural diesel engine fueled with biodiesel-diesel blends at different altitudes, this paper builds a three-dimensional numerical model of the in-cylinder combustion of the diesel engine fueled with biodiesel-diesel blends.On the basis of verifying the accuracy of the three- dimensional numerical model, the model is employed to study the generation and oxidation process of the in-cylinder soot of the diesel engine fueled with different proportions of biodiesel-diesel blends at different altitudes.Our results show when different proportions of biodiesel-diesel mixed fuel are used for diesel engines, with the increase of altitude, the starting point and the corresponding time of the peak value of soot generation are postponed, and the peak value of soot and its stabilized final value are increased, and the range corresponding to the soot from the beginning of generation to the stabilization is extended.With the increase of the proportion of biodiesel used in diesel engines, obvious change rules are not recorded at the starting point of soot generation, and the soot generation rate, the peak value in the cylinder and the stabilized final value all decrease, and the corresponding interval from the beginning of soot generation to the stabilization is shortened.Our study may provide some references for the clean and efficient combustion of biodiesel for diesel engines working at high-altitude areas.
国家科技期刊平台
NSTL
万方数据
