柴油/乙醇混合燃料的性质及其对发动机性能的影响

研究了不同掺混比例的柴油/乙醇混合燃料的主要理化特性,并结合发动机台架实验考察该混合燃料对发动机性能的影响.实验结果表明,随着乙醇掺混比例的增加,混合燃料的低热值、十六烷值、粘度逐渐降低;混合燃料的低温蒸馏特性较强;助溶剂可有效解决乙醇柴油的相溶问题.发动机实验结果表明,随着乙醇掺混比例的增加,发动机动力性呈现下降趋势;CO、碳烟排放逐渐改善,NOx、HC排放逐渐恶化;燃料的能量消耗率在外特性和负荷特性高负荷工况下逐渐改善,在中小负荷工况恶化.

Study on the Characteristics of Ethanol-Diesel Blend Fuel and the Effects on Diesel Engine

The investigation was made on the main physical and chemical characteristics of ethanol-diesel blend fuel, and the effects on the characteristics of diesel engine were also investigated experimentally. The result shows that the low heat value, cetane number, viscosity of the blends decrease with the increasing content of ethanol in the blends. The distillation characteristic of the blends is high at low temperature. Solvent can better the solubility of ethanol-diesel blend fuel. With the increasing content of ethanol in the blends fuel, the torque output decreases slightly. The emissions of CO and soot are improved and the emissions of HC and NOx are increased. The fuel economy is improved at the high and full load condition and deteriorates at the low load.