燃用天然气合成油增压柴油机特性研究

STUDY ON CHARACTERISTICS OF A TURBOCHARGED DIESEL ENGINE FUELED WITH GAS-TO-LIQUIDS FUEL

在一台增压中冷柴油机上分别燃用常规柴油与代用燃料天然气合成油(GTL),供油提前角分别设为上止点前9°和12°CA,对比研究了燃用这两种燃料的柴油机动力性、经济性、燃烧和排放特性。与柴油相比,燃用GTL的柴油机有效功率和转矩不变,有效燃油油耗率降低,有效热效率相当;GTL的最高燃烧压力和放热率峰值均略低,GTL的着火时刻、缸压和放热率峰值出现时刻均略晚,燃烧持续期略长;与柴油相比,在试验工况下GTL平均降低了16.6%HC、14.5%CO、15.7%碳烟和15.1%NO_x排放。试验结果显示GTL是一种有潜力的低排放代用燃料。

Power performance, economy performance, combustion and emission characteristics of a turbocharged diesel engine, fueled with Gas-to-Liquids（GTL） fuel, were investigated and compared with those of the engine operating conventional diesel fuel, with 9° and 12° CA BTDC fuel supply advance angles separately. Compared to the diesel fuel, GTL exhibited the same power and torque output, lower brake specific fuel consumption, equivalent effective thermal efficiency; and lower peak values of cylinder pressure and heat release rate; later ignition beginning, retarding maximum cylinder pressure and maximum heat release rate, and longer combustion duration. On average, GTL reduced HC, CO, smoke and NOx by 16.6%, 14.5%, 15.7% and 15.1%, respectively, compared to diesel fuel. GTL is a promising alternative fuel for low emissions.