化油器发动机燃用不同比例乙醇汽油的性能和排放试验

在现有的化油器式汽油机结构不做变动和调整的情况下,研究了4种比例的乙醇汽油对发动机动力性、经济性和排放性的影响。研究表明:汽油机使用乙醇汽油,随燃料中乙醇添加比例的增加,过量空气系数逐渐增大;发动机的最大功率有所降低;燃料消耗率逐渐增加,能量消耗率变化不大;CO排放在中低负荷没有明显变化,在高负荷逐渐减少;HC排放逐渐减少;NOx排放在中低负荷逐渐减少,在高负荷逐渐增加。

Performance and exhaust emissions of carburetor engine fueled with different ethanol-gasoline blends

Without modification and adjustment of a carburetor engine, four ethanol-gasoline blends with different ethanol contents were studied for engine power performance, fuel economy and emission behavior. The results show that the engine power output decreases a little as the proportion of ethanol increases, because the excess air ratio is gradually increased. The brake specific energy consumption is equivalent while the brake specific fuel consumption gradually increases. Judged by the engine emission behavior, CO emission gradually decreases at the high load, but is equivalent at the mid-low load; HC emission gradually decreases; and NO_x emission gradually increases at the high load while decreases at the mid-low load.