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小型直喷柴油机燃用生物柴油的放热规律小型直喷柴油机燃用生物柴油的放热规律

, PP. 93-96

Keywords: 汽车工程,内燃机,生物柴油,燃烧特性

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Abstract:

利用发动机试验台架和燃烧分析仪,测录了燃烧压力随曲轴转角的变化关系,计算并对比分析了发动机燃用生物柴油和柴油时的燃烧放热规律。结果表明与燃用柴油相比,生物柴油的最高燃烧压力和最大压力升高率在低速、小负荷时明显较高;在高速、小负荷时与柴油发动机的基本相同;在大负荷时低于柴油机的水平,对应的曲轴转角略有提前;生物柴油的瞬时燃烧放热率峰值随转速和负荷的变化趋势与最高燃烧压力基本相同,对应的曲轴转角提前2°CA~3°CA;生物柴油的燃烧始点比柴油早1°CA~2°CA,整个燃烧过程有所前移;生物柴油发动机在小负荷时工作粗暴,而在大负荷时工作柔和。

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