【摘要】 为探明电热塞温度对甲醇发动机性能的影响，在一台压燃式甲醇发动机上，保持发动机转速不变，研究了不同负荷工况下电热塞温度对M100甲醇发动机燃烧及排放性能的影响规律。结果表明：随着电热塞温度升高，缸压及放热率峰值逐渐增大、燃烧始点前移、压力升高率上升、油耗降低、有效热效率升高。但在不同负荷工况下电热塞温度变化对燃烧及油耗的改善效果不同，20%负荷下效果最佳，随负荷增加，改善效果逐渐减弱。排放特性方面，随电热塞温度升高，NMHC排放减少，NO_x排放逐渐增多；在20%和50%负荷时CO和Soot排放呈下降趋势，最大降幅分别为22.92%和70%,80%负荷时略有增多；未燃甲醇及甲醛等非常规排放物均呈下降趋势，最大降幅分别可达47.64%和32.87%。更多还原

【Abstract】 In order to find out the influences of glow plug temperature on the performance of methanol engine, the influences of glow plug temperature on the combustion and emission performance of M100 methanol engine under different load conditions were studied on a compression ignition methanol engine with engine speed unchanged. The results show that the peak value of cylinder pressure and heat release rate gradually increases with the increase of glow plug temperature, the combustion starting point moves forward, the pressure rise rate increases, the fuel consumption decreases, and the effective thermal efficiency increases. However, the improvement effects of glow plug temperature change on combustion and fuel consumption were different under different load conditions. The improvement effect reaches the optimal at 20% load and gradually decreases with the increase of load. In terms of emission characteristics, NMHC emission reduces and NO_x emission gradually increases with the increase of glow plug temperature. CO and Soot emissions show a downward trend at 20% and 50% load with the maximum reduction of 22.92% and 70% respectively, and slightly increases at 80% load; Unconventional emissions such as unburned methanol and formaldehyde show a downward trend with the maximum reduction of 47.64% and 32.87% respectively.更多还原