| 摘要:在试验校准的基于GT-POWER的平原环境柴油机工作过程模型基础上,模拟大气环境对增压柴油机输出性能和燃烧特性的影响。计算结果表明:海拔高度从0~4000 m,在外特性工况下,柴油机功率最大下降14%,油耗增加近10%,排气温度最大升高100 ℃,后燃严重；4000 m海拔和0 m相比,缸内燃烧放热率重心最大拖后7℃A,瞬时放热率峰值最大降低0.009 KJ/℃A,缸内最高燃烧压力降低1.6 MPa,缸内平均温度峰值增加220 ℃以上；1400 r/min,100%负荷时,缸内最高燃烧压力最大,缸内平均温度最高,随转速增大,放热速率减慢；随负荷增加,放热速率增大,燃烧始点略有提前。研究为柴油机高原功率恢复和性能改进提供了参考。 |
| 关键词: 增压柴油机 大气压力 燃烧特性 |
|
| Combustion Characteristics of Turbocharged Diesel in Different Atmosphere Environment |
| Guo Mengchao,Wang Xiancheng,Chang Qiang |
| Department of Mechanical Engineering, Academy of The Armored Force Engineering Beijing 100072;Department of Automobile Command, Academy of Military Transportation Tianjin 300161 |
| Abstract:Based on the calibrated GT-POWER model which focuses on working process of diesel engine in plain area, the influence of atmosphere on turbocharged diesel engine's output power and combustion characteristics are simulated. The results show:under external characteristics operating conditions, power reduces 14% mostly, fuel consumption increases 10%, exhaust temperature increases 100 ℃ the most, after-combustion is serious; when the altitude is from 0m to 4 000 m, the center of gravity of heat release rate delays 7℃A, HRRmax reduces 0.009 kJ/℃A, pmax reduces 1.6MPa, Tmax increases 220℃ above; under 1 400r/min,full load, the pmax and in-cylinder average temperature reach the highest level, when the engine speed increases, the velocity of HRR(heat release rate)gets lower; when the load increases, HRR increases, the combustion point is advanced. The simulation results supply a research foundation for power recovery and performance improvement of turbocharged diesel engine working in plateau area. |
| Key words: turbocharged diesel atmosphere pressure combustion characteristic〖FL |
