O_2/CO_2环境下柴油机燃烧特性数值模拟  

Numerical Simulation on Diesel Engine Combustion Characteristics in O_2/CO_2 Environment

作　　者：陈汉玉[1,2] 左承基[1] 王作峰[1] 王对对[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,合肥230009 [2]浙江大学能源工程学系,杭州310027

出　　处：《农业机械学报》2014年第1期27-33,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：教育部博士学科点专项基金资助项目(20130111120021);安徽省自然科学基金资助项目(1308085QE79);内燃机燃烧学国家重点实验室开放基金资助项目(K2011-09);合肥工业大学青年教师科研基金资助项目(2012HGXJ0669)

摘　　要：为了突破柴油机'NOx-Soot'折中曲线的束缚,提出基于O2/CO2环境的柴油机燃烧新模式,运用AVL-FIRE软件对发动机缸内压力、温度场分布及整机动力性能进行数值模拟,分析不同参数对柴油机燃烧特性的影响,从而获得最佳的O2/CO2摩尔百分比,最后在光学发动机上对典型曲轴转角时刻缸内燃烧过程进行了可视化研究。仿真结果表明,当供油提前角不变时,O2低于50%时,缸内柴油无法着火燃烧;O2为65%、CO2为35%是该方案中的最佳参数组合;当改变供油提前角时,O2为50%、CO2为50%是该方案中的最佳参数组合。光学可视化试验表明,O2/CO2环境的最大压力升高率时刻、最大放热率时刻缸内平均温度均低于正常空气时,而最大爆发压力时刻的缸内平均温度略高于正常空气时;和正常空气相比,O2/CO2环境的主燃烧期扩散燃烧速率提高约37.6%。In order to break through the ＂NOx-Soot＂ trade-off curve bound of the diesel engine, a new diesel engine combustion mode in the OJCO2 environment is proposed. The pressure, temperature fields distribution of the cylinder and the power performance of the engine were simulated by AVL - FIRE software. The influence of various parameters on the engine combustion characteristics were analyzed, so the optimal OJCO2 mole percent was obtained. Finally, the visualization research of combustion process in cylinder was carried out on the optical engine test bench. The simulation results indicate that when the injection advance angle is unchanged, fuel can＇t be ignited or burnt as 02 is below 50% , and the mole percent that 65% 02 and 35% CO2 is the optimum in this scheme;when the injection advance angle is changed, the scheme that 50% 02 and 50% CO2 is the optimum. The visualization tests show that the average temperature in cylinder is lower at the maximum pressure rise rate and the maximum heat release rate, nevertheless the average temperature in cylinder is slightly higher at the peak pressure in the O2/CO2 environment compared to that in the normal intake environment. The diffusion combustion speed during the main combustion period approximately increases by 37. 6% in the O2/CO2 environment compared with that in the normal intake environment.

关 键 词：柴油机O CO环境燃烧特性 数值模拟 可视化 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]