汽油混氢内燃机稀燃性能的仿真研究  

Simulation of Lean Combustion Characteristics of a Spark Ignition Engine Fueled With Gasoline-Hydrogen Fuel Mixture

作　　者：纪常伟[1] 闫皓[1] 汪硕峰[1] 张擘[1] 张旻玥[1] 周小龙[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100124

出　　处：《北京工业大学学报》2012年第3期417-422,共6页Journal of Beijing University of Technology

基　　金：北京市自然科学基金资助项目(3122006);北京市教委科技计划重点项目(KZ20120005002)

摘　　要：在进气混氢体积分数为0、1%、3%和6%的条件下进行了汽油混氢发动机在低速、低负荷以及稀燃时的内燃机台架试验.根据试验得到的不同工况下发动机的缸压、进气流量及平均有效压力等数据对基于AVL Boost软件所建立的汽油混氢内燃机仿真模型进行了标定.利用该模型对相同进气压力、不同混氢体积分数和不同过量空气系数的条件下汽油混氢内燃机的稀燃性能进行了仿真.结果表明,混氢对稀燃时发动机低速、低负荷工况的燃烧过程改善效果较为明显,随着混氢体积分数的增加,稀燃时发动机指示热效率和做功能力均有所提高.相同混氢体积分数下,随着过量空气系数的增大,缸压峰值降低,缸压峰值所对应曲轴转角位置推迟.稀燃时,混氢后发动机火焰发展期和传播期明显缩短,缸压峰值升高且缸压峰值所对应的曲轴转角也有所提前.Abstract： An experiment on the test bench is first carried out to investigate the performance of a hydrogen-enriched engine at low speed, low load and lean conditions in this paper. The hydrogen volumefraction in the intake is kept at 0, 1% , 3% and 6% for a specified excess air ratio, respectively. A simulation model is built based on AVL Boost software. The measured data, such as cylinder pressure,intake air flow rate and effective pressure, are used to validate and calibrate the model. Then, the performance of a hydrogen-enriched gasoline engine at a specified intake manifolds absolute pressure withdifferent hydrogen volume fractions in the intake and excess air ratios is investigated through the model. Simulation results show that hydrogen enrichment is effective in improving the engine performance at lowload, low speed and lean conditions. The engine indicates that the thermal efficiency and working ability are improved with increasing hydrogen addition fraction at lean condition. For a specified hydrogenblending level, the peak cylinder pressure is reduced and the relevant crank angle for the peak cylinder pressure is retarded with the increase of the excess air ratio. Under lean condition, both flamedevelopment and propagation periods are shortened, cylinder pressure is enhanced, and the relevant crank angle for the peak cylinder pressure is advanced after hydrogen addition.

关 键 词：汽油 氢气 稀燃 发动机 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]