PFI氢内燃机的氢-空气混合特性  

Hydrogen-air Mixture Characteristics of PFI Hydrogen Internal Combustion Engine

作　　者：段俊法[1,2] 刘福水[1] 孙柏刚[1] 

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]华北水利水电大学机械学院,河南郑州450045

出　　处：《车用发动机》2014年第3期29-32,共4页Vehicle Engine

基　　金：国家自然科学基金资助项目(51276019);河南省教育厅科学技术研究重点支持项目(14B470016)

摘　　要：以1台4缸进气道燃料喷射内燃机为基础,建立了包含进气管道和气缸的氢内燃机进气系统三维仿真模型。提出用混合气不均匀性系数来评价氢-空气混合状况,仿真研究了氢内燃机边界条件下的进气气流运动规律和混合过程,发现氢-空气混合状况主要取决于气流的搬运作用和扩散面积。探讨了氢气喷射相位和喷射压力对氢-空气混合速度和混合均匀性的影响,并以不均匀性系数为指标优化了PFI氢内燃机不同转速和当量比下的喷射相位与喷射压力。A 3D simulation model of air intake system including intake pipe and cylinder was built based on a 4-cylinder and in-take port fuel injection hydrogen internal combustion engine .The non-uniformity coefficient was put forward to evaluate the mixing condition of hydrogen-air mixture .The intake air flow movement and mixing process of hydrogen internal combustion engine in the boundary conditions was simulated and researched with the model .It was found that the key factors for mixing condition were airflow carrying function and diffusion area .In addition ,the influence of hydrogen injection pressure and timing on hydrogen-air mixing velocity and uniformity was investigated and the injection timing and pressure of different engine speed and equivalent ratio were optimized according to the non-uniformity coefficients .

关 键 词：氢内燃机 进气道燃料喷射 混合气形成 均匀性 喷射相位 

分 类 号：TK431[动力工程及工程热物理—动力机械及工程]