喷氢时刻对进气道喷氢发动机混合气形成过程的影响  

Influence of Hydrogen-injected Timing on Fuel-air Mixture Formation of Hydrogen Engine with Port Fuel Injection

作　　者：黄研[1] 胡乐磊 杨亚坤[1] 

机构地区：[1]华北水利水电大学,河南郑州450045

出　　处：《华北水利水电大学学报（自然科学版）》2015年第1期66-69,85,共5页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

摘　　要：氢气以清洁燃烧的特点成为理想的发动机代用燃料.为研究不同喷氢时刻下氢发动机混合气形成的过程,应用AVL Fire软件建立进气道燃料喷射氢发动机的三维仿真模型.分析缸内外浓度场、速度场的变化规律,从抑制回火等抑制异常燃烧的角度,综合评价混合气的形成状况.并以混合气均匀性系数、有效喷氢率为指标优化了高速、大负荷工况下进气道喷射氢发动机的喷氢时刻.Hydrogen becomes an alternative fuel of engine because of clean combustion. To research the fuel-air mixture formation of hydrogen engine under different hydrogen-injected timings,a three-dimensional simulation model of hydrogen engine with port fuel injection was established using AVL Fire software. The variational regulations of concentration field and velocity field in and out a cylinder were analyzed,then the formation conditions of fuel-air mixture was comprehensively evaluated from the angle of abnormal combustion,such as backfire,and so on. According to the mixture uniformity coefficient and the effective hydrogen-injected rate,the hydrogen-injected timing of Hydrogen engine with port fuel injection was optimized under the conditions of high speeds and large loads.

关 键 词：氢发动机 混合气形成 喷氢时刻 均匀性 

分 类 号：TK431[动力工程及工程热物理—动力机械及工程]