燃烧方式对氢内燃机燃烧和排放的影响研究  

Effect of Different Combustion Modes on Combustion and Emission Characteristics of Hydrogen Internal Combustion Engine

作　　者：段俊法 唐建鹏 张宇 魏巍 李权才 DUAN Junfa;TANG Jianpeng;ZHANG Yu;WEI Wei;LI Quancai(North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]华北水利水电大学机械学院,河南郑州450045

出　　处：《车用发动机》2018年第5期82-86,共5页Vehicle Engine

摘　　要：基于氢内燃机试验样机建立内燃机三维实体模型,耦合详细氢空气化学反应机理,运用Converge软件建立氢内燃机CFD仿真模型并进行验证,仿真分析了中高负荷下稀薄燃烧和当量燃烧两种燃烧方式下氢燃料内燃机的燃烧特性和NO_x排放规律。仿真结果表明:在氢气供给量相同的情况下,稀薄燃烧比当量燃烧速度更快,OH浓度更高,因而稀薄燃烧会得到更高的缸内压力,更有利于动力性的发挥;两种燃烧方式下的缸内最高平均温度较为接近,但当量燃烧方式下最高温度相位相对滞后,可以有效降低NO_x排放。采用EGR技术可以实现当量燃烧,但过大的EGR率也会带来内燃机动力性能下降。Based on the prototype of hydrogen internal combustion engine,a three-dimensional solid model of internal combustion engine was built.Then the mechanism of hydrogen gas chemical reaction was coupled and the CFD simulation model of hydrogen internal combustion engine was established with Converge software and verified.The combustion characteristics and NO x emission rules of hydrogen-fueled combustion engine were studied in the modes of lean burn and equivalent combustion.The simulation results show that the lean burn is faster than the equivalent combustion and the OH concentration is higher and hence the lean burn will produce a higher cylinder pressure which is more beneficial to the higher power in the case of the same hydrogen supply.The in-cylinder maximum average temperature of the two combustion modes is almost the same,but the crankshaft angle of highest temperature in the equivalent combustion mode is relatively backward,which can effectively reduce NO x emission.EGR technology can realize equivalent combustion,but the too large EGR rate will bring about the dynamic performance decrease of internal combustion engine.

关 键 词：氢发动机 稀薄燃烧 当量燃烧 燃烧特性 氮氧化物 

分 类 号：TK421.2[动力工程及工程热物理—动力机械及工程]