DME／柴油混合燃料HCCI燃烧与排放特性的试验研究  

Experimental Study on HCCI Combustion and Emissions with DME/Diesel Oil Blend

作　　者：余敬周[1] 张煜盛 Elkelawy M 邱奎[1] 谌祖迪[1] 

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074

出　　处：《内燃机工程》2010年第4期11-16,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家重点基础研究发展规划项目(2007CB210001);国家自然科学基金项目(50676036;20777023);高等学校博士学科点专项科研基金项目(20060487043)

摘　　要：在单缸柴油机上采用轴针式喷嘴进气道燃油喷射方式，开展了二甲醚（DME）／柴油混合燃料预混均质压燃（HCCI）燃烧及其排放特性的试验研究，探讨了喷油嘴启喷压力、进气温度以及进气掺混不同比例CO2对混合气制备率和发动机性能的影响。结果表明：低沸点液相DME在进气道喷射过程中所具有的闪急沸腾效应，可有效强化柴油／DME混合燃料的雾化与蒸发，减少燃油撞击壁面而出现的进气歧管壁湿现象，从而改善柴油HCCI发动机均质混合气的形成与燃烧，拓宽发动机的运行工况范围。进气掺混0～30％的CO2能使HCCI发动机的正常工作范围从0．32MPa提高到0．5MPa，实现高负荷工况下同时降低NOx和碳烟的排放，但CO和未燃HC排放有所增加。The homogeneous charge compression ignition （HCCI） combustion of DME and diesel oil blend was investigated in a modified single cylinder diesel engine. The blend fuel was injected into intake port by means of a pintle nozzle. The effects of injection pressure, inlet air preheating and CO2 addition ratio on engine performance and emission characteristics were studied. The results show that flash boiling effect occurred during the liquid DME of low boiling point being injected into the intake port may enhance atomization and evaporation of the blend fuel, relieving the intake port wall wetting resulted from fuel impinging to wall. Thereby both mixture formation and combustion are improved, and the engine operation range is extended. As the proportion of CO2 addition is increased from 0 to 30 %, the brake mean effective pressure （BMEP） is extended from 0. 32 MPa to 0.5 MPa, at high load NO. and soot emissions decrease simultaneously, but uric and CO emissions increase slightly.

关 键 词：内燃机 DME/柴油混合燃料 预混均质压燃 混合气制备率 燃烧 排放 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]