燃烧室对醇醚燃料发动机排放影响的数值模拟
Numerical Simulation of Effects of Combustion Chamber on the Emissions of Alcohol-ether Fuel Engine

为了研究燃烧室形状对醇醚燃料发动机排放的影响，应用AVL_Fire软件模拟研究5种不同形状的燃烧室对发动机燃烧过程和排放的影响。结果表明：不同形状的燃烧室对湍动能的影响主要在上止点附近；不同燃烧室内NO的生成区域较大，基本遍布于整个燃烧室内，而Soot主要分布在温度高的油束附近和凹坑壁面处；直口燃烧室A和敞口燃烧室B内的Soot排放均较低，NO排放均较高；缩口平底燃烧室D的NO排放很少而Soot排放高；缩口尖底燃烧室E内的NO和Soot排放均较低，具有较好的排放特性。
In order to study the impact of combustion chamber shape on the alcohol ether fuel engine emissions, the combustion process and emission characteristics of engines with five different combustion chamber shapes were numerically simulated by the software AVL_Fire. The results show that, the effects of combustion chamber shape on the turbulent kinetic energy mainly appear near the TDC. The NO formation area is large and it spreads basically throughout the entire combustion chamber. But Soot is mainly distributed near the high temperature oil beam and the pit wall. Straight chamber A and the open chamber B have lower soot emission but higher NO emission.The narrow caliber and flat base chamber D discharges less NO but more soot. The NO and soot emissions of the narrow caliber and sharp base chamber E are both lower, which means the emission characteristics is better