毕业设计（论文）--供油提前角对柴油机性能的影响.docVIP

供油提前角对柴油机性能的影响 摘 要 柴油机在各种动力机械中之所以占优势的主要原因是经济性好。近些年来，随着柴油机技术的发展，，，；；NOx含量最有效的办法是延迟喷油，即减小供油提前角，使燃烧拖后在较低的温度下进行。因此存在最佳喷油提前角的问题。 通过柴油机台架试验，分析供油提前角变化对柴油燃料发动机排放的影响。试验结果表明:供油提前角提前，柴油燃料的有效燃油消耗率降低。随着供油提前角减小，燃料滞燃期缩短，供油提前角为15oCA时，燃料的燃烧持续期最短，增加或减少供油提前角都将延长燃烧持续期。供油提前角变化对柴油燃料发动机的排放有较大影响，推迟供油，燃料的烟度排放和CO排放增加，NOx排放与HC排放降低。 关键词:柴油机；供油提前角；排放特性；台架试验。 Effect of Fuel Supply Advance Angle on an internal Combustion Engines Abstract In various mechanical power of diesel engine is the main reason is the dominant economical. In recent years, along with the development of technology, the diesel engine is still in improving efficiency. To improve the efficiency and adopted various measures. For example: change injection advance, improve the injection pressure injection rate and injection, shorten the duration, Optimized chamber shape, improve ventilation process, Using efficiency, create the supercharger turbo systems of various forms, By including the electronic governor, injection system, electronic control system, Reducing friction and improve mechanical efficiency, etc. And fuel system of diesel injection time of performance and emission plays a crucial influence. Usually the economy and to meet the requirements for the best diesel injection advance greatly, But a lot of practice and suggests that reducing exhaust in the most effective way to content NOx injection, which is the delay reduced injection advance, burning up under the low temperature. Therefore there are best injection Angle. Through the analysis of test, diesel injection advance changes of diesel fuel combustion emissions. Test results show that the injection advance in advance, With fuel injection advance, fuel injection advance to shorten, 15 o CA, fuel burning shortest duration, increase or decrease of injection advance will extend combustion duration. Injection advance changes on diesel fuel emissions have great influence on the fuel supply, delay, meet emission and CO emissions, NOx emissions and HC emissions reduction.