车用大功率柴油燃烧器的研制

Development of High-Power Diesel Burner for Automobile

针对商用车越来越严苛的NO_(x)排放法规,解决低温冷起动阶段NO_(x)的排放问题尤为重要。设计了一种车用大功率柴油燃烧器系统,用于低温冷起动过程中快速提升排气温度,使选择性催化还原器(SCR)入口温度迅速达到尿素起喷温度。详细阐述了系统方案及核心零部件的开发。利用STAR-CCM+仿真软件,对优化结构进行点火及燃烧仿真,详细分析了燃烧状态的温度分布、柴油挂壁、碳烟分布、燃烧效率、燃烧背压等。最后经过台架试验验证,冷态世界统一瞬态循环(WHTC)工况NO_(x)转换效率达97.9%,升温能力与升温速率远超常规热管理技术,同时油耗还有一定优势。

With the restriction of increasingly strict NO_(x)emission regulation for commercial trucks,it is especially important to deal with low temperature NO_(x)emission.It developed a high-power diesel burner system to heat the exhaust quickly and to make the SCR inlet temperature quickly reach the urea starting temperature for cold starting.It introduced the details of system development solutions and key components development.With STAR-CCM+software simulate firing and burning of the optimized burner,it particularly analyzed temper-ature distribution,fuel hanging,soot distribution,combustion efficiency and back pressure in combustion state.In the end,according to bench test,NO_(x)conversion efficiency achieved to 97.9%in cold-start WHTC,and heating capacity and heating rate of burner were far exceeding other thermal management technologies,moreover,the fuel consumption had certain advantages.