摘要
对一台采用高压废气再循环系统(HP-EGR)的VGT柴油发动机进行台架试验,结合试验数据用GT-Power软件搭建出原机仿真模型。在此模型基础上,添加一条低压废气再循环(LP-EGR)回路,构成双循环废气再循环系统(dual-EGR)。仿真分析在某些稳态工况下,HP-EGR和LP-EGR所占废气再循环总量比例变化对该柴油机氮氧化物(NO_x)排放和比油耗(BSFC)的影响,并进行试验验证。研究结果表明:LP-EGR所占比例在一定程度内提高可以降低进气温度,降低NO_x排放量,提高的程度取决于中冷器的冷却能力,NO_x排量至少可降低0.4g/(kW·h);BSFC也随LP-EGR比例的升高,进气温度的降低而降低,但其同时还受VGT叶片开度的影响,BSFC至少可降低8.5g/(kW·h)。
The performance data of a HP-EGR VGT diesel engine were measured on the test bench and a simulation model was established by use of GT-Power. Based on this model a LP-EGR loop was added to form a Dual-EGR system. The effects of HP-EGR and LP-EGR on NOx emission and BSFC were analysed under steady state conditions. Results show that increasing the proportion of LP-EGR in total EGR can reduce intake air temperature and NOx emission, and the degree of improvement depends on the cooling capacity of intercooler, NOx emission can be reduced by least 0.4 g/（kW · h） and BSFC reduced by at least 8.5 g/（kW · h） with the increase in the proportion of LP-EGR in total EGR and the decrease of the intake air temperature, but also the influence of VGT blade opening, so using GT-Power simulation model can provide engineering guidance for future research.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2016年第6期58-63,71,共7页
Chinese Internal Combustion Engine Engineering
