| 王浒，王海龙，夏明涛，郑尊清，李临蓬，尧命发.气道喷水和废气再循环对重型柴油机性能和排放影响的优化匹配试验研究[J].内燃机工程,2019,40(6):15-23. |
| Experimental Study on Effects of Inlet Water Injection and Exhaust Gas Recirculation on Performance and Emissions of a Heavy-Duty Diesel Engine and Corresponding Optimization Strategy |
| DOI：10.13949/j.cnki.nrjgc.2019.06.003 |
| Key Words:diesel engine inlet water injection exhaust gas recirculation（EGR） brake specific fuel consumption(BSFC) emissions |
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| Abstract:An experimental study of inlet water injection combined with high pressure(HP) exhaust gas recirculation(EGR) was conducted on a high pressure common rail heavy-duty diesel engine. The effects of introducing HP EGR and inlet water injection on diesel engine emissions and fuel economy were investigated at all working points of the world harmonized steady-state cycle(WHSC). Based on that, the optimization of the combustion phase at each working point was carried out to obtain an optimal control strategy of coupling inlet water injection with EGR over the WHSC cycle. The results show that, considering both the emissions and fuel economy, the HP-EGR should be introduced at low load conditions and the fuel injection timing should be advanced to obtain a better combustion phase. A small amount of inlet water injection and a proper rate of EGR should be adopted at medium and high load conditions, while the inlet water injection strategy should be adopted at full load. The weighted WHSC results show that the optimized weighted NOx specific emissions can be reduced by 7.71 g/(kW·h), a reduction of about 45.2%, and the weighted brake specific fuel consumption(BSFC) can be decreased by 1.20 g/(kW·h), while still maintaining low HC, CO and soot emissions. |
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