吉林大学学报(工学版) ›› 2016, Vol. 46 ›› Issue (5): 1484-1493.doi: 10.13229/j.cnki.jdxbgxb201605016

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Influence of ultra-high pressure injection on mixed gas formation,combustion and emission characteristics of DI diesel engine

JIANG Tao, LIN Xue-dong, LI De-gang   

  1. State Key Laboratory of Automotive Simulation and Control,Jilin University, Changchun 130022,China
  • Received:2015-07-20 Online:2016-09-20 Published:2016-09-20

Abstract: The effect of ultra-high pressure injection on the formation mechanism of mixed gas and on combustion process is studied. The influence of high pressure injection on the spray characteristics and the concentration field etc is analyzed; the influence of high pressure injection on the jet number and its variation law in different space positions in the injection direction is also analyzed on a CR 2.0L direct injection diesel engine. Both simulation and experiments are carried out to predict the influence of ultra-high pressure injection on the engine performance. Results show that, as the injection pressure appropriately increases the jet number increases and the range of jet number expands, the spray quality is improved and the duration of combustion is shortened. High injection pressure also can reduce the thickness of the fuel film and the residence time in the combustion chamber wall, thus, the emission of HC is reduced. However, high pressure injection may lead to over high average combustion temperature inside the cylinder, which results the increases not only in NO emission but also in CO emission because of CO2 high temperature decomposition.

Key words: power machinery engineering, DI-diesel engine, high pressure injection, spray characteristics, number of Jet, combustion, emission

CLC Number: 

  • TK421.2
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