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Date of Publication:2014-01-01

Journal:内燃机工程

Volume:35

Issue:6

Page Number:54-59

ISSN No.:1000-0925

Abstract:To improve spray impingement on wall and atomization in diesel engine
   combustion chamber, a double-layer diffluent combustion system with
   circular guiding collision boss was proposed for DI diesel engine. In
   this combustion system, the spray double-layer diffluence and secondary
   atomization were realized by matching the combustion chamber geometry
   with fuel spray to mix fuel and air sufficiently and utilize air in the
   clearance space effectively. Simulation results indicate that in the
   double-layer diffluent combustion system fuel density distribution
   becomes more homogeneous, leading to temperature distribution in the
   combustion chamber relative uniform during combustion process.
   Experimental results demonstrate that brake specific fuel consumption
   and soot emission decrease by 5.5% and 25.5% respectively while engine
   NO_x emissions increase about 12.4% for the type Ⅱ double-layer
   diffluent combustion system at three different fuel injection advance
   angles compared to conventional omega combustion system.

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