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直喷式柴油机双层分流燃烧系统的数值模拟与试验研究

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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: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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