This paper describes a numerical study of fuel/air mixing processes for stoichiometric diesel combustion.
In order to overcome the deterioration of combustion efficiency that accompanies stoichiometric diesel
combustion due to poor mixing and lack of available oxygen, a new nozzle layout, namely a 2-spray-angle
group-hole nozzle, which consists a grouped upper spray plume (squish spray) and a lower spray plume
(bowl spray) was investigated. The KIVA code with updated physical and chemistry models, including the
KH-RT breakup model, 2-step phenomenological soot model, reduced n-heptane and GRI NOx mechanisms
was used for the calculations. An optimized 2-spray-angle group-hole nozzle with 170 squish
spray angle and 80 bowl spray angle showed significantly improved fuel consumption (178 g/kW h1)
compared to the baseline nozzle layout (213 g/kW h1) and the 2-spray-angle nozzle without holegrouping
(193 g/kW h1).
This paper describes a numerical study of fuel/air mixing processes for stoichiometric diesel combustion.In order to overcome the deterioration of combustion efficiency that accompanies stoichiometric dieselcombustion due to poor mixing and lack of available oxygen, a new nozzle layout, namely a 2-spray-anglegroup-hole nozzle, which consists a grouped upper spray plume (squish spray) and a lower spray plume(bowl spray) was investigated. The KIVA code with updated physical and chemistry models, including theKH-RT breakup model, 2-step phenomenological soot model, reduced n-heptane and GRI NOx mechanismswas used for the calculations. An optimized 2-spray-angle group-hole nozzle with 170 squishspray angle and 80 bowl spray angle showed significantly improved fuel consumption (178 g/kW h1)compared to the baseline nozzle layout (213 g/kW h1) and the 2-spray-angle nozzle without holegrouping(193 g/kW h1).
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