Abstract
A multi-pulse injection strategy for premixed charge compression ignition (PCCI) combustion was investigated in a four-valve, direct-injection diesel engine by a computational fluid dynamics (CFD) simulation using KIVA-3V code coupled with detailed chemistry. The effects of fuel splitting proportion, injection timing, spray angles, and injection velocity were examined. The mixing process and formation of soot and nitrogen oxide (NOx) emissions were investigated as the focus of the research. The results show that the fuel splitting proportion and the injection timing impacted the combustion and emissions significantly due to the considerable changes of the mixing process and fuel distribution in the cylinder. While the spray, inclusion angle and injection velocity at the injector exit, can be adjusted to improve mixing, combustion and emissions, appropriate injection timing and fuel splitting proportion must be jointly considered for optimum combustion performance.
Highlights
Plenty of studies [1,2,3,4] have demonstrated that the Premixed Charge Compression Ignition (PCCI)combustion strategy can be a practical solution to meet the increasingly stringent emission regulations due to its potential for suppressing the formation of nitrogen oxides (NOx) and soot simultaneously.Premixed combustion with a long ignition delay allows sufficient time for the formation of a uniform mixture before the start of combustion
Utilizing a high level of Exhaust Gas Recirculation (EGR), the combustion can be performed under low temperature conditions, which are below the NOx formation region
The study presented in this paper investigated the behavior of multiple injections in a diesel PCCI
Summary
Plenty of studies [1,2,3,4] have demonstrated that the Premixed Charge Compression Ignition (PCCI)combustion strategy can be a practical solution to meet the increasingly stringent emission regulations due to its potential for suppressing the formation of nitrogen oxides (NOx) and soot simultaneously.Premixed combustion with a long ignition delay allows sufficient time for the formation of a uniform mixture before the start of combustion. Plenty of studies [1,2,3,4] have demonstrated that the Premixed Charge Compression Ignition (PCCI). Utilizing a high level of Exhaust Gas Recirculation (EGR), the combustion can be performed under low temperature conditions, which are below the NOx formation region. Representative research about the effects of equivalence ratio (Ф) and temperature (T) on the formation of NOx and soot was introduced by Kamimoto [5]. Based on his studies, Sun [6] placed the PCCI, Homogeneous Charge
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