Effects of Mixing and Chemical Parameters on Thermal Efficiency Based on a Partially Premixed Combustion Diesel Engine
A hybrid combustion control strategy based on partially premixed combustion （PPC） diesel en- gine was developed for high thermal efficiency and near zero emissions in a wide engine-operation range up to IMEP of 1.1 MPa.The combustion control parameters of mixing and chemical, including fuel injec- tion timing, injection rate pattern （such as multi-pulse injection）, boost pressure and exhaust gas recirculation （EGR）and in-cylinder temperature regulated by intake valve closing timing, must be deliberately matched for pursuing the combustion paths of equivalence ratio and temperature, avoiding of entering the formation zones of soot and NOx.In this study the effects of mixing and chemical parameters on thermal efficiency were investigated by energy balance analysis from first law of thermodynamics. It was found that thermal efficiency is more sensitive to combustion control parameters than emissions in clean PPC.
diesel enginepartly premixed combustionhybrid combustion control strategythermalefficiencyemissions
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NSTL
万方数据
维普
