Availability Analysis Of Blends Fuel Components Combustion In Internal Combustion Engine

This paper studies availability of fuel components combustion in Internal CombustionEngine, analyzes the detailed hydrocarbon composition of blends fuel components(straight-distillation gasoline, FCC gasoline and reformed gasoline)in the refinery. The threekinds of blends fuel are replaced by different proportions of iso-octane, n-heptane, methylcyclohexane, toluene, and1-pentene in different proportions.For spark ignition engines, the blends fuel components model and thermodynamicdual-zone model are developed to investigate fuel the variation of cylinder pressure andtemperature, the availability and the exergy destruction with the crank angle during thecombustion process. The study shows that: exergy destruction is related to the content andkinds of the blends fuel component compositions. Also, the influence of the maincombustion parameters (the starting of combustion angle, combustion duration, compressionratio) on the exergy destruction is studied, that provides a basis for optimizing theperformance of the engine.A thermodynamic single zone combustion model and the availability balance model oncombustion process, combined with skeleton mechanism for primary reference fuels, aredeveloped in the low temperature combustion engine to investigate the system variation. Andthe influence of the important combustion reaction radicals on the availability conversion isalso studied. Moreover, the effect of the ratio of iso-octane and n-heptane on the availabilityof the low temperature combustion is also studied.To study the impact of fuel components content in gasoline on emissions, the EmissionCharacteristics are tested in a single-cylinder gasoline engine for the No.93gasoline（certainenterprise）, the No.93gasoline（sinopec）,straight-distillation gasoline, FCC gasoline andreformed gasoline. The emission characteristics of the No.93gasoline（certain enterprise）arevery poor; CO emissions, HC emissions and NOxemissions in the engine tested decreasedwith the increase of olefin content; with the increase of the aromatic content, CO emissions,HC emissions and NOxemissions decrease.