Numerical Simulation on the Combustion Characteristic of Gasoline Surrogate in Homogeneous Charge Compression Ignition Engine

In Homogeneous Charge Compression Ignition(HCCI) engine,combustion is controlled by chemical kinetics.Studies on chemical mechanism of the fuel are of great importance to understand and control HCCI engine.By CHEMKIN multi-zone model,the combustion characteristic of gasoline surrogate constituted by n-heptane,iso-octane and toluene are discussed.Unlike the single zone model,the results from our multi-zone model do not show a steep increase and abrupt turning pressure and temperature.A wider temperature distribution among zones leads to an advance of combustion and longer duration.Distribution of NOx among zones is similar with temperature distribution.HC and CO emissions are concentrated in zone one where the combustion is incomplete.