The effect of fuel equivalence ratio Φ on the start of combustion (SOC) and emissions in a homogeneous charge compression ignition (HCCI) engine has been studied using methane CH4 as surrogate of natural gas (NG) fuel. To enable the use of natural gas in HCCI engines, higher compression ratios is required to ensure the auto-ignition. For this purpose, a 0 D multi-zone thermo-kinetic model was adopted with 10 zones using the CHEMKIN-PRO software. Only the closed portion of the cycle (from IVC to EVO) was simulated and no valve event or gas exchange process is considered in this model. The investigation was performed on a four-stroke single cylinder engine running at a fixed speed of 800 rpm. The operating conditions of the engine used in this work were an IVC pressure and temperature of 1.6 bar and 417 K respectively, compression ratio of 18.8:1, with varying fuel equivalence ratio Φ from 0.20 to 0.45 by step of 0.05. Since pressure and temperature profiles plays a very important role in reaction path at certain operating conditions, an attempt had been made here to present a complete reaction path investigation and absolute rate of production (ROP) on the formation/destruction of chemical species at peak temperature and pressure conditions in the first zone #1, middle zone #5 and last zone #10 for Φ = 0.20 and Φ = 0.45.
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