Abstract
A single zone S.I. engine model based on the physical geometries (bore, stroke, crank radius, and connecting rod length), variation of specific heats of gas mixture (air-fuel mixture and combustion products) and chemical equilibrium has been developed in an in-house code to predict the pressure and temperature variation along crank angle, work done, mean effective pressure, power output and other engine parameters suitable for biogas. The intake model has also been incorporated in the developed model. Model has been validated using biogas (methane). Effect of spark timing in spark ignition model have been observed and optimized to obtain maximum work as well as brake mean effective pressure with biogas. It has been observed that at 27° BTDC spark timing give the best performance. The spark ignition model at optimized condition, the brake thermal efficiency is calculated as 24% and brake mean specific fuel consumption is 0.29 m³/kWh.
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