A four cylinder 2.5liter SI automobile engine operates at WOT on a four-stroke air standard Otto cycle at 3000rpm. The engine has a compression ratio of 8.6:1, a mechanical efficiency of 86% and a stroke-to-bore ratio S/B = 1.025. Fuel is isooctane with AF=15, a heating valve of 44,300kJ/kg and a combustion efficiency ƞc=100%. At the start of the compression stroke, conditions of the cylinder combustion chamber are 100kPa and 60°C. It can be assumed that there is a 4% exhaust residual left over from the previous cycle. Calculate the:   (a) Complete thermodynamic engine analysis of the engine, (b) Net indicated work during one cycle in kJ, (c) Indicated thermal efficiency

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IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.