A six-cylinder, four-stroke petrol engine has a swept volume of 3.0 litres with a compression ratio...

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A six-cylinder, four-stroke petrol engine has a swept volume of 3.0 litres with a compression ratio of 9.5. Brake output torque is 205 N-m at 3600 rpm. Air enters at 105 N/m² and 60°C. The mechanical efficiency of the engine is 85% and air-fuel ratio is 15:1. The heating value of fuel is 44,000 kJ/kg and the combustion efficiency is 97%. Calculate (a) the rate of fuel flow, (b) the brake thermal efficiency, (c) the indicated thermal efficiency, (d) the volumetric efficiency, and (e) the brake specific fuel consumption. [IAS, 2005] A six-cylinder, four-stroke petrol engine has a swept volume of 3.0 litres with a compression ratio of 9.5. Brake output torque is 205 N-m at 3600 rpm. Air enters at 105 N/m² and 60°C. The mechanical efficiency of the engine is 85% and air-fuel ratio is 15:1. The heating value of fuel is 44,000 kJ/kg and the combustion efficiency is 97%. Calculate (a) the rate of fuel flow, (b) the brake thermal efficiency, (c) the indicated thermal efficiency, (d) the volumetric efficiency, and (e) the brake specific fuel consumption. [IAS, 2005]

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