Question

The mileage of a stationary twin cylinder petrol engine generating output power at 03 a rate of 10kW per liter of stroke volume is 0.257 kg/kWh. Determine the efficiency of conversion of combustion heat energy into useful power inside the cylinder if the volume of charge after compression is 0.2 liters in each cylinder. The engine is operating with a compression ratio of 11:1 and the fuel has a calorific value of 44MJ/kg. The crank case of the engine is designed to have a capacity of

4 liters in order to receive the incoming fresh air-fuel mixture. The total number of

firings for both the cylinders are 120000 per hour. Assume mean effective pressure

2 as 1N/mm

Answer 1

efficiency of conversion of combustion heat energy into useful power inside the cylinder will be 31.83%