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

. A twin-cylinder 2-stroke engine has a swept volume of 150 cm3
. The maximum power output is 19 kW at 11,000 rpm. At this
condition, the bsfc is .11kg/MJ and the gravimetric air/fuel ratio
is 12:1. If ambient test conditions are 10 C, 1.03 bar and the fuel
has a calorific value of 44 MJ/kg, calculate the bmep, the
arbitrary overall efficiency and the volumetric efficiency.

A high performance 4 stroke supercharged gasoline engine is
being designed. The target specifications are as follows:
IMEP: 31 bar at peak power
bsfc: 233 g/kWh
isfc: 205 g/kWh
Bore to stroke ratio: 1..04
Number of cylinders: 4
Maximum mean piston speed: 24 m/s
Compression ratio: 10:1
Simulation results indicate that the indicated work per
cylinder per cycle needs to be 1400 J/cyl/cyc.
Based on the provided information, finalize the engine design
for the following parameters:
Bore and stroke (mm)...

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