Question:
The following data refers to a trial conducted on 4-stroke petrol engine
Air-fuel ratio (by mass)
= 15.5 : 1
Heat value of fuel
= 48000 kJ/kg
Mechanical efficiency
= 82%
Air standard efficiency
= 54%
Relative efficiency
= 70%
Volumetric efficiency
= 80%
Speed = 240 rpm
Brake power = 75 kW
Calculate :
i) Compression ratio
ii) Indicated thermal efficiency
iii) Brake specific fuel consumption.
Answer:
