The average indicated power in C.I. engine is $15kw/m^{3}$ of free air inducted per Minute. It is a four stroke engine having swept volume 3.4 liter. The speed of the engine is 3300 rpm and has a volumetric efficiency 80% referred to free air conditions of 1.013 bar and 22°C. It is proposed to provide with a blower, driven mechanically from the engine. The blower has the pressure ratio 1.8 and adiabatic efficiency 75%. It can be assumed that at the end of suction, in the supercharged condition, the cylinder contains a volume of air equal to the swept volume at the pressure and temperature of delivery from the blower. Calculate the net increase in break power. Take Mechanical efficiency of engine and blower as 80% .

I.P. = 15 kW/m 3 of free air

N =3300 rpm

V = 3.4 litre = $3.4 X 10^{-3} m^{3}$

$η_{v}$ = 80 % = 0.8

$p_{1}$ = 1.013 bar

$T_{1}$ = 22°C = 295 K

$η_{ad}$ = 75 % = 0.75

$η_{m}$ = 0.8

(i) Unsupercharged engine :

Swept …