A four stroke diesel engine of 3000cc capacity develops 14kW per m3 of free air induced per minute. When running at 3500 rev/min it has a volumetric efficiency of 85 percent referred to free air-conditions of 1.013 bar and 27°C. It is proposed to boost the power of the engine by supercharging by a blower (driven mechanically from the engine) of pressure ratio 1.7 and isentropic efficiency of 80 percent. Assuming that at the end of induction the cylinders contain a volume of charge equal to the swept volume, at the pressure and temperature of the delivery from the blower, estimate the increase in bp to be expected from the engine. Take overall mechanical efficiency as 80 percent g for air =1.4,
R = 0.287 kJ/kg K.