An eightCylinder fourstrokecycle engine has a bore of 10 cm

An eight-Cylinder four-stroke-cycle engine has a bore of 10 cm and a stroke of 12 cm. At a shaft speed of 53 rps, the brake power is 300 kw and the mechanical efficiency is 85%. Fuel with a heating value of 40,000 kJ/kg is supplied at a rate of 40 kg/hr. what are the engine displacement, BMEP, brake torque, indicated specific fuel consumption in kg/kw-hr. what are the engine displacement, BMEP, brake torque, indicated specific fuel consumption in kg/kw-hr, and indicated thermal efficiency?

Solution

Solution

Thermal efficiency is given as

Thermal efficiency = eta = 1- 1 /( r_k) ^{gamma - 1}

^Here rk = compression ratio

gamma = 1.4

rk = 1 + Vs / Vc

Putting this formula will be the right option.