DieselShip's Online Content Library

Q1. The following bara refer to a 20 cylinder 4-stroke diesel engine under test:

Bore diameter 280 mm

Stroke length 330 mm

Speed of rotation 1000 rev/min

Brake torque 86 kN m

Fuel consumption 1.71 tonne/h

Calorific value of fuel 42 MJ/kg

The fuel supply to each cylinder is cut off in turn, and the brake torque is adjusted each time so that the speed returns to 1000 rev/min. The mean value of the torques thus measured is 81.23 kN m. Determine EACH of the following:

(a) The brake power; (2)

(b) The mechanical efficiency; (5)

(c) The brake specific fuel consumption (kg/kW h); (2)

(d) The average value of indicated mean effective pressure;(4)

(e) The brake thermal efficiency. (3)