A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque being correspondingly adjusted. The brake power (bp) measurements are the following: With all cylinders firing = 12.5 kW With cylinder No. 1 cut off = 9 kW With cylinder No. 2 cut off = 9.15 kW With cylinder No. 3 cut off = 9.2 kW With cylinder No. 2 cut off = 9.1 kW The lower calorific (or heating value, LCVf) of the fuel is 44100 kJ/kg. The clearance volume (Vcl) of one cylinder 70.0 x 103 mm3. Determine: (a) Indicated power (ip) of the engine under these conditions. (b) The indicated thermal efficiency (c) The relative efficiency of this engine.
A four-stroke SI engine 0.08 m bore (d), 0.10 m stroke (L), is tested at full throttle at constant speed. The fuel supply is fixed at 0.0011333 kg/s and the spark plugs of the four cylinders are successively short circuited without change of speed, brake torque being correspondingly adjusted. The brake power (bp) measurements are the following:
With all cylinders firing = 12.5 kW
With cylinder No. 1 cut off = 9 kW
With cylinder No. 2 cut off = 9.15 kW
With cylinder No. 3 cut off = 9.2 kW
With cylinder No. 2 cut off = 9.1 kW
The lower calorific (or heating value, LCVf) of the fuel is 44100 kJ/kg. The clearance
volume (Vcl) of one cylinder 70.0 x 103 mm3. Determine:
(a) Indicated power (ip) of the engine under these conditions.
(b) The indicated thermal efficiency
(c) The relative efficiency of this engine.
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