During an experiment in the laboratory, a ten cylinder, four stroke spark ignition engine with a bore of

85.5mm

shows that the shaft speed is

7000rpm

. The stroke of the engine is

0.09m

, and the calorific power is

45M(J)/(k)g

. Determine:\ i. The average speed of the piston.\ ii. The thermal efficiency of the cycle for volumetric compression ratio of 3.4.\ iii. The real work obtained through the cycle (assume both real and mechanical efficiencies equal to 0.7 , and air-to-fuel mass ratio equal to 15 ).\ iv. The real (or brake) power obtained through the cycle (assume both real and mechanical efficiencies equal to 0.7 , and air-to-fuel mass ratio equal to 15 ).\ v. The brake specific fuel consumption.\ vi. The indicated power and the indicated mean pressure.

During an experiment in the laboratory, a ten cylinder, four stroke spark ignition engine with a bore of 85.5mm shows that the shaft speed is 7000rpm. The stroke of the engine is 0.09m, and the calorific power is 45MJ/kg. Determine: i. The average speed of the piston. ii. The thermal efficiency of the cycle for volumetric compression ratio of 3.4. iii. The real work obtained through the cycle (assume both real and mechanical efficiencies equal to 0.7 , and air-to-fuel mass ratio equal to 15 ). iv. The real (or brake) power obtained through the cycle (assume both real and mechanical efficiencies equal to 0.7 , and air-to-fuel mass ratio equal to 15 ). v. The brake specific fuel consumption. vi. The indicated power and the indicated mean pressure