Question

A four cylinder, four-stroke spark ignition engine with a total displacement of 2.4 L runs at 2500 rpm. The processes within each cylinder are modeled as an air-standard Otto cycle. At the beginning of the compression process (state 1), the air is at 85 kPa, 290 K. The compression ratio is 9 and the maximum temperature in the cycle is 2000 K. Determine:

a. net work output per cylinder (per cycle) kJ]
b. energy added by the combustion process per cylinder [kJ]
c. thermal efficiency
d. mean effective pressure
e. power output of engine [kW, horsepower

Answer 1

Network = 540.39 kj/kg

Energy added = 924.14 kj/kg

Thermal efficiency = 58.47%

Mean effective pressure = 225kPa

Step-by-step explanation:

See explanation in attached files pls