An open, ideal Otto-cycle engine has a compression ratio of 10. The air just prior to the compression stroke is at 20 ºC and 100 kPa. The maximum cycle temperature is 2000 ºC. The thermal efficiency of the ideal, Otto cycle is 0.6. Rather than simply discharging the air to the atmosphere after expansion in the cylinder, an isentropic turbine is installed in the exhaust to produce additional work. Assume constant specific heats, the mass flow rate through the turbine is steady and the pressure at the inlet to the cylinder is identical to the pressure at the discharge of the turbine. a) draw a T-s process diagram for the compound engine b) determine the work output of the turbine, (kJ/kg) c) determine the overall thermal efficiency
An open, ideal Otto-cycle engine has a compression ratio of 10. The air just prior to the compression stroke is at 20 ºC and 100 kPa. The maximum cycle temperature is 2000 ºC. The thermal efficiency of the ideal, Otto cycle is 0.6. Rather than simply discharging the air to the atmosphere after expansion in the cylinder, an isentropic turbine is installed in the exhaust to
produce additional work. Assume constant specific heats, the mass flow rate through the turbine is steady and the pressure at the inlet to the cylinder is identical to the pressure at the
discharge of the turbine.
a) draw a T-s process diagram for the compound engine
b) determine the work output of the turbine, (kJ/kg)
c) determine the overall thermal efficiency of the compound engine
d) What is the impact on the net work output of the Otto-cycle, if the air is
discharged to the atmosphere (Without calculations)
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 1 images
