Air is used as the working fluid in a Diesel cycle with nonidealities. Some important pieces of information regarding the cycle are: ● The nonidealities occur during the adiabatic compression and expansion processes. ● At the beginning of the compression process, the air is at 95 kPa and 22°C. ● The pressure bounds (i.e. the minimum and maximum pressure) for this non-ideal cycle are the same as they would be under ideal operating conditions. ● Ideally, the compression ratio for this cycle would be ?_ideal = 10. ● The specific volume at the end of the isobaric expansion is the same for the real cycle an
Air is used as the working fluid in a Diesel cycle with nonidealities. Some important pieces of information
regarding the cycle are:
● The nonidealities occur during the adiabatic compression and expansion processes.
● At the beginning of the compression process, the air is at 95 kPa and 22°C.
● The pressure bounds (i.e. the minimum and maximum pressure) for this non-ideal cycle are the
same as they would be under ideal operating conditions.
● Ideally, the compression ratio for this cycle would be ?_ideal = 10.
● The specific volume at the end of the isobaric expansion is the same for the real cycle and the
idealized cycle.
● The temperature is measured to be 800 K after the adiabatic compression process.
● The cutoff ratio for the real cycle is ?_c = 2.5
● The adiabatic expansion produces 85% of the work it would produce if it were also reversible.
Treat air as having constant specific heats at 300 K during your analysis.
a) Sketch an ideal Diesel cycle on ?-? and ?-? diagrams. You do not need to specify any property
values on your diagrams. Using the ideal cycles for reference, sketch the non-ideal Diesel cycle
described above on the same axes. Again, you need not specify any property values; just focus
on getting the general trends correct.
b) Determine the isentropic efficiency of the compression process.
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