In: Other
The cycle involved in the operation of an internal combustion
engine is called the Otto cycle....
- The cycle involved in the operation of an internal combustion
engine is called the Otto cycle. Air can be considered to be the
working gas and assumed perfect. The cycle consists of the
following steps.
- reversible adiabatic compression from A to B
- reversible constant volume pressure increase from B to C (from
the fuel combustion)
- reversible adiabatic expansion from C to D
- reversible constant volume pressure decrease from D to A
Determine an expression for the
efficiency of this engine assuming that heat is supplied in step
ii). Then evaluate the efficiency for a compression ratio of 10:1.
Assume that the ratio of the volumes defines the compression ratio
and that state A is defined by V = 4.00 L, P =
1.00 atm, and T = 300 K. Further, let VA =
10·VB, PC/PB = 5, and
Cp,m = (7/2)R. Finally, calculate the entropy change for
system and surroundings for each step in the cycle.