Air standard cycles employs air as the working fluid assuming air to behave as a perfect gas.
Types of air cycles are.
- Carnot Cycle
- Otto Cycle
- Diesel Cycle
Carnot Cycle:
Carnot cycle consists of four operations.
- Isothermal expansion
- Adiabatic expansion
- Isothermal compression
- Adiabatic compression
Otto Cycle:
Otto cycle is additionally referred to as constant volume cycle. In this Otto cycle four operations are there.
- Adiabatic compression
- Addition of heat at constant volume
- Adiabatic expansion
- Rejection of heat at constant volume
- 1 – 2 = Adiabatic compression
- 2 – 3 = Addition of heat
- 3 – 4 = Adiabatic expansion
- 4 – 1 = Rejection of heat
Diesel cycle:
Diesel cycle is additionally referred to as constant pressure cycle. The diesel cycle consist of
- 1 – 2 = Adiabatic compression
- 2 – 3 = Addition of heating at constant pressure
- 3 – 4 = Adiabatic expansion
- 4 – 1 = Rejection of heat