Air Standard Cycles Air standard cycles are idealized cycles based on the following approximations: >A fixed amount of air modeled as an ideal gas is the working fluid. >The combustion process is replaced by a heat transfer from an external source. >There are no exhaust and intake processes as in an actual engine. The cycle is completed by a constant-volume heat transfer process taking place while the piston is at the bottom dead center position. >All processes are internally reversible. Cold air-standard analysis >The specific heats are assumed constant at their ambient temperature values. 上游充通大率 May15,2018 3 SHANGHAI BAO TONG LINIERSITYMay 15, 2018 3 Air Standard Cycles Air standard cycles are idealized cycles based on the following approximations: A fixed amount of air modeled as an ideal gas is the working fluid. The combustion process is replaced by a heat transfer from an external source. There are no exhaust and intake processes as in an actual engine. The cycle is completed by a constant ‐volume heat transfer process taking place while the piston is at the bottom dead center position. All processes are internally reversible. Cold air ‐standard analysis The specific heats are assumed constant at their ambient temperature values