(4).Rigid adiabatic nozzle P P. m2-r i t P2<PI Ci t2<t1 m2 Cf2>Cf c-velocity i-mass flow rate Red line system(gas)-Closed system Nozzle as system- Open,adiabatic system 上游充通大 February 28,2019 10 SHANGHAI JLAO TONG UNIVERSITYFebruary 28, 2019 10 Closed system (4)．Rigid adiabatic nozzle Red line system (gas) — Nozzle as system— Open, adiabatic system c – velocity m –mass flow rate