Isentropic process for Ideal gas -air For the special case of air: D2 prexp 「s(T2)-s(T） Not linear Only f(T),marked as p.(T) exp[s(Tz)/R] Relative pressure P2 But not truly a pressure exp[s(T)/R PROPERTY TABLES AND CHARTS TABLE A-17 Ideal-gas properties of air T h U Pr2 K kJ/kg kJ/kg Vr kJ/kg.K (s S2,air only) 200 199.97 0.3363 142.56 1707.0 1.29559 210 209.97 0.3987 149.69 1512.0 1.34444 Pr 220 219.97 0.4690 156.82 1346.0 1.39105 230 230.02 0.5477 164.00 1205.0 1.43557 240 240.02 0.6355 171.13 1084.0 1.47824 250 250.05 0.7329 178.28 979.0 1.51917 where pri p(T1)and pr2 p(T2) 260 260.09 0.8405 185.45 887.8 1.55848 270 270.11 0.9590 192.60 808.0 1.59634 280 280.13 1.0889 199.75 738.0 1.63279 285 285.14 1.1584 203.33 706.1 1.65055 上泽通大学 April 27,2018 4 SHANGHAI JIAO TONG UNIVERSITYApril 27, 2018 4 Isentropic process for Ideal gas -air Only f(T), marked as pr (T) For the special case of air: Relative pressure But not truly a pressure Not linear