2分析 = 0.5 Typical pressure ratios for gas- a)z个n,↑m与无关?0 turbine engines 0. Pressure ratio b)丌-定q个wm个m不变9 2.分析 a)   t  t 与T3 无关 1 net ) t b q w   一定 不变   1 2 1 1 1 1 t T T     − = − = − ？