流动角阝2 后弯叶片：B,<90° ctgβ2>0 1W2 8 2 径向叶片：B,=90° ctgβ2=0 前弯叶片：B2>90° ctgB,0 818 g u ctg HT 2 2 2 0 后弯叶片： 2  90   0   流动角 2 g u ctg HT 2 2 2 0 径向叶片： 2 = 90  = 0  = g u ctg HT 2 2 2 0 前弯叶片： 2  90   0  