现有一台蜗壳式离心泵,转速 n =1450r/min , q vT =0.09m 3 /s , D 2 =400mm , D 1 =140mm , b 2 =20mm , β 2a =25 o , z=7 , v 1u∞ =0 ,画出出口速度三角形, 计算无限多叶片叶轮的理论扬程 H T∞ (不计叶片厚度的影响)。
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