Question

Q1/ Centrifugal pump runs at (1200 r.p.m) and the velocity of flow through the impeller is constant (4 m/s). It works with total head of (32m). The vanes are set back at an angle of (30°) at outlet .The outer diameter of the impeller is (600 mm) while the width of outlet is (50mm). Determine 1) work done per second by impeller 2) Vane angle at inlet 3)discharge 4)efficiency

Answer 1

To find te work done, efficiency, inlet vane angle and discharge; we shall start by calculating the blade velocities u_1 and u_2 at inner and outer diameteres. Since the inner diameter isn't provided, we will use the general co-relation with outer diameter. Please refer to the attached images for solution of given problem and do comment in case of any query. All the best!!