The following information pertains to an inward flow reaction turbine:
Output = 500 h.p.; Speed = 750 r.p.m.;
Head = 70m. Axial length of blade at inlet = 0.1 x wheel diameter at inlet; ratio of outer and inner diameters = 0.5: flow ratio = 0.17; hydraulic efficiency = 92%;
Overall efficiency = 84%.
Assume radial discharge, constant velocity of flow throughout and area blocked by blade thickness as 5% of area of flow.
Determine
(i) diameters at inlet and outlet,
(ii) width of wheel at inlet and outlet,
(iii) Guide blade angle,
(iv) vane angles at inlet and outlet.