Question

7. The Francis turbine shown in the Figure is rotating at 75 rpm under a hydraulic head of 30ft and develops 150 hp with a discharge of Page 1 HW #8 ENSC 32 33 FLUID MECHANICS 0.1m/s. When the guide vanes remain in their fixed position and the hydraulic head is 15ft, determine (i) the rotation of this turbine and (ii) the corresponding discharge and power of the turbine. (Hint: Lecture Notes)

Answer 1

- Givew francis Turbine At Head of 30 ft At n;30ft, initial speed N = 750 rpm. :75 rpm Power developed P, = 150 hp Dischaye Q = 0.1 m/s When Guide semain fixed aulic head changed to is ft To determine (i) The Rotation Turbine 2 at th: 15 ft vanus and hydraulic of As remain same N Unit spud will Nya 잘 un 75 Ny Vs JH2 30 N 53.033 rpm 2 () Discharge at Hydraulic Head of h: 15.ft Unit discharge will remain same Qu Oz Qi 0.) 02 V30 کرد Discharge Q 0.0007 wsts CS Scanned with CamScanner

is it ( power at Mydraulic Head his Onit power will remain same Pu: P 4/2 -) P2 믕 13/2 43/2 2 150 P2 (159312 (30)/2 $3.033 hp Power developed : 53.033 hp Iz CS Scanned with CamScanner