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Layout of a hydroelectric power plant
Classification of Turbines on the basis of energy at inlet
Classification of Turbines on the basis of type of flow within turbine
Turbine Specific Speed (MKS Unit)
Pelton Turbine 10 to 35 Francis Turbine 60 to 300 Kaplan & Propeller Turbine 300 to 1000
Pelton Turbine above 250 m Francis Turbine 60 m to 250 m Kaplan & Propeller Turbine Below 60 m
Efficiency of Pelton wheel
(i) Nozzle efficiency
(ii) Hydraulic efficiency
(iii) Mechanical efficiency
(iv) Overall efficiency
ho = hN × hh × hmech
Purpose of draft tube
(i) Permits the negative suction head to establish at the runner exit
(ii) It acts as a recuperator of pressure energy.
The angle of straight divergent type draft tube should not be more than 8° otherwise eddies will be formed & efficiency will be reduced.
V & V are whirl velocities at inlet and outlet u1 & u2 are peripheral velocities of blades at inlet and outlet.
(iii) co-relation and use of experimental data.