Table of contents |
|
Hydraulic Turbines |
|
1 Crore+ students have signed up on EduRev. Have you? |
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 |
Turbine Head |
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.
6 videos|97 docs|55 tests
|
6 videos|97 docs|55 tests
|