Abstract
Demand of the power is increasing day by day with the development of the science and technology. Development of the renewable energy sector has become essential issue at the present situation due to the limited source of the non-renewable energy. Hydro energy power generation sector is superior over the other renewable sector due to the high efficiency, ability to continuous generation and low generation cost. In India a great amount of the power generation is taken care by the hydro power system but still some more potential have unexplored. The efficiency improvement of the hydro turbine system can be done for the new installation or installed system by the improvement in component level. The system can be installed by the state of the art equipment, like modern inlet guide vane (IGV) control system, improved design of the runner, IGV system, draft tube, penstock to reduce the loss, hence improve the efficiency. The energy recovery in the draft tube depends on the design of draft tube. In the present work the optimized design of the draft tube shape through computational fluid dynamics (CFD) simulation has been carried out in ANSYS FLUENT platform. The design objective of the draft tube is to reduce the flow loss and improve the energy recovery, hence to improve the efficiency.
Highlights
Demand of the power is increasing day by day with the development of the science and technology
Hydro energy power generation sector is superior over the other renewable sector due to the high efficiency, ability to continuous generation and low generation cost
The system can be installed by the state of the art equipment, like modern inlet guide vane (IGV) control system, improved design of the runner, IGV system, draft tube, penstock to reduce the loss, improve the efficiency
Summary
Demand of the power is increasing day by day with the development of the science and technology. The main functions of draft tube is to allow the installation of turbine above the tail race level without loss of head and to convert major part of kinetic energy at the runner outlet into pressure energy. The use of very low head and high speed turbines, the kinetic energy leaving the runner became higher and the height of the runner above the tail race became smaller This is achieved increasing the cross-sectional area of the draft tube in the flow direction. The bell mouth tube can be use for the recovery of the axial and the radial flow machines but the use of those types of draft tubes for large runner diameters has again restriction Where K is the draft tube efficiency and the 'Pr is the pressure recovery
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