19-01-2013, 03:02 PM
WATER TURBINE
WATER TURBINE.pptx (Size: 569.99 KB / Downloads: 36)
INTRODUCTION
A water turbine is a rotary engine that takes energy from moving water.
HISTORY
Water turbines were developed in the 19th century and were widely used for industrial power prior to electrical grids. Now they are mostly used for electric power generation.
Water wheels have been used for thousands of years for industrial power. Their main shortcoming is size, which limits the flow rate and head that can be harnessed
THEORY OF OPERATION
Flowing water is directed on to the blades of a turbine runner, creating a force on the blades. Since the runner is spinning, the force acts through a distance . In this way, energy is transferred from the water flow to the turbine
ENVIRONMENTAL IMPACT
Historically there have also been negative consequences, mostly associated with the dams normally required for power production. Dams alter the natural ecology of rivers, potentially killing fish, stopping migrations, and disrupting peoples' livelihoods
Some people believe that it is possible to construct hydropower systems that divert fish and other organisms away from turbine intakes without significant damage or loss of power; historical performance of diversion structures have been poor.