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Design and Performance of a Novel Spillway Turbine

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Document pages: 18 pages

Abstract: The high-speed supercritical flow in steeply sloped channels contains asignificant amount of hydro-kinetic energy. A novel,horizontal axis, spillway turbine as presented in this paper attempts toconvert that energy into electricity. We report on the turbine’s design andexperimental testing. Its intended use is in low-head, low-flow, manmade, concrete-lined channels such as chutes,spillways and other similar steeply sloped open-channels. The designlends itself from an impulse turbine runnerbut without a pipe or a nozzle. The spillway turbine consists of 2 maincomponents: 1) the runner and 2) an accelerator channel that directs the water towards the runner’sblades. The runner, once fitted with Pelton-inspired “cup inserts” showsperformance improvements both in terms of efficiency and specific speeds. Thespecific speed and the speed factors calculated confirm that this novelspillway turbine runner can be categorized as an impulse turbine. The maximumefficiency obtained during laboratory testing is43.4 and hence competes well with standard hydrokinetic turbines.

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