Abstract
Although Romania has a consistent hydro energetic potential, till now is valuated just approximate 30 percent of it. On the big rivers there are already installed high power hydro plants, but a lot of small and medium rivers are not valuated energetically. Installing a new high power hydro plant tends to affect the zone, being necessary a lot of changes in the environment. The Cross-Flow hydraulic turbines don�t need very complex hydro settlements, being very suitable for small and medium power hydro plants. Also a quite big potential in the use this type of hydraulic machines is the energy recovery in the water treatment and sewage plants. The turbine�s blades surfaces enters in contact with the pressurized water jet. The water jet creates a hydrodynamic force that tends to stress the blade. Mainly the Cross-flow turbine blades are made from steel. This article presents the hydrodynamic design and the possibility of using new polymeric material Delrin �AF for the Cross-Flow turbine runner blades, together with the stress analysis.
Highlights
Romania has a consistent hydro energetic potential, till now is valuated just approximate 30 percent of it
This paper presents the hydro-dynamic blade design and a study from strength of materials point of view of some suitable polymeric materials class for the turbine blades
The analytical knowledge of the geometry is useful for the future analysis of the blade behavior
Summary
Romania has a consistent hydro energetic potential, till now is valuated just approximate 30 percent of it. The Cross-Flow water turbine [1-5] is an action type turbine, having a cylindrical runner mainly, composed from two discs and curved blades flushed in a cylindrical ring. The water which gets out from the nozzle, passes through the runner blades two times, giving 2/3 of the hydraulic energy at the first passing and 1/3 on the second one. The Cross-Flow turbine blades are circle arcs with constant width.
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