Unlike most water turbines which have axial or radial flows, in a cross-flow turbine, water passes through the turbine transversely or across the turbine blades. As with a water wheel, the water is admitted at the turbine’s edge. After passing the runner, it leaves on the opposite side. Going through the runner twice provides additional efficiency. When the water leaves the runner, it also helps clean the runner of small debris and pollution. The cross-flow turbine is a low-speed machine that is well suited for locations with low head.
Scotthydroelectric1
Advantages of Cross Flow turbinesÂ
Designed & Manufactured for years of maintenance free service
System runs 24/7—365 days a year in all weather conditions
Turbine housing constructed of heat treated aluminum with powder coated finish
Entire assembly made out of non-corrosive material
Bearings are double sealed permanently lubed stainless steel
The runner, shaft and fasteners are made from 300 series
stainless steel
Alternator is (permanent magnet) 3-phase AC direct drive with no gear box—increases reliability
High voltage AC output for long line transmission capability
3-phase rectifier changes AC to DC for battery charging
Generator is rated at 1500 watts output, and capable of up to 2000 watts depending on installation conditions
New SKF “Solid Oil” Long Life, Low Maintenance Bearings
Scott hydroturbine testing station
Low Head Hydropower
Mostly used in Mini and Micro Hydropower production
Ideal for low head conditions as low as 20 feet of vertical drop
The flat efficiency curve yields better annual performance than other turbine systems
Excellent behavior with partial load or low stream flow
Well suited for unattended electricity production
Its construction makes it easier to maintain than other turbine types
There are only three rotating components
Almost no turbine noise
Self cleaning. No runner cleaning is necessary
No dam required-simple diversion up stream or any water source meeting requirements