Abstract
Tests have been made in a wind tunnel on a number of Savonius rotor configurations in wind speeds of 6–9 m/s. The variables tested were blade aspect ratio, blade overlap and gap and the effects of adding end extensions, end plates and shielding. For low aspect ratios (∼1) with no additions the efficiency was low (∼0.065) but for higher aspect ratios (∼5) with optimum blade configuration and shielding a maximum value of efficiency of 0.25 was obtained. Tests with three and four bladed configurations gave appreciably lower values of efficiency. A special study was made of wind tunnel corrections for blockage ratios up to 0.3.
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