Abstract
This Dissertation Note describes practical tests on small vertical axis turbines using concentrating convergent nozzles. The nozzles amplify the wind-speed before the air contacts the blades. The purpose of the work relates to distributed power generation in regions with weak, mainly single-directional winds. Wind-tunnel tests of five different nozzle arrangements have been conducted. The length and outlet area of the nozzles were changed to see the effect on the increase of wind speed. The variation of the output wind-speed with different values of input wind speed, different input areas of nozzle and different lengths of nozzle have been recorded. The tests identify the optimum nozzle dimensions for improved performance of the system.
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