Community Research and Development Information Service - CORDIS

Contrarotating Wells turbine

An alternative system for a Wells turbine has been proposed which provides the advantages of using guide vanes with the ideal matching of the biplane type of design. In place of a fixed biplane rotor twin rotors are utilized which rotate in opposite directions. The result is that the second rotor extracts the majority of the swirl energy from the air flow and, in addition, because of the change in the angle of attack of the air between the 2 rotors the efficiency is increased and the onset of stall can be postponed on the downstream plane.

The preliminary work carried out on this form of the Wells Turbine has proved promising, the second rotor clearly extending the operating range of the turbine for different air flows. This has bee accompanied by a small increase in efficiency which was less than expected in the practical tests. It would be desirable to repeat the tests with a larger diameter rig where more accurate results could be obtained and where speed control of the rotors was available in order to obtain the characteristics over the complete range of behaviour.

Reported by

Queen's University of Belfast
BT7 1NN Belfast
United Kingdom
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