Multi-vane expanders: Geometry and vane kinematics

O. Badr, P.W. O'Callaghan and S.D. Probert

Applied Energy, 1985, vol. 19, issue 3, 159-182

Abstract: A multi-vane expander (MVE) offers considerable promise as a prime mover for organic Rankine-cycle engines utilising solar energy or waste heat to provide the power input.1 Therefore, mathematical models describing an expander's behaviour have been constructed; these models are applicable to a wide range of MVEs. For two existing designs, the geometrical characteristics and the vane kinematics have been evaluated using the computer sub-routines composed. The results indicate that the neglect of the vanes' thickness when evaluating the geometrical characteristics of the expanders can lead to considerable errors in their predicted volume expansion ratios, especially when numerous vanes and small inlet angles are employed. The expected effects of the geometrical parameters of the expanders on their performances are discussed.

Date: 1985
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