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The basic aerodynamic design principles for variable power turbines using variable vanes are derived. Optimum performance and efficiency require a proper match between the impeller, the vane system, and the volute. A typical design is described, with drawings. Experimental data showing corrected flow, expansion ratio, and efficiency for the design at several vane settings are presented.

The effects of Reynolds Number and contour clearance on centrifugal compressor efficiency are considered based on experimental data and an analytical model. Results allow a usefully accurate estimation of the effects of variation of these parameters.