A method is outlined for computing the characteristic values, such as pressure coefficient and efficiency of centrifugal compressors and radial inward-flow turbines, as function of Reynolds number and Mach number, whereby the latter values are defined in such a manner as to represent the weight flow and the pressure ratio of the turbomachine. The influence of blade number, blade angle, speed and diameter ratio of the impeller on the efficiency and pressure coefficient is discussed. The application of this method for computing the characteristic of a particular turbomachine is shown.

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