Calculation of Local Power Consumptions and Efficiencies of Centrifugal Fans and Turbocompressors

摘要

A theoretical study is presented of calculation methods for determining local power consumptions and efficiencies of radial fans and turbocompressors. The use of the angular momentum equation, Euler's method, and the use of the stress tensor method are analyzed. A modified formula for Euler's method is derived, which is accurate for viscous flows. A new local efficiency concept is introduced, by which the performance can be evaluated in different parts of the impeller. A representative numerical example of the use of the theory is presented.