Stresses in Centrifugal Fan Impellers

Abstract

The conventional, theoretical method for estimating impeller stresses combined with large factors of safety is unsatisfactory for the design of the high-pressure fans being demanded today.

For economic design, a more precise knowledge of the stresses involved in high-speed impellers is essential and this has been made possible by the considerable developments which have taken place over recent years in the field of strain measurement.

This paper describes an experimental programme of stress analysis using brittle-lacquer and strain-gauge techniques, carried out on a range of centrifugal fan impellers. The actual stresses in the various components of these impellers are compared with those predicted by elementary theory.

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