Numerical analysis of rotating stall characteristics in vaneless diffuser with large width-radius ratio

Abstract

A two-dimensional model, where the influence of wall boundary layers is neglected and inlet jet-wake velocity patterns are prescribed, was applied to simulate one vaneless diffuser with a large width-radius ratio. The impact of diffuser length, impeller blade number, etc. on the rotating stall was analyzed. Computational results show that a different mechanism does exist for diffusers with large width-radius ratios. Comparison with related conclusions and references is supportive of the model.

Keywords

vaneless diffuser / rotating stall / large width-radius ratio / jet-wake