Abstract
This paper dials with the effect of a diffuser radius ratio (exit radius/inlet radius) on the predicting equations, that is, the equations of a critical inlet flow angle for the onset of a diffuser rotating stall and of rotational speeds of stall cells. The main results in this study are as follows : A measured critical inlet flow angle for the diffuser with the largest radius ratio is the largest in this experiment and it is close to a predicted value. A non-dimensional form of a rotational speed of cells used in this paper proves to be valid for the diffusers with radius ratio smaller than 2.35. The predicting equations of rotational speeds of cells are available over wide ranges of a non-dimensional width and of a diffuser radius ratio. The predicting method of rotational speeds of cells presented in this paper is very simple ; nevertheless, predicted values agree well with measured values.
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