Abstract
This paper deals with the effects of the diffuser radius ratio and diffuser width ratio on rotating stall in parallel walled vaneless diffusers. Equations for predicting initiation flow rate and rotational speed of cells presented in previous studies are examined using experimental data. The ratio of the radial length to the width of a diffuser affects the occurrence of rotating stall. Weak rotating stall occurs when this ratio is small. The reasons for this are discussed based on the results of previous studies. Predicted values of the rotational speed of cells agree well with measured values for the diffuser with a relatively large radius ratio. However, a small correction is required in the case of a small radius ratio.
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