A simple empirical method for calculating the total deviation in mixed flow impellers is proposed. Data are presented which show that the total deviation can be modelled by the superposition of a viscous deviation, related to the blade cascade performance, and an inviscid deviation, due to a secondary flow in the blade passages.
Measured values of total deviation are given together with details of the inviscid secondary flow model. The viscous deviation component is shown to be a function of the modified blade loading parameter used in the correlation of cascade data.
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