A method for predicting choking flow in centrifugal impellers is outlined in this paper. The theoretical development of the sonic flow equations for an ideal gas in an impeller passage is combined with empirical data through the derivation of a passage contraction ratio based upon test data. Construction of the three-dimensional passage throat area for two basic types of impellers is also outlined. Good correlation between experimental data and calculated choking flows for other centrifugal impellers is shown by the use of this method. Further utilization of this method for nonideal gases ranging in compressibility from 0.85 to 0.98 seems feasible if small errors can be tolerated.

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