The transonic area rule as proposed by R. T. Whitcomb (1952) has been successfully applied to external flow since that time. This paper reports a preliminary semi-empirical study done in the early 1980’s to determine if a specific area ruling concept can be applied to internal flows, in particular to transonic fans using part-span dampers (i.e., part-span shrouds). Cascade and rotor correlations reported herein indicate that the area rule may be applied to internal flows. A simple precursory channel flow experiment has been done that shows an attenuation of shock losses using area ruling in supercritical internal flow.

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