The rotating stall characteristics of several guide-vane - rotor and guide-vane-rotor - stator configurations were investigated. Guide vanes having turning angles of -22.5°, 0°, 22.5°, and 40° were used. The stage hub-tip ratio was 0.9.nResults indicate that the initial rotating stall point, number of stall zones formed, and stall propagation rate of a configuration depend not only upon blade-row inlet angle and pressure-rise characteristic, but also upon the over-all characteristics of the multiblade row unit as well. The addition of stators to a particular guide-vane - rotor con figuration generally increased the flow coefficient where rotating stall was initially encountered and lowered the stall propagation rate. The number of stall zones formed in the annulus did not appear to depend upon guide-vane turning or the presence' of stators.
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