CASCADE TESTS OF THE BLADING OF A HIGH-DEFLECTION, SINGLE-STAGE, AXIAL-FLOW IMPULSE TURBINE AND COMPARISON OF RESULTS WITH ACTUAL PERFORMANCE DATA,

Cascade tests were performed on models of the stator nozzles and rotor blade rows of a high deflection, single-stage, axial-flow impulse turbine. The results of these tests were compared with the performance data of the actual turbine. The comparison showed that profile and mixing losses, though not negligible, constitute only a small percentage of the overall rotor loss. Also, the inlet flow angle at which the minimum loss occurred for the Cascade flow was significantly different from the inlet flow angle at which minimum actual rotor loss occurred.