A method of determining overall cascade performance by means of torque measurements on a wheel with axial outlet is given. The method, which is believed to be new, is particularly suited for small axial turbines or compressors. It gives the overall performance in actual turbomachines and includes all losses. The method is simpler and gives more accurate results than the elaborate method of traversing, for instance, in small axial turbomachines with blade height below 0.1 inch. A one dimensional analysis is given and applied to two known flow conditions in order to obtain a comparison with other ways of evaluating these flow conditions. The relationship between cascade efficiencies defined in different ways is shown, and an illustrative example is given.

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