Abstract
It is proposed that the mean total head loss, as a measure of loss in cascade tests, should be based on the mean total head far downstream, where mixing of wake with surrounding flow is completed. The exact formula of computing the mean total head loss from the data of total head traverse of a wake is derived allowing the effects of compressibility, together with the approximate one which eliminates labor of computations to the minimum. The mean total head loss computed by the present formula gives a constant value irrespective of the distance of the plane of traverse from the trailing edge of a blade as shown in Fig.6. It is also confirmed that the relation between the momentum loss and the loss in the axial component of force acting on a blade is same in compressible flow as in incompressible flow.
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