A Simple Method to Estimate Blade Surface Pressure in Axial-Flow Turbomachines and Its Application

概要

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A simple method is proposed to estimate the surface pressure distribution on a cascade airfoil in the retarded flow, is compared with theoretical and experimental results, and is discussed in detail. It is verified that the method is applicable to the design of axial-flow turbomachines considering the suction performance and efficiency. There are two assumptions in this procedure: The first; the flow velocity on the surface may be obtained by superposition of the velocity on an isolated airfoil and the additional velocity induced by the cascade effect. The second; the induced velocity has a tangential component which decreases linearly along the chord line. As an application, it is shown that a turbo-pump should be designed as follows, that is, a rather small flow coefficient when optimization of both suction performance and efficiency is desirable.
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