Abstract
This report deals with the problem of the optimum blading such as designing the profiles and bladings in turbine cascade to minimize the blade loss for various loading conditions. For this purpose forty cases of cascades, different in blade arrangement and inlet and outlet flow conditions, were examined with the aid of boundary layer theory. The parameters for the optimum blading were the frictional loss coefficient, diffusion factor of the upper surface, pitch-chord ratio and the value of maximum velocity and its location. As a result, some conditions necessary for the optimum blading were made clear, and a new parameter representing the loss coefficient was introduced. Furthermore, the agreement of these results about the optimum pitch-chord ratio with those of conventional methods was fairly good.
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