Abstract
A general fromula of an efficiency of radial-flow gas turbine, including the rotationary loss was introduced by adopting three parameters-the flow factor, the ratio of radial components of absolute velocities at the inlet and the outlet of the impeller and the ratio of the inner and the outer diameters. When the angle of the impeller at the outlet was given or the absolute velocity at the outlet of the impeller was radially directed, the relations at the optimum and the maximum efficiency were given. The characteristics of radial-flow gas turbine, when the ratio of the inner and the outer diameters was 0.6, were shown, the effect of the rotationary loss was discussed and the case when the absolute velocity at the outlet of the impeller was radially directed, was proved to be not optimum. Then a radialflow gas turbine for supercharging a diesel-engine was designed and the velocity diagram was shown with the dimensions of its impeller.
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