Abstract
Performance charts are included that enable appropriate initial choices (that is, before final design by methods of computational fluid dynamics) to be made of reaction and flow coefficient (or blade row outlet angle) for specified stage loadings in axial-flow turbines. The radial variation in vector diagrams that leads to acceptable radial distributions of reaction at various hub-shroud diameter ratios and loadings are discussed and plotted. From these, the ranges of design freedom to choose the annulus cross-section (for example constant o.d. or i.d.) are plotted as a function of turbine pressure ratio. Also developed is a method of correlating and adding losses that should be more consistent and thermodynamically more rigorous than some previously used methods.
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