Axial and Radial Turbines for Gases

Abstract

Fundamentals of axial turbines were discussed in the chapter on steam turbines (Chap. 6). Turbine parts in gas turbines follow the same principles. When analysing the performance of axial turbines, we assumed, by way of a simplification, a given stator outflow angle (α₁ = 72º and 75º). The analysis is generalised here and completed with a discussion of blade design and operating characteristics. The fundamental theory of radial turbines was treated in the chapter on hydraulic turbines (Chap. 9). The specific aspects for a compressible fluid are discussed in the present chapter. In particular, the rotor has an exducer part. Operating characteristics of radial turbines are derived. The chapter concludes with the non-dimensional form of the operating characteristics of turbomachines with a compressible fluid.