Analysis of flow losses and how to reduce them
Compressible fluid turbines - Losses and how to reduce them

In this paragraph, we'll look at losses, which take the form of an increase in entropy, and which are involved in efficiency (BM 4,560 § 2) through the retardation coefficients ϕ and ψ. Beforehand, we'll give some clarification on the exit angles α ₁ or β ₂ , which we considered in our discussion of efficiency to be fixed solely by the blade grid geometry.