Gas Turbine Handbook : Principles and Practices

Gas Turbine Systems Theory 59
Figure 4-9. Velocity diagrams for an axial flow compressor.
Head = Z aveT s
MW
R c σ –1
σ
(4-21)
where Z ave
is the average compressibility factor of air, and MW is the
mole weight.
Before proceeding further, we will define the elements of an airfoil
(Figure 4-10).
Fixed Blade Row
Moving Blade Row
Camber Line
Camber or Blade Angle ≡ β 2
– β 1
Inlet Blade Angle ≡ β 1
Exit Blade Angle ≡ β 2
Inlet Flow Angle ≡ β 1
'
Exit flow angle ≡ β 2
'