Gas Turbine Handbook : Principles and Practices

58 Gas Turbine Handbook: Principles and Practices
Figure 4-8. Rotating stall.
ρ, and the change in velocity. From the velocity triangles the pressure
rise per stage is determined.
ÄP =
ρ W 2
2g 1 – W 2 2 + ρ C 2 2
c 2g 2 – C 3
c
(4-19)
This expression can be further simplified by combining the differential
pressure and density, and referring to feet of head.
Head = Ç g c
ÄC = ÄP ρ (4-20)
where ÄP ρ is the pressure rise across the stage and Head is the pressure
rise of the stage measured in feet head of the flowing fluid. The
standard equation for compressor head is given below.