11. Gas exits the stationary turbine nozzle guide vanes at absolute velocity " V " a1. 12. In all probability, the downstream LP turbine nozzle guide vanes would have to be changed anyway. 13. For such axial-flow compressors, consider a set of guide vanes with an approach velocity c1. 14. The power turbine was a seven-stage ( initially 6-stage ) turbine plus inlet and outlet guide vanes . 15. Intermeshed contra-rotating turbines can act as the guide vanes for each other, removing the need for static vanes. 16. Unlike some military engines, modern civil turbofans do not have any stationary inlet guide vanes in front of the fan rotor. 17. The turbine was also unique for the era, using a set of guide vanes that were adjustable for various operating speeds. 18. If the deflection angle, e, between the guide vanes is small, the magnitude of the secondary vorticity is represented as 19. The engine had variable inlet guide vanes , as used on many other engines, necessary for accelerating from idle to high thrust. 20. This system changes the angle of the guide vanes depending on the exhaust pressure, giving the system excellent power throughout the rev range.
