Up: PHYSICS OF AIRFOIL
A third-order accurate, upwind-biased, thin-layer
Navier-Stokes zonal code (STAGE-2) has been used to investigate stator
clocking in a multistage compressor. The effects of stator clocking on
the unsteady flow within a low-speed þstage compressor have been
investigated. The results indicate that clocking in multistage
compressors is a complex, non-linear phenomenon which warrants further
study. In particular,
- Variations in efficiency, force amplitudes and frequencies
are functions of the relative position of the clocked airfoil
and convected wake groupings.
- The optimal combination of high efficiency and low force amplitude
occured when the stator-1 wake convected along the pressure
surface of stator-2.
- A slight movement of the stator-1 wake to the suction surface of
stator-2 resulted in a distinct loss in efficiency
and higher amplitude unsteadiness.
- When performing parametric studies of airfoil
clocking, one must be careful in choosing the parameter
variation in order not to overlook these effects.
Karen L. Gundy-Burlet
Wed Apr 9 15:39:35 PDT 1997