The Effect of Periodic Errors in Blade Setting on the Potential Incompressible Flow in Compressor Cascades

An analysis is given for the potential incompressible flow through compressor cascades with periodic one-blade setting errors. The effects of three components of errors (chord-wise, cascadewise, and angular) on the cascade performance are predicted. It is shown that setting errors can produce substantial changes in the aerodynamic parameters of a given cascade. However, the cascade performance appears to be more sensitive to angular errors than it is to other types of error. The analysis, which is essentially a modified Schlichting approach, leads to “influence coefficients” that may be used to predict the effect of a periodic setting error in more than one blade on the loading of any of the cascade blades.