Unsteady swirling flows in annular cascades, Part 2: Aerodynamic blade response

A model is developed for the interaction of unsteady incident disturbance i n a swirling mean motion with an annular cascade of unloaded blades. The in cident disturbances are modeled by using a combined eigenmode analysis with initial-value problem solutions as described elsewhere (Golubev, V.V., and Atassi, H, M,, "Unsteady Swirling Flows in Annular Cascades, Part 1: Evolu tion of Incident Disturbances," AIAA Journal, Vol. 38, No. ?, 2000, pp, 114 2-1149), The scattered field is calculated in response to the blade upwash and accounts for the effects of the centrifugal and Coriolis forces induced by the mean swirl. Benchmark results are presented for the unsteady blade pressure in the rotor-wake/stator interaction problem. These results are co mpared with the strip theory and show strong dependence on the swirl-induce d changes in the radial distribution and axial evolution of the incident vo rtical disturbances.