VORTEX SHEDDING IN COMPRESSOR BLADE WAKES.

This paper reviews the work on wake structure at MIT, presents the results of a viscous numerical simulation, compares the blade wake vortices to those shed from a cylinder, and discusses the implications of the wake structure on compressor performance. In particular, a two-dimensional, time accurate, viscous calculation shows both a periodic wake structure and time variations in the passage shock strength. The numerical calculations are compared to laser anemometer and high frequency response probe data. The effect of the wake structure on the entropy production and apparent adiabatic efficiency of the compressor rotor is discussed.