Vortex Shedding in Compressor Blade Wakes,
MASSACHUSETTS INST OF TECH CAMBRIDGE GAS TURBINE LAB
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The wakes of highly loaded axial compressor blades have often been considered to be turbulent, unstructured flows. Recent work has suggested that the blade wakes are in fact dominated by a vortex street-like structure. This paper reviews the work on wake structure at MIT, presents the results of a viscous numerical simulation, compares 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.
- Fluid Mechanics