Suscripción a Biblioteca: Guest
Seventh International Symposium on Turbulence and Shear Flow Phenomena
July, 28-31, 2011, Ottawa Convention Centre, Ottawa, Canada

DOI: 10.1615/TSFP7

THE EFFECT OF INLET DISTORTION ON 3D ANNULAR DIFFUSERS

pages 1-6
DOI: 10.1615/TSFP7.1560
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SINOPSIS

The effect of upstream flow distortion on the performance of practical annular diffusers was examined in order to gain insight on how to design a more robust diffuser. Experiments were conducted in one-fifth sectors of an annular diffuser with a single NACA 0015 airfoil shaped support strut in the center. Three diffusers with different expansion ratios ranging from conservative to aggressive and four inlet conditions were investigated. Magnetic resonance velocimetry was used to measure all three components of time averaged velocity over the entire flow field. The conservative diffuser design was robust in that it did not stall for any of the various inlet conditions. However, there were substantial variations in the flow development. The moderate diffuser stalled for one of the inlet conditions, and the aggressive diffuser stalled for all inlet conditions investigated. The development of the boundary layer along the diffusing wall and the separated wake of the support strut were both very sensitive to varying inlet conditions.

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