Numerical analysis of a vortex controlled diffuser
- Spall, Robert E.
- Nov 1, 1993.
- Physical Description:
- 1 electronic document
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- A numerical study of a prototypical vortex controlled diffuser is performed. The basic diffuser geometry consists of a step expansion in a pipe of area ratio 2.25:1. The incompressible Reynolds averaged Navier-Stokes equations, employing the K-epsilon turbulence model, are solved. Results are presented for bleed rates ranging from 1 to 7 percent. Diffuser efficiencies in excess of 80 percent are obtained. Reattachment lengths are reduced by a factor of up to 3. These results are in qualitative agreement with previous experimental work. However, differences in some basic details of experimentally observed and the present numerically generated flowfields exist. The effect of swirl is also investigated.
- NASA Technical Reports Server (NTRS) Collection.
- Document ID: 19940019186., Accession ID: 94N23659., and NASA. Lewis Research Center, The Fifth Annual Thermal and Fluids Analysis Workshop; p 381-393.
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