University of Minnesota
Aerospace Engineering and Mechanics
Fall 2001 Seminar Series
Minor Losses in Oscillating Flow
Energy dissipation that is manifest by gradients in pressure in a flow
system is often expressed in terms of a pressure loss factor. While there is a
wealth of data on loss factors for a myriad of geometries in steady flow, few
such data exist for pulsatile or oscillatory flow. Recent advances in
thermoacoustics motivate work in this area. An oscillatory flow system has been
constructed to investigate loss factors in 2-D geometries. The current results
provide loss factors of entrances/sudden expansions. It is found that the
losses are primarily a function of the displacement amplitude. The results also
provide information on the variation of the "equivalent length" with
the same parameter, and on turbulent disipation for this geometry. Oscillating
flow in diffusers is also investigated, with emphasis on loss factors as a
function of diffuser angle, and unsteady separation effects.
Friday, October 12, 2001
Refreshments served after the seminar in
227 Akerman Hall.
Disability accomodations provided upon request.
Contact Kristal Belisle, Senior