The effects of system rotation on separation, reattachment and performance in two-dimensional diffusers
Abstract
The effects of coriolis acceleration on flow in two dimensional diffusers of rectangular cross section are considered. Two basic diffuser geometries were used in these water flow experiments. First, stall patterns were observed and wall pressures measured in a high aspect ratio diffuser having a faired throat which could be flexed to permit continuous variation of area ratio at fixed nondimensional wall length. Then shear layer mixing and reattachment were studied in a long, abrupt diffuser having fixed area ratio and discreetly varied aspect ratios. System rotation altered gross flow patterns in the fair diffuser and enhanced the tendency to stall. In the abrupt diffuser, the through flow separated at the edge of the step and formed a thin shear layer interface. Depending on direction of rotation, system rotation stabilized or destabilized this free shear layer.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- December 1975
- Bibcode:
- 1975PhDT........35R
- Keywords:
-
- Coriolis Effect;
- Diffusers;
- Flow Stability;
- Water Flow;
- Reattached Flow;
- Separated Flow;
- Shear Layers;
- Two Dimensional Flow;
- Fluid Mechanics and Heat Transfer