Scaling parameters for a time-averaged separation bubble
Abstract
A splitter plate is placed in the wake of a two-dimensional bluff body. The splitter plate is long enough for the separated flow behind the body to reattach on the splitter plate. The time-averaged properties of this 'closed' separation bubble are investigated under a wide range of kinematic conditions. It is found that blockage reduces the base pressure coefficient (C sub pb) and the distance to reattachment (l) but the relationship between l and C sub pb is not obvious. The pressure distribution in the separated zone, scaled on C sub pb and l, can be described by a universal curve. The usefulness of a slotted wall in reducing blockage effects on bluff body flows is shown to be limited in that the wall porosity affects only some properties of the separation bubble.
- Publication:
-
ASME Journal of Fluids Engineering
- Pub Date:
- June 1982
- Bibcode:
- 1982ATJFE.104..178S
- Keywords:
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- Bluff Bodies;
- Cavitation Flow;
- Reattached Flow;
- Separated Flow;
- Base Pressure;
- Blocking;
- Porous Walls;
- Pressure Distribution;
- Splitting;
- Wind Tunnel Tests;
- Fluid Mechanics and Heat Transfer