Abstract
The pressure field on the ground plane around three-dimensional bluff bodies with varying relative dimensions has been obtained experimentally. The pressure measurements along the plane of symmetry are presented for the cases when the bodies are exposed to a uniform approach flow (without the presence of a horse-shoe vortex) and when the bodies are kept in a boundary layer. The results show extreme base suction for a body with a relative length to width ratio (l/b) of 0.5. A horse-shoe vortex exists at the front end for the bodies kept in the boundary layer. The isobaric coefficient contours presented for the region away from the plane of symmetry clearly indicate the regions of suction pressure around the bodies and how they vary with the relative dimensions. The vortex system at the front end is also revealed by the isobars.
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Abbreviations
- b :
-
width of the body
- C PW :
-
(p−p r)/1/2ρU 2r , pressure coefficient on the ground
- h :
-
height of the body
- l :
-
length of the body along the flow direction
- p :
-
pressure at any point on the surface plate with the body
- p r :
-
pressure at the same point on surface plate without the body
- U r :
-
free stream reference velocity
- x :
-
coordinate along the flow direction
- x r :
-
reattachment distance
- z :
-
coordinate normal to x and in the plane of the ground
- δ :
-
boundary layer thickness
- δ*:
-
displacement boundary layer thickness
- (-):
-
( )/b
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Gowda, B.H.L., Gerhardt, H.J. & Kramer, C. Pressure field around three-dimensional bluff bodies. Appl. Sci. Res. 42, 245–263 (1985). https://doi.org/10.1007/BF00539343
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DOI: https://doi.org/10.1007/BF00539343