Effects of a centerbody on an axisymmetric flow through a sudden expansion

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:5648791

Devenport, W J; Sutton, E P ^[1]

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1. Cambridge, University, England (United States)

Flow through an axisymmetric sudden expansion of a pipe with and without a centerbody is studied using measurements of velocity, pressure, and skin friction. Without the centerbody, a turbulent shear layer is formed by the separation of the flow at the expansion. The layer is founded on one side by a potential core and on the other by a region of turbulent recirculation. Mean-velocity profiles in the shear layer are initially similar to those of an axisymmetric jet mixing layer. Turbulence levels are however, much higher and the growth rate of vorticity thickness much lower. Reattachment of the shear layer is gradual and occurs over a large streamwise distance. Introducing the centerbody deflects the flow toward the pipe wall causing reattachment much earlier. The curvature of the dividing streamline is correspondingly increased, as is the angle at which it meets the wall. Initial development of the shear layer is similar to that in the datum flow. Peak turbulence levels and vorticity thickness reach a maximum and then fall in the region of maximum curvature. Turbulence levels then rise again in the reattachment region. 35 refs.

• OSTI ID: 5648791
• Report Number(s): AIAA-Paper--92-0431; CONF-920157--
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
EXPANSION
FLUID FLOW
FLUID MECHANICS
FRICTION
MECHANICS
PIPES
PRESSURE MEASUREMENT
SHEAR
STAGNATION
TURBULENT FLOW
VELOCITY