Flow Visualization, Surface Pressure and Velocity Measurements on a Cylindrical Surface with a Bump
Paper in proceeding, 2006

A cylindrical bump with a spherical free end has been mounted on a cylindrical surface, and flow visualization, surface pressure measurements and the turbulent velocity statistics measurements were performed. The thickness of the turbulent boundary layer was thinner than the bump height at the position of the bump. Slenderness parameter (H/D) of the bump was 1. This setup was a prototype of a typical wall-mounted sensor on aircrafts, therefore it has practical importance. Analysis of the experimental data shows that thickness of the turbulent boundary layer controls the location of separation over the bump. Spherical ending of the bump delays the separation, especially from half height of the bump to the top of the bump. It also affects the strength of trailing vortices created at the free end of the bump, and hence size of the separated region. The thickness of the horseshoe vortices are directly related to the freestream velocity. The curvature of the ground plate does not have significant effect for far downstream positions.


Murat Tutkun

Chalmers, Applied Mechanics, Fluid Dynamics

Peter Johansson

Chalmers, Applied Mechanics, Fluid Dynamics

B. Anders Pettersson-Reif

Chalmers, Applied Mechanics, Fluid Dynamics

25th AIAA Aerodynamic Measurement Technology and Ground Testing Conference; San Francisco, CA; United States; 5 June 2006 through 8 June 2006

Vol. 1 343-357
978-156347811-6 (ISBN)

Subject Categories

Fluid Mechanics and Acoustics





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