Hydrodynamic Performance of a Surfboard Fin

The performance of a generic surfboard fin is investigated in a cavitation tunnel to gain basic understanding of the viscous flows involved for future systematic experimental and computational studies. Measurements of lift and drag forces, pitching moment and results of flow visualisation are presented. Surface flow visualisation studies reveal relatively complex boundary layer transition and separation phenomena although lift and drag characteristics are virtually invariant with Reynolds number in the range tested. A mixed two- and three-dimensional separation behaviour is observed at high incidence

Development of a Fast Response Pressure Probe for Use in a Cavitation Tunnel

The performance of a prototype fast response probe designed for use in a cavitation tunnel is investigated. The probe consists of a total head tube with an embedded miniature pressure sensor. Miniaturisation allows installation of the pressure transducer close to the head of the head of the instrument and improves frequency response through reducing inertia of fluid in the connecting tube. Measurements made with the fast response probe are compared with those of a Pitot tube connected to a slow response transducer and a hot film probe in a thickened turbulent boundary layer on the tunnel ceiling. Measurements of both streamwise velocity and turbulence made with the probe were found to compare well with those of a Pitot tube and a hot film probe. A useful frequency response up to 2.5kHz in water was demonstrated without any frequency compensation for pressure tube response

Cultural Geography: By Whom, for Whom?

Journal of Cultural Geography221147-15