Flow over Rectangular Cylinders Immersed in a Turbulent Boundary Layer : Part 2 Flow Patterns and Pressure Distributions

Abstract

As continuation of the foregoing paper, the present paper describes the flow patterns around the rectangular cylinders immersed in a turbulent boundary layer and the pressure distribution on the surface of the cylinders. The effect of three parameters, i.e. h/σ, uτ/U∞ and the width-to-height ratio b/h on the pressure distribution is examined in some detail, where b and h are respectively the width and height of the cylinder, σ is the boundary-layer thickness, uτ is the shear velocity and U∞ is the free- stream velocity outside the boundary layer. The main results will be summarized as follows : (a) Three sets of measurements of the mean flow and turbulence are presented for the width-to-height ratios of 2.0 and 4.0 with h/σ =1.13 and 0.554. (b) The mean velocity profile in a constant pressure half-jet theoretically obtained by Goertler. (c) The base pressure of the cylinders can be correlated with h in the form of a wall law. (d) The pressure distribution on the upstream face of the cylinders can be represented by a single curve which is irrespective of the width-to-height ratio and the boundary-layer characteristics.