A Study on the Flow Around Bluff Bodies Immersed in Turbulent Boundary Layers : Part 1, On the Form Drag of a Normal Plate

概要

論文の詳細を見る
In a flow field without pressure gradient, wind tunnel measurements of the pressure distributions on two-dimensional normal plates were carried out by eliminating the blockage effects to correlate with the characteristics of a smooth-wall boundary layer in which they are immersed. The drag coefficients are found to be expressed as a logarithmic function of h/σ up to h/σ =1.20, whereσ is the thickness of the undisturbed boundary layer at the position where the plate is mounted. Further, a correlation is obtained between the variation of form drag and the plate height h, which is analogous in form to the law of the wall of a boundary layer velocity profile. A method of calculating the pressure distributions on the front surface of the normal plate is proposed to analyse with the aid of a free-streamline theory. The method involves four parameters, however, which must be determined experimentally. The velocity field is integrated to construct a flow pattern for the purpose of comparing with one obtainable by the present analytical method.
一般社団法人日本機械学会の論文