Aerodynamic characteristics of low-aspect-ratio prismatic bodies near a screen

Abstract

Data are presented on the drag and lift coefficients of prismatic bodies with an aspect ratio of λ=0.15–1.0 near a screen. The bodies were placed in the low velocity stream so that the planes of the square bases of the bodies were parallel to the screen plane. Body orientation in the scream corresponded to the minimum projected frontal area. The experiments were conducted in the Reynolds number range from 2·10⁵ to 9·10⁵ (the characteristic linear dimension is the side of the base). It is shown that approach of the prismatic models to the screen, simulating the ground, leads to some change of the drag coefficient and the appearance of a significant lift force tending to separate the model from the screen.