Experiments on Two-Dimensional Base Flow at Subsonic and Transonic Speeds

摘要

A report is presented of a series of experiments aimed at an investigation of the fundamental mechanisms of the flow behind an isolated blunt-trailing-edge section, and a rearward-facing step, at subsonic and transonic speeds.nPressure measurements and flow photography formed the principal research tools, but in connection with the tests on the isolated section an extensive wake exploration and a study of the vortex-shedding process were carried out. Tests were also made of simple devices which interfere with the formation of the vortex street.nThese tests are useful both from a basic research aspect and insofar as they indicate possible methods of reducing base drag.