Jet Direction Control Using Circular Cylinder with Tangential Blowing

Abstract

We propose a tangential blowing cylinder, a type of circulation control wing, to control the direction of a jet replacing a blade or a cascade. Flow characteristics including de fl ection are experimentally investigated. Speci fi cally, visualization observations, velocity distribution measurements, and the e ff ects of momentum ratio, injection angle, and location of the cylinder on the de fl ection angle of the jet are analyzed. The stalling at an angle-of-attack above 20° with a single blade impedes direction control for such large angles. However, the jet may be bent to approximately 90° by using the proposed tangential blowing cylinder. The optimal injection angle for controlling the jet direction and the unsteady characteristics downstream of the tangential blowing cylinder are also determined.