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 deflection are experimentally investigated. Specifically, visualization observations, velocity distribution measurements, and the effects of momentum ratio, injection angle, and location of the cylinder on the deflection 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.

Influence of Amplitude of Excited Secondary Flow on the Direction of Jets

“…( 5). 14) In addition, as the waveforms of v r and jvj are almost the same for jvj > 0:2jU max j according to the preliminary experiment, it was confirmed that the influence on the deflection angle is negligible.…”

“…Several fundamental studies on fluidic thrust vectoring have been carried out. [11][12][13][14][15][16][17][18][19][20] Trancossi et al 21) investigated the Aerial Coanda High-Efficiency Orienting Nozzle (ACHEON) and discussed its practical application. Mason and Crowther 22) and Al-Asady and Abdullah 23) studied the directional control of a primary jet using a blowing flow applied as a secondary flow.…”