ABSTRACT
Henri Coanda had observed that the burned gases which exhausted from the engine showed a tendency to remain very close to the fuselage. He was confident that he had discovered a new phenomenon and immediately began working on it to find practical applications. In laymen’s terms, “Coanda effect” is the tendency of a fluid to attach to, and flow around, solid surfaces. The significance of Coanda flow lies in the fact that it can be used as an effective flow control method. The jet flow from the surrounding air will be drawn in from ambient flow and, similar to the cases of flow over a straight wall at a sufficient distance from the jet, the Coanda effect will be apparent in the flow patterns. Coanda flows found in compressible and high-speed flows are substantially different from incompressible flows. The entrainment and turbulence levels of Coanda flows that are axisymmetric also increase noticeably through flow divergence.
