Coanda effect

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Demonstration of Coanda effect

Coanda effect - a physical phenomenon where the fluid stream (gas or liquid) tends to adhere to the nearest surface. The effect was named after the discoverer Henri Coanda. Discovery

Henri Coandă discovered this effect when experimenting with his Coandă 1910, the first jet aircraft to use the jet engine. In 1934 he patented in France "Method and apparatus for deflecting fluid into another fluid". The phenomenon known as the Coanda Effect has been described by the discoverer as "Deviation of the fluid stream, which, in proximity to the convex obstacle, enters into another fluid."

John Carver Meadows Frost, an employee of Avro Canada, using Coanda's work on his research, and in particular Aerodin Lenticular, spent much of his time exploring the effect that allowed him to design a series of hovercraft-like "hovercraft" in which the air escaped around the outer part and was directed downwards by tilting it over the inclined ring. It was an innovation in relation to traditional hovercraft, where air was blown to the central part and directed downward by a flexible apron. The only project ever built is the Avro Canada VZ-9-AV Avrocar.

The plane based on the Coanda effect was also built by the Russians, the design is called EKIP (Tarielka). Usage

The Coanda Effect has many uses in various aircrafts where the air moving over the wing can be directed towards the ground by using blades and setting the nozzle above the curved surface. The airflow from the jet engine located in the "skull" over the wing generates a bearing force through turbulent turbulence which does not occur with normal wings.

This was first used in practice in the American Air Force's AMST project. Several aircraft, especially in Boeing YC-14 (the first modern model to use the phenomenon), were built to take advantage of the Coanda effect by installing a turbofan engine on the top of the wings to provide high air velocity even at low flight speeds. The aircraft used in this system was produced in larger quantities, Antonov An-72. McDonnell Douglas YC-15 and his successor, Boeing C-17 Globemaster III, also use this effect, but to a lesser extent.

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