Coandă effect - wiki

Venturi and Coandă effect (Photo credit: Wikipedia)

The Coandă effect (/ˈkwɑːndə/ or/ˈkwæ-/) is the tendency of a fluid jet to stay attached to a convex surface. The principle was named after Romanian aerodynamics pioneer Henri Coandă, who was the first to recognize the practical application of the phenomenon in aircraft development.

Henri Marie Coandă (Romanian pronunciation: [ɑ̃ˈri ˈko̯andə]; 7 June 1886 – 25 November 1972) was a Romanian inventor, aerodynamicspioneer and builder of an experimental aircraft, the Coandă-1910 described by Coandă in the mid-1950s as the world's first jet, a controversial claim disputed by some and supported by others. He invented a great number of devices, designed a "flying saucer" and discovered the Coandă effect of fluid dynamics.

The Coandă-1910, designed by Romanian inventor Henri Coandă, was an unconventional sesquiplane aircraft powered by a ducted fan. Called the "turbo-propulseur" by Coandă, its experimental engine consisted of a conventional piston engine driving a multi-bladed centrifugal blower which exhausted into a duct. The unusual aircraft attracted attention at the Second International Aeronautical Exhibition in Paris in October 1910, being the only exhibit without a propeller, but the aircraft was not displayed afterward and it fell from public awareness. Coandă used a similar turbo-propulseur to drive a snow sled, but he did not develop it further for aircraft.

*/A jet is a stream of fluid that is projected into a surrounding medium, usually from some kind of a nozzle,aperture or orifice.