Design of a supersonic Coanda jet nozzle

Axisymmetric Coanda-assisted vectoring

“…The Coanda flare jet is a three-dimensional tulip-shaped device that encourages greater entrainment in order to combust gases more efficiently, but for simplicity the examination was done only in two dimensions. GregorySmith and Gilchrist found the same bubble and separation characteristics that were found by Bevilaqua and Lee [29]. Hysteresis occurred in the breakaway point (hysteresis was greater for smaller b).…”

“…Bevilaqua and Lee [29] were possibly the first to concern themselves with two-dimensional supersonic flow over Coanda surfaces. They suggested that supersonic flows over Coanda surfaces have difficulty in initial attachment, due mainly to the balance between strong inertial forces and the necessary radial pressure gradient.…”

Design study of Coanda devices for transonic circulation control

“…In experiments on supersonic Coanda jets in still air, Cornelius and Lucius (25) showed that a simple converging-diverging nozzle extends the range of operating pressures at which the Coanda jet remains attached. Bevilaqua and Lee (26) reported on a method of characteristics design approach which skews the velocity and pressure profile along the jet exit such that the pressure and velocities at the Coanda surface are lower and higher, respectively. Using the radial velocity and pressure profiles of an irrotational vortex at the slot exit, jet attachment was promoted (26) .…”

“…Bevilaqua and Lee (26) reported on a method of characteristics design approach which skews the velocity and pressure profile along the jet exit such that the pressure and velocities at the Coanda surface are lower and higher, respectively. Using the radial velocity and pressure profiles of an irrotational vortex at the slot exit, jet attachment was promoted (26) .…”

On Some Recent Applications of the Coanda Effect to Acoustics

“…The interaction of the jet with these shock waves can act to precipitate jet flow detachment from the solid surface occurring. Bevilaqua et al 11 performed one of the few supersonic Coanda jet studies in which they tried to improve thrust vectoring by designing a supersonic nozzle in which the Coanda effect could be used to deflect the engine exhaust jet. Cornelius and Lucius 12 subsequently performed an experimental study of a two dimensional underexpanded supersonic Coanda jet flow around a circular cylinder.…”