United Technologies Corporation

Bernd R Noack

Vincent C Nardone

Michael K Sahm

Daniel R Sabatino

David S Liscinsky

Fabio R Bertolotti

Fabio Paolo Bertolotti

Alexander I Khibnik

Satish Narayanan

Andrzej Banaszuk

In an air mixing arrangement wherein a primary fluid is introduced through an opening in a wall to be mixed with a secondary fluid flowing along the wall surface, the opening is airfoil shaped with its leading edge being orientated at an attack angle with respect to the secondary fluid flow stream so as to thereby enhance the penetration and dispersion of the primary fluid stream into the secondary fluid stream. The airfoil shaped opening is selectively positioned such that its angle of attack provides the desired lift to optimize the mixing of the two streams for the particular application. In one embodiment, a collar is provided around the opening to prevent the secondary fluid from contacting the surface of the wall during certain conditions of operation. Multiple openings maybe used such as the combination of a larger airfoil shaped opening with a smaller airfoil shaped opened positioned downstream thereof, or a round shaped opening placed upstream of an airfoil shaped opening. Pairs of openings and associated collars maybe placed in symmetric relationship so as to promote mixing in particular applications, and nozzles maybe placed on the inner side of wall to enhance the flow characteristics of the primary fluid.

Arrangement for controlling fluid jets injected into a fluid stream of a bleed air discharge nozzle

Arrangement for controlling fluid jets injected into a fluid stream

In an air mixing arrangement wherein a primary fluid is introduced through an opening in a wall to be mixed with a secondary fluid flowing along the wall surface, the opening is airfoil shaped with its leading edge being orientated at an attack angle with respect to the secondary fluid flow stream to enhance penetration and dispersion of the primary fluid stream into the secondary fluid stream. The airfoil shaped opening is selectively positioned such that its angle of attack provides the desired lift to optimize the mixing of the two streams for the particular application. Embodiments of the arrangement can comprise a collar around the openings, multiple openings that comprise a larger opening and a smaller opening positioned downstream, pairs of openings and associated collars symmetric relationship, and nozzles on the inner side of the wall.

A diffuser ( ) has a step ( ) in the surface ( ) just upstream of a point where boundary layer separation might occur. An acoustic jet ( ) has a nozzle ( ) immediately downstream of the step ( ); the acoustic jet is driven ( ) by a plurality of frequencies, one or more of which are subharmonics of another of them, and having different phases.

Control of flow separation with harmonic forcing and induced separation

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Berlin, Germany

Bernd R Noack