Experimental study on the aerodynamics of a high subsonic jet interacting with a flat plate

Anderson Proença¹; Jack Lawrence¹; Rod Self¹

¹ ISVR University of Southampton

doi:10.20906/CPS/COB-2015-0639

Resumo

Understanding the turbulent structures and noise source mechanisms resulting from the interaction between the exhausted jet with wing and high-lift devices is essential for both aerodynamic efficiency and noise reduction of the modern aircraft. This work presents an experimental investigation of the mean velocity and turbulence intensity (TI) profiles from an isolated jet and a jet installed beneath a flat plate. Both campaigns are performed in static ambient flow condition and at low and high subsonic velocity. A hot-wire anemometer was used to evaluate the mean velocity and TI for radial and axial profiles. From analysis of the mean velocity, it is evident that a Coandă effect exists in the installed jet case downstream of the trailing edge of the flat plate. The jet is seen to bend towards the plate. A comparison between isolated and installed configurations shows that the presence of the plate also serves to convect the jet asymmetrically downstream (similar to an ejector). Values of mean TI are lower along the shielded lip-line (closest to the plate) than along the unshielded lip-line. Directly after the trailing edge, there is an increase in TI. This fact supports the theory that an additional turbulent structure or wake is created.

Palavras-chave: installed jet; subsonic jet; aerodynamics; turbulence intensity; hot-wire