FULL-SCALE UPPER-SURFACE-BLOWN FLAP NOISE Lewis Research Center National Aeronautics and Space Administration Cleveland, Ohio 44135

Format:

Conference/Event

Author/Creator:

Heidelberg, L. J., author.

Conference Name:

National Air Transportation Meeting (1975-05-06 : Hartford, Connecticut, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1975

Summary:

A highly noise suppressed TF 34 engine was used to investigate the noise of several powered lift configurations involving upper-surface-blown (USB) flaps. The configuration variables were nozzle type (id est slot and circular with deflector), flap chord length, and flap angle. The results of velocity surveys at both the nozzle exit and the flap trailing edge are also presented and used for correlation of the noise data. Configurations using a long flap design were 4 dB quieter than a short flap typical of current trends in USB flap design. The lower noise for the long flap is attributed primarily to the greater velocity decay of the jet at the flap trailing edge. The full-scale data revealed substantially more quadrupole (V8) noise in the region near the deflected jet than observed in previous sub-scale tests

Notes:

Vendor supplied data

Publisher Number:

750609

Access Restriction:

Restricted for use by site license