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Investigation of noise from full-scale high bypass engine and blown flap system (1974)

Heidelberg, L. J. ; Jones, W. L.

In: CASI

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Publication Date: 2019-07-13

Description: A summary is presented of an acoustic test program for investigating engine noise suppression and jet/flap interaction noise associated with an EBF STOL powered lift system. A highly suppressed TF-34 engine and EBF wing were used in the investigation. The engine was suppressed 21 PndB to a level of 94 PndB. An UTW powered lift system was tested with conventional, mixer, and decayer-type nozzles. The configuration with velocity decayer nozzle and acoustically treated shroud had the lowest noise (98 PndB). An OTW configuration with non-decayer nozzle was about 10 db quieter than the corresponding UTW system. UTW and OTW noise data are compared with scale model correlations.

Keywords: PROPULSION SYSTEMS

Type: NASA-TM-X-71539 , E-7946 , Air Transport Meeting; Apr 30, 1974 - May 02, 1974; Dallas

Format: application/pdf

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