INVESTIGATION OF NOISE FROM FULL-SCALE HIGH BYPASS ENGINE AND BLOWN FLAP SYSTEM 740467
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.
Citation: Jones, W. and Heidelberg, L., "INVESTIGATION OF NOISE FROM FULL-SCALE HIGH BYPASS ENGINE AND BLOWN FLAP SYSTEM," SAE Technical Paper 740467, 1974, https://doi.org/10.4271/740467. Download Citation
Author(s):
W. L. Jones, L. J. Heidelberg
Affiliated:
NASA - Lewis Research Center
Pages: 32
Event:
National Air Transportation Meeting
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Scale models
Nozzles
Noise
Acoustics
Flaps
Wings
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