NASA Technical Reports Server (NTRS) 20050051760: Technologies for Turbofan Noise Reduction

38.9 MB·English

by  NASA Technical Reports Server (NTRS)

‘Techuologics for Turhofun Noise Reduction

Dennis Hutt
NASA Glena Research Center

ABSTRACT

‘Ar, overviews presemation of NASA's engine noise ssscach since 19% is given for
subsonic commercial aircraft applications. CTighlighls age inckided tim the Advanced
Subsonic “Technology (AST) Noise Koduction Program and the Quiet Aiveratt
Techoology (QA) orject with emphasis on engine since noise reduction. Nuise
reiluction goels for 19 EPNUR ‘yy 2007 aad 20 EPNEB by 2022 wre reviewed. Pan él jet
nase lechnologics are highL.ghted Inve the AST paprans inching her bypass eatio
phapuisian, son inlots, fororard-cwept fans, swept leaned stators, cheveon nozzles nnise
Prediction mettusls nd active coise oun. far fons, Source diagnostio este fer fans aad
jets tha have been completed over che pant “ow years are presented showing how new
ow meamcerrent muthixls suc as Particle Emage Volacimety (NV) have played a key
role iu understanding terb-leuwey the noise generation rreeess, ané bow lo inmrove nisise
pralietion methods. ‘Tests fheusod on source devampustion hue lelped iclentaly sehich
engine curpponemis nese Turther noise reduotion, The rile of Commputetiona
Acron\cousties (CAA) for fun noise predictimm is preserted, Advunved nwise redvetion
methods such 2s Nerichel-Quincks tubes and lrailing edge blowing for lan mise ‘hal are
ssurvnily heing puriuel in the QA progsain see ulva prossoted. Highllghts are shown
from cugite validation and Might demonsziations that vere done ju the late 19997 wit:
Pract & Whitucy on their PWAN08 ongine and Honeywell on their {¥E-731-60 engine
Finally. finturs propulsion ccmligurations euurcetly being stud thal show promise
luswards meting NASA's lorg tarp geal of 0 lt noise reduction ave stow including &
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