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Acoustic Benefits Of Stator Sweep And Lean For A High Tip Speed Fan

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Acoustic Benefits Of Stator Sweep And Lean For A High Tip Speed Fan

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Author :
language : en
Publisher:
Release Date : 2002

Acoustic Benefits Of Stator Sweep And Lean For A High Tip Speed Fan written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

Acoustic Benefits Of Stator Sweep And Lean For A High Tip Speed Fan

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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-19

Acoustic Benefits Of Stator Sweep And Lean For A High Tip Speed Fan written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-19 with categories.

A model high-speed fan stage was acoustically tested in the NASA Glenn 9- by 15-Foot Low Speed Wind Tunnel at takeoff/approach flight conditions. The fan was designed for a corrected rotor tip speed of 442 m/s (1450 ft/s), and had a powered core, or booster stage, giving the model a nominal bypass ratio of 5. The model also had a simulated engine pylon and nozzle bifurcation contained within the bypass duct. The fan was tested with three stator sets to evaluate acoustic benefits associated with a swept and leaned stator and with a swept integral vane/frame stator which incorporated some of the swept and leaned features as well as eliminated some of the downstream support structure. The baseline fan with the wide chord rotor and baseline stator approximated a current GEAE CF6 engine. A flyover effective perceived noise level (EPNL) code was used to generate relative EPNL values for the various configurations. Flyover effective perceived noise levels (EPNL) were computed from the model data to help project noise benefits. A tone removal study was also performed. The swept and leaned stator showed a 3 EPNdB reduction at lower fan speeds relative to the baseline stator; while the swept integral vane/frame stator showed lowest noise levels at intermediate fan speeds. Removal of the bypass blade passage frequency rotor tone (BPF) showed a 4 EPNdB reduction for the baseline and swept and leaned stators, and a 6 EPNdB reduction for the swept integral vane/ frame stator. Therefore, selective tone removal techniques such as active noise control and/or tuned liner could be particularly effective in reducing noise levels for certain fan speeds. Woodward, Richard P. and Gazzaniga, John A. and Bartos, Linda J. and Hughes, Christopher E. Glenn Research Center NASA/TM-2002-211345, E-13143, NAS 1.15:211345, AIAA Paper 2002-1034

Fan Noise Source Diagnostic Test Far Field Acoustic Results

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Author :
language : en
Publisher:
Release Date : 2002

Fan Noise Source Diagnostic Test Far Field Acoustic Results written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.

Handbook Of Engineering Acoustics

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Author : Gerhard Müller
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-11-06

Handbook Of Engineering Acoustics written by Gerhard Müller and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-11-06 with Science categories.

This acoustics handbook for mechanical and architectural applications is a translation of the German standard work on the subject. It not only describes the state of art of engineering acoustics but also gives practical help to engineers for solving acoustic problems. It deals with the origin, the transmission and the methods of abatement of air-borne and structure-borne sound of different kinds, from traffic to machinery and flow induced sound.

40th Aiaa Aerospace Sciences Meeting Exhibit

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Author :
language : en
Publisher:
Release Date : 2002

40th Aiaa Aerospace Sciences Meeting Exhibit written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Aeronautics categories.

Design And Test Of Fan Nacelle Models Quiet High Speed Fan Design

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Author :
language : en
Publisher:
Release Date : 2003

Design And Test Of Fan Nacelle Models Quiet High Speed Fan Design written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.

Aerodynamik Axialer Turbokompressoren

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Author : Franz Joos
language : de
Publisher: Springer-Verlag
Release Date : 2020-06-29

Aerodynamik Axialer Turbokompressoren written by Franz Joos and has been published by Springer-Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-06-29 with Technology & Engineering categories.

Dieses Fachbuch gibt einen fundierten Einblick in die mehrdimensionale Aerodynamik von Turbokompressoren anhand aktueller Designmerkmale sowie deren physikalischer Grundlagen. Zur Effizienzsteigerung von Gasturbinen und Industriekompressoren werden die Beschaufelungen mehrdimensional ausgelegt.