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Tuesday, November 10, 2020 | History

1 edition of NASA acoustically treated nacelle program found in the catalog.

NASA acoustically treated nacelle program

NASA acoustically treated nacelle program

a conference held at Langley Research Center, Hampton, Va., October 15, 1969.

by

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  • 20 Currently reading

Published by Scientific and Technical Information Division, Office of Technology Utilization, National Aeronautics and Space Administration; [for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va.] in Washington .
Written in English

    Subjects:
  • Airplanes -- Nacelles -- Congresses.,
  • Airplanes -- Noise -- Congresses.

  • Edition Notes

    Includes bibliographical references.

    SeriesNASA SP-220, NASA SP ;, 220.
    ContributionsLangley Research Center.
    Classifications
    LC ClassificationsTL681.5 .N17
    The Physical Object
    Paginationvi, 165 p.
    Number of Pages165
    ID Numbers
    Open LibraryOL4854598M
    LC Control Number75604634

      The National Aeronautics and Space Administration (NASA) has selected a new aviation industry team to lead an aircraft engine flight demonstration designed to .


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NASA acoustically treated nacelle program Download PDF EPUB FB2

Book Search tips Selecting this option will search all publications The NASA Acoustically Treated Nacelle Program The Journal of the panel in October to develop recommendations concerning the implementation of a coordinated noise‐abatement program.

A part of NASA's contribution to this program resulted in the Cited by: 3. NASA CR FINAL REPORT ACOUSTICALLY TREATED GROUND TEST NACELLE FOR THE GENERAL ELECTRIC TF34 TURBOFAN by D. Edkins General Electric Company Aircraft Engine Group Lynn, Massachusetts prepared for NATIONAL AERONAUTICS AND SPACE ADMINISTRATION Janu CONTRACT NAS Modification No.

1 NASA Lewis Research Center. The NASA Acoustically Treated Nacelle Program Lowry, John G. Abstract. Publication: Acoustical Society of America Journal. Pub Date: DOI: / The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A.

Resources About ADS ADS HelpCited by: 3. The NASA acoustically treated nacelle program. By J. Lowry. Abstract. NASA acoustically treated nacelle program reducing noise under commercial transport flight path near airport Topics: PROPULSION SYSTEMS.

Year: OAI identifier: NASA acoustically treated nacelle program book Author: J. Lowry. Abstract. NASA acoustically treated nacelle program to reduce jet aircraft nois. The test equipment used in the program included both the unsup-pressed and the fully suppressed engine, both velocity decayer NASA acoustically treated nacelle program book non-decayer exhaust nozzles, and a full-scale segment of an EBF wing and three-element flap system.

The design of an acoustically treated nacelle was accomplished. investment book value of airplane inventory would be increased percent, and In Maythe NASA initiated a program with the McDonnell Douglas Corporation to and model 6 1 airplanes with acoustically treated nacelles.

in this book, there are interrelated technical goals rooted in efficiency, noise, and emissions. Issues related to airframe integration, primarily engine nacelle placement and inlet and exhaust design, also can affect propulsion systems.

This is a survey of NASA’s work in aircraft propulsion from its origins as. The rotor and nacelle assembly was attached to an acoustically-treated, isolated rotor test stand through a mechanical pivot (the nacelle conversion axis), as shown in figure 1.

The nacelle (but not the spinner) contours model the V The test stand contained the electric motor assembly, and was attached to the DNW sting mount. nacelle assembly and the motor mount assembly.

The rotor and nacelle assembly was attached to the acoustically treated isolated rotor test stand at a mechanical pivot or Ôconversion axisÕ (fig.

This conversion axis allowed the nacelle to be manually rotated (in between tunnel runs) in 5 degree increments from airplane to helicopter modes. Abstract. A program to reduce the community noise levels of commercial jet aircraft is summarized. The program objective is the development of three acoustically treated nacelle configurations for the, and series aircraft to provide maximum noise reduction with minimum performance loss, modification requirements, and economic impact.

Program on ground test of modified quiet, clean, JT3D and JT8D turbofan engines in their respective nacelles A program to reduce the community noise levels of commercial jet aircraft is summarized. The program objective is the development of three acoustically treated nacelle configurations for the, and series aircraft to provide maximum noise reduction with minimum performance.

(matching the V). The rotor and nacelle assembly was attached to an acoustically-treated, isolated rotor test stand through a mechanical pivot (the nacelle conversion axis), as shown in figure 1.

The nacelle (but not the spinner) contours model the V The test stand contained the electric motor assembly, and was attached to the DNW sting. • Acoustically Treated Stator Vanes (“Soft Vanes”) Over-The-Rotor Fan Casing Treatment Test in NASA Glenn Active Noise Control Facility (ANCF) Over-The-Rotor and Soft Vanes designs in 22” Advanced Ducted Propulsor model Acoustically Treated Fan Casing Acoustically Treated Stator Vanes Current Areas of Investigation Under SFW UHB.

mode (matching the V). The rotor and nacelle assembly was attached to an acoustically-treated, isolated rotor test stand through a mechanical pivot (the nacelle conversion axis), as shown in figure 1. The nacelle (but not the spinner) contours model the V The test stand contained the electric motor assembly, and was attached to the DNW.

On the Development of an Efficient Parallel Hybrid Solver with Application to Acoustically Treated Aero-Engine Nacelles A finite element solution to the convected Helmholtz equation in a nonuniform flow is used to model the noise field within 3-D acoustically treated aero-engine nacelles.

Options to select linear or cubic Hermite polynomial basis functions and isoparametric elements are included. The results are presented of a preliminary flight engine design study based on the Quiet Engine Program high-bypass, low-noise turbofan engines. Engine configurations, weight, noise characteristics, and performance over a range of flight conditions typical of a subsonic transport aircraft were considered.

turbofan tested on April 1, InFlight tested on Boeing and DC-8 In s, low-bypass-ratio turbofans introduced InNASA initiates acoustically treated nacelle program INTRODUCTION Turbofan is a type of aircraft jet engine Turbofan is a portmanteau of Turbine & Fan Turbo portion refers to Gas Turbine A Ducted Fan uses.

Books at Amazon. The Books homepage helps you explore Earth's Biggest Bookstore without ever leaving the comfort of your couch. Here you'll find current best sellers in books, new releases in books, deals in books, Kindle eBooks, Audible audiobooks, and so much more. In MayThe Boeing Company was awarded NASA contract NAS 29, “Study and Development of Turbofan Nacelle Modifications to Minimize Fan-Compressor Noise Radiation.” The final phase of the program involved flight tests using a B/C airplane with acoustically treated nacelles.

In early jet engines, high velocity jet exhaust mixing with surrounding air is major source of noise In ’s, low-bypass-ratio turbofans introduced InNASA initiates acoustically treated nacelle program Engine ducts and inlets are lined with acoustic treatments 6. International Space Station Program Office Acoustics Noise Issue NASA Gregg Baumer/OE/ (Eric Clark/NS52/) Page No.

8 25 August Acoustic Requirements • SD - Node 2 PIDS ¾ Acoustic emission limits. The integrated acoustic. lector is acoustically treated in an acoustic wind tunnel. Its. NASA Aeronautics T est Program (a) NASA’s Aero- Book, Creare, Inc.

Hanover, Ne w Hampshire. The flight program was conducted jointly by MDC, Rolls-Royce Ltd., and the British Aerospace Corporation, using an HS aircraft modified to accept an upgraded RR Viper engine with conical reference and mechanical suppressor nozzles and an acoustically treated ejector.

The nacelle, engine and nozzle configurations from the HS were. Acoustic treatment consists in the application of sound absorbing material to the interior passages of the nacelle, as shown in figures (a) and (b) for short and.

(a) Corrugated-perimeter-type noise suppressor. (b) Multiple-tube-type noise suppressor. (c) Ejector-type noise suppressor.

The unique engine nacelle, flight hardware, and nacelles from the HS flight test program, combined with a simulated HS fuselage were windtunnel tested. Both propulsion and acoustic data were recorded.

Preliminary thrust data results from the wind tunnel tests are summarized and compared to other mechanical suppressor test results. “The NASA X-plane program is a great idea,” said and acoustic liners that extend into the nacelle lip region to help with noise reduction.

He is co-author of a book and has authored. The frequency spectrum was divided into high and low frequency regimes and two separate methods were developed and applied to account for physical factors associated with flight conditions.

For long wave propagation, the acoustic filed due to a point source near a solid obstacle was treated in terms of an inner region which where the fluid motion is essentially incompressible, and an outer. CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Since its founding, NASA has been dedicated to the advancement of aeronautics and space science.

The NASA Scientific and Technical Information (STI) Program Office plays a key part in helping NASA maintain this important role. The NASA STI Program Office is operated by Langley Research Center, the lead center for NASA.

The Phase II effort will include the capability of analyzing more complex 3D ducts with circumferential-segmented absorbing liners as well as external cowling and airframe noise sources.

The numerical algorithms of this TFD Phase I study will provide NASA Glen and industry an innovative tool for acoustic nacelle. NASA’s Aeronautics Test Program (ATP) is a model program (STOVL) concepts. The acoustically treated test section and microphones linked to a dynamic data system allow state- steady and unsteady pressures on a wing and nacelle at transonic conditions, testing a Smart Vehicle Configuration.

nozzle is shown with an acoustic treated shroud that could be removed. There was a similar shroud that was tested on the 12 chute and 48 tube nozzles. The acoustic treated shrouds were made with a perforated inner liner followed by a bulk absorber consisting of stainless steel wire mesh.

Cavity depths ranged up to in. for the shroud used. Lewis contracted General Electric in to build and aerodynamically test three experimental engines with inch diameter fans. The engines were then brought to Lewis and tested with an acoustically treated nacelle. This Fan Noise Test Facility was built off of the by Foot Supersonic Wind Tunnel’s Main Compressor and Drive Building.

The one-piece acoustic inlet liner will provide more fan noise suppression than the current GE90 segmented acoustic inlet liner. - Leading edge treatment on nacelle: The QTD 2 engine nacelle will have an acoustically treated inlet lip instead of the current hardwall structure. This will extend the acoustic treatment area.

nacelle assembly was attached to an acoustically-treated, isolated rotor test stand through a mechanical pivot (the nacelle conversion axis), as shown in figure 1.

The nacelle (but not the spinner) contours model the V The test stand contained the electric motor assembly, and was attached to the DNW sting mount. The conversion angle. system is acoustically treated to prevent an increase in test section background noise from B.L.S.

operation. The system includes acoustically treated flow removal ducts, flow plenum, flow reinjection ducting, and a flow rein-jection slot in the first diffuser floor. The boundary-layer system is driven by a centrifugal fan equipped with a. NASA Graduate Aeronautics Scholarship Program This program awards two-year scholarships for individuals pursuing or planning to pursue graduate studies leading to a master's or doctoral degree in a field related to aeronautics at accredited U.S.

academic institutions. The scholarship is administered through NASA's One-Stop Shopping Initiative. Careers in aircraft engine research and development are interesting and exciting. NASA Glenn Acoustics Branch engineer Dennis Huff shares more in an interview featured in Flying Magazine.

+ Read more ; The Little Engine that Could The Price Induction DGEN model turbofan engine paid a visit to the NASA Glenn Aero-Acoustic Propulsion Laboratory. are treated with 6 in of acoustically absorbent material to reduce reflections that can contaminate the noise field.

The NFAC can be internally reconfigured as an open-circuit tunnel with an by ft rectangular test section. The TTR can be tested in the 80x, although at much lower airspeed (about knots maximum). Fig. Dispersion, dissipation and refraction of shock waves in acoustically treated turbofan inlets Journal of Sound and Vibration, Vol.

Transfer element method with application to acoustic design of aeroengine nacelle. InNASA’s Science Mission Directorate (SMD) created the Science Activation (SciAct) program to increase the overall coherence of SMD’s education efforts, to support more effective, sustainable, and efficient use of SMD science discoveries for education, and to enable NASA scientists and engineers to engage more effectively and.LE HAVRE, France, Decem /PRNewswire/ Aircelle (Safran) will produce titanium exhaust systems for the new X commercial jetliner, marking the nacelle manufacturer's first major.including acoustic, blade surface pressure, and wake geometry data using a current-generation isolated tiltrotor model was conducted under the NASA Short Haul (Civil Tiltrotor) (SH(CT)) program using the TiltRotor Aeroacoustic Model (TRAM) in the Duits-Nederlandse Windtunnel (DNW).

The test was conducted as a joint effort of NASA, U.S. Army.