ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    Acoustic Testing of a High-Tip-Speed Fan with Bypass-Duct Liners - Overview (2019)
    In:  CASI
    Details
    Publication Date: 2019-06-06
    Description: Under a pair of Space Act Agreements between NASA and Honeywell Aerospace, a model-scale (22 in.-diameter fan) acoustic wind tunnel test was carried out in the fall of 2014 in the NASA Glenn Research Center 9- by 15-Foot Low-Speed Wind Tunnel. The goal was to obtain acoustic pressure measurements for far-field, inlet and exit rotating rake, and in-duct microphone locations. This supersonic-tip-speed fan was tested in three bypass duct configurations: hard-wall, traditional liner, and advanced multiple-degree-of-freedom. Limited aerodynamic data was collected to verify the expected operating conditions. Preliminary analysis of the acoustic data finds it suitable for use in evaluating current NASA and Honeywell Aerospace acoustic tools and liner design practices. This report provides an overview of the test and some preliminary findings.
    Keywords: Acoustics; Aerodynamics
    Type: NASA/TM-2019-220162 , GRC-E-DAA-TN66525 , E-19678
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Tones Encountered with a Coannular Nozzle and a Method for Their Suppression (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: With multi-stream coannular nozzles, sometimes tones occur that may cause the nozzle to fail noise regulation standards. A two-stream nozzle was studied experimentally and numerically in an attempt to identify the sources of such tones and explore remedies. For the given nozzle configuration, sharp tones occurred in a range of low jet Mach numbers. The tones apparently occurred due to a coupling between vortex shedding from the struts, which held the nozzles and the center-body together, with various duct acoustic modes. A leading edge treatment of the struts is shown to eliminate the tones via disruption of the vortex shedding.
    Keywords: Acoustics; Aerodynamics
    Type: NASA/TM-2017-219559 , E-19408 , AIAA-2017-3860 , GRC-E-DAA-TN44168 , Aeroacoustics Conference (AIAA, CEAS) Aviation Forum 2017; Jun 05, 2017 - Jun 09, 2017; Denver, CO; United States|American Institute of Aeronautics and Astronautics (AIAA) Aviation Forum 2017; Jun 05, 2017 - Jun 09, 2017; Denver, CO; United States
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...