Detailed noise measurements on the SR-7A propeller

tone behavior with helical tip Mach number
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National Aeronautics and Space Administration, For sale by the National Technical Information Service , [Washington, DC], [Springfield, Va
Airplanes -- N
StatementJames H. Dittmar and David G. Hall.
SeriesNASA technical memorandum -- 105206.
ContributionsHall, David G., United States. National Aeronautics and Space Administration.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL15356183M

Detailed noise measurements were taken on the SR-7A propeller to investigate the behavior of the noise with helical tip Mach number. Data sets taken at constant advance ratio and at constant axial Mach number both showed the noise to first rise with increasing helical tip Mach number and then to level off as the Mach number was increased Size: 9MB.

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Detailed noise measurements on the SR-7A propeller: tone behavior with helical tip Mach number. [James H Dittmar; David G Hall; United. Detailed noise measurements on the SR-7A propeller tone behavior with helical tip Mach number. [Washington, DC]: [Springfield, Va: National Aeronautics and Space Administration ; For sale by the National Technical Information Service.

MLA Citation. Dittmar, James H. Detailed noise measurements on the SR-7A propeller: Tone behavior with helical tip Mach number eBook: National Aeronautics and Space Administration NASA: : Kindle StoreAuthor: National Aeronautics and Space Administration NASA.

An impeller is a rotor inside a pump through which the liquid flows to create a pressure gradient.

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A propeller is used to propel a vessel. In pump impeller liquid moves i.e. pump is stationary. Buy Detailed noise measurements on the SR-7A propeller tone behavior with helical tip Mach number (SuDoc NAS ) by James H.

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Wind tunnels 'Detailed noise measurements on the SR-7A propeller' -- subject(s): Noise, Airplanes 'The. Compari son with SR-7A Data Noise variation with helical tip Mach number.

- The SR-7A propeller's (refs. 6 and 7) leadinq edqe sweep was tailored to provide a noise reduction at the cruise condition (i.e.1 M = 0'.8 and J = ): Comparison of the SR-7A propeller noise with that of the straight blade SR-2 propeller yields a measureFile Size: 1MB.

Full text of "The effect of swirl recovery vanes on the cruise noise of an advanced propeller" See other formats NASA Technical Memorandum AIAA The Effect of Swirl Recovery Vanes on the Cruise Noise of an Advanced Propeller James H.

Dittmar National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio and David G. Hall Sverdrup Technology, Inc. Lewis. Potential reduction of en route noise from an advanced turboprop aircraft [microform] / James H.

Dittmar National Aeronautics and Space Administration ; For sale by the National Technical Information Service [Washington, DC]: [Springfield, Va Australian/Harvard Citation.

Dittmar, James H.

Description Detailed noise measurements on the SR-7A propeller FB2

& United States. by Dittmar and Stang 14 for a scale model SR-7A propfan operating at simulated cruise conditions. All of the acoustic calculations presented in this paper are for BPF tone noise. Noise comparisons of the straight-blade SR-2 propeller and the swept-blade SR-7A propeller showed that the tailored sweep of the SR-7A appears to be the cause of both lower peak noise levels and a.

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