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Supersonic Jet Exhaust Noise Investigation Volume Iv Acoustic Far Field Near Field Data Report

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Supersonic Jet Exhaust Noise Investigation Volume Iv Acoustic Far Field Near Field Data Report

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Author : Paul R. Knott
language : en
Publisher:
Release Date : 1976

Supersonic Jet Exhaust Noise Investigation Volume Iv Acoustic Far Field Near Field Data Report written by Paul R. Knott and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.

This report is an acoustic data report presenting a series of parametric acoustic far-field and near-field results for subsonic and supersonic heated flow conditions for a simple conical nozzle (thin lip and thick lip) and a convergent-divergent nozzle at design and off-design conditions. (Author).

Supersonic Jet Exhaust Noise Investigation Volume I Summary Report

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Author : Paul R. Knott
language : en
Publisher:
Release Date : 1976

Supersonic Jet Exhaust Noise Investigation Volume I Summary Report written by Paul R. Knott and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.

This report summarizes major theoretical aerodynamic and acoustic developments and experimental findings aimed at providing a better understanding and a detailed mathematical specification of the noise-producing sources of simple exhaust jets. A review is given of calculation procedures for shock wave structure and flow field properties of simple circular jets. Results of new theoretical acoustic developments illustrating the influence of a jet's mean flow shrouding on jet acoustic radiation for unheated and heated jets are outlined. Additional discussions of interesting insights regarding the classical turbulent mixing theory of jet noise and the aeroacoustic formulations for a jet's orderly structure are given. Summaries of a series of high velocity, high temperature velocity field measurements using a General Electric developed laser velocimeter are discussed, and the application of the velocimeter for performing turbulence spectra and in-jet to far-field cross-correlation type measurements is reviewed. Key experiments illustrating the influence of swirl and combustion roughness on jet noise generation/reduction are presented. Results of high velocity and high temperature refraction experiments are also discussed, as well as discussions concerning jet flow amplifying effects of injected low frequency noise. Additionally, suggestions concerning shock-related noise as related to full-size engines are given. And finally, recommendations for future investigations are given. (Author).

Supersonic Jet Exhaust Noise Investigation Volume Ii Technical Report

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Author : Paul R. Knott
language : en
Publisher:
Release Date : 1976

Supersonic Jet Exhaust Noise Investigation Volume Ii Technical Report written by Paul R. Knott and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.

This report discusses detailed accounts of major theoretical and experimental investigations directed toward obtaining better understanding and mathematical specification of supersonic turbulent jets. Complete theoretical discussions are given describing the influence of a jet's mean flow shrouding on acoustic radiation of heated and unheated jets, approximate closed form acoustic expressions for turbulent mixing noise characterized by self-noise and shear-noise are given, and theoretical aero-acoustic formulations for the orderly structure of supersonic jets are reviewed. Extensive theory/data comparisons of developed acoustic models are given. Experimental investigations aimed at studying high velocity jet refraction, and the influence of jet swirl and upstream combustion roughness on jet noise is presented. Additionally, an extensive series of laser velocimeter measurements for high velocity and high temperature simple circular jets is discussed. Results include hot-film/laser velocimeter comparisons for ambient jets, mean velocity and turbulent velocity plume surveys of heated supersonic shock-free and shocked flow nozzles, and a demonstration experiment illustrating the capability of performing in-jet turbulence to far-field acoustic cross-correlation. (Author).

Near Field And Far Field Noise Measurements For A Blowdown Wind Tunnel Supersonic Exhaust Jet Having About 475 000 Pounds Of Thrust

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Author : William H. Mayes
language : en
Publisher:
Release Date : 1961

Near Field And Far Field Noise Measurements For A Blowdown Wind Tunnel Supersonic Exhaust Jet Having About 475 000 Pounds Of Thrust written by William H. Mayes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with categories.

Near-field and far-field noise surveys were made of the supersonic The exhaust jet of the Langley 9- by 6-foot thermal structures tunnel. The jet had a thrust rating of approximately 475,000 pounds. The sound power radiated was found to be about 3.6 x 10(exp 6) watts, and on an acoustical-mechanical efficiency basis this value is in reasonable agreement with data for smaller supersonic jets and for rocket engines of other investigations. Octave-band analyses of the near-field noise show that the maximum sound pressure levels in the low-frequency bands are greatest downstream, whereas maximum sound pressure levels in the high-frequency bands were greatest near the jet exit. A comparison of near-field noise measurements is made with data previously obtained for rocket engines. Noise survey measurements of the original jet are compared with similar data obtained after the addition of a 97-foot-long exit diffuser section, and an example of the application of this facility to the problem of acoustic environmental testing of a large space capsule is cited.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1987

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Aeronautics categories.

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Government Reports Annual Index

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Author :
language : en
Publisher:
Release Date : 1975

Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Government reports announcements & index categories.

Government Reports Annual Index

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Author :
language : en
Publisher:
Release Date : 1978

Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Research categories.

Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.