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Acoustic Tests Of Duct Burning Turbofan Jet Noise Simulation
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Author :United States. National Aeronautics and Space Administration. Scientific and Technical Information Office Publisher : ISBN 13 : Total Pages :356 pages Book Rating :4.:/5 (31 download)
Book Synopsis Acoustic Tests of Duct-burning Turbofan Jet Noise Simulation by : United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
Download or read book Acoustic Tests of Duct-burning Turbofan Jet Noise Simulation written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Office and published by . This book was released on 1978 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. National Aeronautics and Space Administration. Scientific and Technical Information Office Publisher : ISBN 13 : Total Pages :356 pages Book Rating :4.:/5 (317 download)
Book Synopsis Acoustic Tests of Duct-burning Turbofan Jet Noise Simulation by : United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
Download or read book Acoustic Tests of Duct-burning Turbofan Jet Noise Simulation written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Office and published by . This book was released on 1978 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of a static acoustic and aerodynamic performance, model-scale test program on coannular unsuppressed and multielement fan suppressed nozzle configurations are summarized. The results of the static acoustic tests show a very beneficial interaction effect. When the measured noise levels were compared with the predicted noise levels of two independent but equivalent conical nozzle flow streams, noise reductions for the unsuppressed coannular nozzles were of the order of 10 PNdB; high levels of suppression (8 PNdB) were still maintained even when only a small amount of core stream flow was used. The multielement fan suppressed coannular nozzle tests showed 15 PNdB noise reductions and up to 18 PNdB noise reductions when a treated ejector was added. The static aerodynamic performance tests showed that the unsuppressed coannular plug nozzles obtained gross thrust coefficients of 0.972, with 1.2 to 1.7 percent lower levels for the multielement fan-suppressed coannular flow nozzles. For the first time anywhere, laser velocimeter velocity profile measurements were made on these types of nozzle configurations and with supersonic heated flow conditions. Measurements showed that a very rapid decay in the mean velocity occurs for the nozzle tested.
Book Synopsis Aerodynamic and Acoustic Tests of Duct-burning Turbofan Exhaust Nozzles by : Hilary Kozlowski
Download or read book Aerodynamic and Acoustic Tests of Duct-burning Turbofan Exhaust Nozzles written by Hilary Kozlowski and published by . This book was released on 1976 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The static aerodynamic and acoustic characteristics of duct-burning turbofan (DBTF) exhaust nozzles are established. Scale models, having a total area equivalent to a 0.127 m diameter convergent nozzle, simulating unsuppressed coannular nozzles and mechanically suppressed nozzles with and without ejectors (hardwall and acoustically treated) were tested in a quiescent environment. The ratio of fan to primary area was varied from 0.75 to 1.2. Far field acoustic data, perceived noise levels, and thrust measurements were obtained for 417 test conditions. Pressure ratios were varied from 1.3 to 4.1 in the fan stream and from 1.53 to 2.5 in the primary stream. Total temperature varied from 395 to 1090 K in both streams. Jet noise reductions relative to synthesized prediction from 8 PNdB (with the unsuppressed coannular nozzle) to 15 PNdB (with a mechanically suppressed configuration) were observed at conditions typical of engines being considered under the Advanced Supersonic Technology program. The inherent suppression characteristic of the unsuppressed coannular nozzle is related to the rapid mixing in the jet wake caused by the velocity profiles associated with the DBTF. Since this can be achieved without a mechanical suppressor, significant reductions in aircraft weight or noise footprint can be realized.
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1980 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1980 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography of Lewis Research Center Technical Publications Announced in 1977 by : Lewis Research Center
Download or read book Bibliography of Lewis Research Center Technical Publications Announced in 1977 written by Lewis Research Center and published by . This book was released on 1978 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This compilation of abstracts describes and indexes over 780 technical reports resulting from the scientific and engineering work performed and managed by the Lewis Research Center in 1977. All the publications were announced in the 1977 issues of STAR (Scientific and Technical Aerospace Reports) and/or IAA (International Aerospace Abstracts). Documents cited include research reports, journal articles, conference presentations, patents and patent applications, and theses.
Author :United States. Congress. House. Committee on Science and Astronautics. Subcommittee on Energy Publisher : ISBN 13 : Total Pages :1418 pages Book Rating :4.3/5 (121 download)
Book Synopsis Solar Photovoltaic Energy by : United States. Congress. House. Committee on Science and Astronautics. Subcommittee on Energy
Download or read book Solar Photovoltaic Energy written by United States. Congress. House. Committee on Science and Astronautics. Subcommittee on Energy and published by . This book was released on 1974 with total page 1418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1979 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. House. Committee on Science and Astronautics. Subcommittee on Aeronautics and Space Technology Publisher : ISBN 13 : Total Pages :268 pages Book Rating :4.0/5 (18 download)
Book Synopsis Advanced Supersonic Technology by : United States. Congress. House. Committee on Science and Astronautics. Subcommittee on Aeronautics and Space Technology
Download or read book Advanced Supersonic Technology written by United States. Congress. House. Committee on Science and Astronautics. Subcommittee on Aeronautics and Space Technology and published by . This book was released on 1974 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Supersonic Technology, Hearing Before the Subcommittee on Aeronautics and Space Technology Of..., 93-2, February 22, 1974 by : United States. Congress. House. Science and Astronautics Committee
Download or read book Advanced Supersonic Technology, Hearing Before the Subcommittee on Aeronautics and Space Technology Of..., 93-2, February 22, 1974 written by United States. Congress. House. Science and Astronautics Committee and published by . This book was released on 1974 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by : United States. Superintendent of Documents
Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1250 pages. Available in PDF, EPUB and Kindle. Book excerpt: February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1978-11 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Reference Publication written by and published by . This book was released on 1991 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP. written by and published by . This book was released on 1981 with total page 750 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1980 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1979 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Book Synopsis Aeroacoustics of Flight Vehicles: Noise control by : Harvey H. Hubbard
Download or read book Aeroacoustics of Flight Vehicles: Noise control written by Harvey H. Hubbard and published by . This book was released on 1991 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
