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Noise Measurements Of Model Jet Augmented Lift Systems
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Book Synopsis Noise Measurements of Model Jet-augmented Lift Systems by : Frederick W. Gibson
Download or read book Noise Measurements of Model Jet-augmented Lift Systems written by Frederick W. Gibson and published by . This book was released on 1972 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise measurements were obtained on models of jet-augmented lift systems which are currently being considered for use on proposed short takeoff and landing vehicles. These configurations included a conventional internally blown flap, an augmenter wing, an externally blown flap, and modifications of these basic concepts. The tests were conducted in the Langley anechoic noise facility at zero forward speed with cold air jets. The conventional internally blown flap exhibited lower noise levels than the augmenter wing and the externally blown flap at the same pressure ratios, being of the order of 8 dB or more at the lowest pressure ratio and of the order of 20 dB at the highest pressure ratio of the tests. The data also indicated that for the conventional internally blown flap, there may be an optimum gap size (other than zero) between the turning lip and the flap leading edge from the standpoint of minimum noise generation or admittance. Increasing the trailing-edge thickness of the plain internally blown flap produced no appreciable change in the overall sound pressure level or frequency spectral content in the range of the tests. The data indicated that at a position on the ground directly under the jet exit, the externally blown flap and the augmeter-wing overall noise levels are comparable to each other throughout the pressure range of the tests.
Book Synopsis Noise Measurements of Model Jet-augmented Lift Systems by : Frederick W. Gibson
Download or read book Noise Measurements of Model Jet-augmented Lift Systems written by Frederick W. Gibson and published by . This book was released on 1972 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Characteristics, Temperature, and Noise Measurements of a Large-scale External-flow Jet-augmented-flap Model with Turbojet Engines Operating by : Marvin P. Fink
Download or read book Aerodynamic Characteristics, Temperature, and Noise Measurements of a Large-scale External-flow Jet-augmented-flap Model with Turbojet Engines Operating written by Marvin P. Fink and published by . This book was released on 1961 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation has been conducted in the Langley full-scale tunnel on a large-scale model powered by turbojet engines with flattened rectangular nozzles. The wing had 35° sweep of the leading edge, an aspect ratio of 6.5, a taper ratio of 0.31, and NACA 65(1)-412 and 65-408 airfoils at the root and tip. The investigation included measurements of the longitudinal aerodynamic characteristics of the model with half-span and full-span flaps and measurements of the sound pressure and skin temperature on the portions of the lower surface of the wing immersed in the jet flow. The tests were conducted over a range or angles of attack from -8° to 16° for Reynolds numbers from 1.8 x 106 to 4.4 x 106 and a range of momentum coefficients from 0 to 2.0. In general, the aerodynamic results of this investigation made with a large-scale hot-jet model verified the results of previous investigations with small models powered by compressed-air jets. Although blowing was only done over the inboard portion of the wing, substantial amounts of induced lift were also obtained over the outboard portion of the wing. Skin temperatures were about 340° F and wing heating could be handled with available materials without cooling. Random acoustic loadings on the wing surface were high enough to indicate that fatigue failure from this source would require special consideration in the design of an external-flow jet flap system for an airplane.
Download or read book NASA Technical Note written by and published by . This book was released on 1975 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind-tunnel Investigation of Aerodynamic Performance, Steady and Vibratory Loads, Surface Temperatures, and Acoustic Characteristics of a Large-scale Twin-engine Upper-surface Blown Jet-flap Configuration by :
Download or read book Wind-tunnel Investigation of Aerodynamic Performance, Steady and Vibratory Loads, Surface Temperatures, and Acoustic Characteristics of a Large-scale Twin-engine Upper-surface Blown Jet-flap Configuration written by and published by . This book was released on 1976 with total page 208 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 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Compilation of Research Reports of Physical Research Division, Dynamic Loads Division, Loads Division, 1921 - 1973 by : Gloria R. Champine
Download or read book A Compilation of Research Reports of Physical Research Division, Dynamic Loads Division, Loads Division, 1921 - 1973 written by Gloria R. Champine and published by . This book was released on 1977 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1972 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications, Cumulative Index by : United States. Superintendent of Documents
Download or read book Monthly Catalog of United States Government Publications, Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1976 with total page 1466 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1972 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic and Noise Measurements on a Quasi-two Dimensional Augmentor Wing Model with Lobe-type Nozzles by :
Download or read book Aerodynamic and Noise Measurements on a Quasi-two Dimensional Augmentor Wing Model with Lobe-type Nozzles written by and published by . This book was released on 1973 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Blown Flap Noise Prediction written by and published by . This book was released on 1978 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transportation Noise Bulletin written by and published by . This book was released on 1972 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeroacoustics written by Ira R. Schwartz and published by . This book was released on 1976 with total page 494 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 1971 with total page 580 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 Progress in Astronautics and Aeronautics by :
Download or read book Progress in Astronautics and Aeronautics written by and published by . This book was released on 1976 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis S.A.E. Transactions by : Society of Automotive Engineers
Download or read book S.A.E. Transactions written by Society of Automotive Engineers and published by . This book was released on 1975 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning in 1985, one section is devoted to a special topic
