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Author : Vern G. Rollin
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (31 download)
Download or read book Effect of Multiple-nozzle Geometry on Jet Noise Generation written by Vern G. Rollin and published by . This book was released on 1961 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : VERN G. ROLLIN
Publisher :
ISBN 13 :
Total Pages : 1 pages
Book Rating : 4.:/5 (227 download)
Download or read book Effect of Multiple-nozzle Geometry on Jet-noise Generation written by VERN G. ROLLIN and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted in order to determine the effect of changes in the geometry of multijet nozzles on noise generation. Jet-pressure ratios of 1.67 and 2.33 were investigated for three-, five-, and seven-nozzle configurations with nozzle widths of 0.5, 0.75, 1.0, and 1.25 inches and spacings of 0.5, 1.0, and 1.5 inches. Test results showed that minimum power ratios were obtained at spacing ratios of 2.0 and 1.5 at subsonic and supersonic pressure ratios, respectively. Full-scale test results are in good agreement with the established curves. Significant reductions in the intensity of power-spectrum levels at the low- and midfrequency portions of the spectral distribution curve accompany a change in geometrical configuration of multiple nozzles to one with a minimum power ratio. (Author).
Author : Vern G. Rollin
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (249 download)
Download or read book Effect of Multi-nozzle Geometry on Jet-noise Generation written by Vern G. Rollin and published by . This book was released on 1961 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edmund E. Callaghan
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (681 download)
Download or read book Investigation of Far Noise Field of Jets written by Edmund E. Callaghan and published by . This book was released on 1956 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the effect of nozzle shape on the noise generation of air jets was conducted on convergent (circular, square, rectangular, and elliptical), convergent-divergent, and several plug-type nozzles. The nozzle areas were approximately equal to the area of a 3- or 4-inch-diameter circular nozzle. At jet pressure ratios less than 2.2, all the nozzles had essentially the same sound field. At higher pressure ratios, only the convergent-divergentnozzle showed any appreciable reduction in sound power below that of an ordinary convergent nozzle. All nozzles showed discrete-frequency-type noises at high pressure ratios. The convergent-divergentnozzle eliminated such discrete frequencies when operated near its design point.
Author :
Publisher :
ISBN 13 :
Total Pages : 458 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA Technical Note written by and published by . This book was released on 1961 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lorenzo R. Clark
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.F/5 ( download)
Download or read book Effects of geometry and jet velocity on noise associated with an upper-surface-blowing model written by Lorenzo R. Clark and published by . This book was released on 1977 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard R. Burley
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.F/5 ( download)
Download or read book Flight Velocity Effects on the Jet Noise of Several Variations of a 104-tube Suppressor Nozzle written by Richard R. Burley and published by . This book was released on 1974 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 492 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781724975348
Total Pages : 36 pages
Book Rating : 4.9/5 (753 download)
Download or read book Effects of Geometry and Jet Velocity on Noise Associated with an Upper-Surface-Blowing Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-09 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The noise characteristics associated with various upper surface blowing configurations were investigated using a small model consisting of a plate and flap assembly (simulated wing with flap) attached to a rectangular nozzle. Nozzle aspect ratio, flow-run length, and flap-deflection angle were the experimental parameters studied. Three nozzle-exit velocities were used. The normalized noise spectra obtained for different nozzle aspect ratios proved to be similar in terms of Strouhal number based on jet velocity and flow-run length. Consequently, the need for knowing local flow velocity and length scales (for example, at the flap trailing edge) as required in some of the existing noise prediction schemes is eliminated. Data are compared with results computed from three different noise prediction schemes, and the validity of each scheme is assessed. A simple method is proposed to evaluate the frequency dependence of acoustic shielding obtained with the simulated wing flap. Clark, L. R. and Yu, J. C. Langley Research Center NASA-TN-D-8386, L-11147 RTOP 505-03-11-04...
Author : Richard R. Burley
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (31 download)
Download or read book Flight Velocity Effects on Jet Noise of Several Variations of a 48-tube Suppressor Installed on a Plug Nozzle written by Richard R. Burley and published by . This book was released on 1974 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. C. Sperry
Publisher :
ISBN 13 :
Total Pages : 394 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fundamental Study of Jet Noise Generation and Suppression written by W. C. Sperry and published by . This book was released on 1960 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Warren J. North
Publisher :
ISBN 13 :
Total Pages : 26 pages
Book Rating : 4.:/5 (249 download)
Download or read book Effect of Exhaust-nozzle Ejectors on Turbojet Noise Generation written by Warren J. North and published by . This book was released on 1955 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engine noise levels and jet-velocity profiles have been obtained with several turbojet exhaust-nozzle ejectors. An insignificant reduction in total sound power was realized. At subsonic nozzle pressure ratios, total sound power from exhaust-nozzle ejectors or bypass exist configurations can be calculated from primary-jet parameters only.
Author :
Publisher :
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4.3/5 (91 download)
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1961 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 1116 pages
Book Rating : 4.:/5 (26 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1962 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781723423468
Total Pages : 24 pages
Book Rating : 4.4/5 (234 download)
Download or read book Experiments on High Bypass Internal Mixer Nozzle Jet Noise written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-20 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model scale jet noise data are presented for a variety of internal lobed mixer nozzle configurations for take off power settings in a static environment. The results are presented for a 17.5 cm diameter fan nozzle to show the effect on noise levels caused by changes in geometric shape of the internal, or core flow, nozzle. The geometric variables include the lobe discharge angle, the number of lobes, spacing between the center plug and lobe valley, lobe side wall shape and axial contour of the lobes. An annular plug core flow nozzle was also tested and is used as a baseline for comparative purposes. Comparison of data from the internal lobed configurations showed that for comparative effect, in terms of the effect on full scale perceived noise levels, was caused by a change in the lobe discharge angle. The results showed that increasing the discharge angle caused an increase as large as 7 dB in sound pressure levels in the high frequency portion of the spectra. Changes in the other geometric variables cause negligible effects. Goodykoontz, J. H. Glenn Research Center NASA-TM-83020, E-1456, NAS 1.15:83020 RTOP 505-31-32
Author : Carl Lewis Jaeck
Publisher :
ISBN 13 :
Total Pages : 118 pages
Book Rating : 4.F/5 ( download)
Download or read book Static and wind tunnel near-field/far-field jet noise measurements from model scale single-flow baseline and suppressor nozzles written by Carl Lewis Jaeck and published by . This book was released on 1977 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kenneth M. Eldred
Publisher :
ISBN 13 :
Total Pages : 246 pages
Book Rating : 4.3/5 (91 download)
Download or read book Supression of Jet Noise with Emphasis on the Near Field written by Kenneth M. Eldred and published by . This book was released on 1963 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
