Download or read book An Experimental Study of the Noise Generated by a Pusher Propeller Due to a Wake Entering the Propeller Disc written by and published by . This book was released on 1979 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the noise generated by a pusher propeller due to a wake entering the propeller disc was conducted. Acoustic measurements were made in a low speed wind tunnel with the propeller operating in a uniform velocity airstream, and with a wind mounted at various locations upstream of the propeller. For the propeller alone case the experimental results were compared with theoretical results.
Download or read book NASA Technical Paper written by and published by . This book was released on 1986 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Noise Measured from a Propeller in a Wake written by P. J. W. Block and published by . This book was released on 1984 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flow field Survey of an Empennage Wake Interacting with a Pusher Propeller written by and published by . This book was released on 1988 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Computational Study of the Noise Generated Due to Wake Interference with a Pusher Propeller written by Clay S. Mauk and published by . This book was released on 1992 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AIAA 84 2255 AIAA 84 2299 written by and published by . This book was released on 1984 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Directivity and Trends of Noise Generated by a Propeller in a Wake written by P. J. W. Block and published by . This book was released on 1986 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1980 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Directivity and Trends of Noise Generated by a Propeller in a Wake written by P. J. W. Block and published by . This book was released on 1986 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noise Generated by a Propeller in a Wake written by and published by . This book was released on 1984 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of Noise Measured from a Propeller in a Wake written by P. J. W. Block and published by . This book was released on 1984 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of the Effects of Installation on Single and Counter rotation Propeller Noise written by P. J. W. Block and published by . This book was released on 1986 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of the Effects of Installation on Singleand Counter rotation Propeller Noise written by and published by . This book was released on 1986 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AIAA 12th Aeroacoustics Conference written by and published by . This book was released on 1989 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic and Aerodynamic Study of a Pusher Propeller Aircraft Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: An aerodynamic and acoustic study was made of a pusher-propeller aircraft model in the NASA-Ames 7 x 10 ft Wind Tunnel. The test section was changed to operate as an open jet. The 591 mm diameter unswept propeller was operated alone and in the wake of three empennages: an I tail, Y tail, and a V tail. The radiated noise and detailed wake properties were measured. Results indicate that the unsteady blade loading caused by the blade interactions with the wake mean velocity distribution had a strong effect on the harmonics of blade passage noise. The blade passage harmonics above the first were substantially increased in all horizontal directions by the empennage/propeller interaction. Directivity in the plane of the propeller was maximum perpendicular to the blade surface. Increasing the tail loading caused the propeller harmonics to increase 3 to 5 dB for an empennage/propeller spacing of 0.38 mean empennage chords. The interaction noise became weak as empennage propeller spacing was increased beyond 1.0 mean empennage chord lengths. Unlike the mean wake deficit, the wake turbulence had only a small effect on the propeller noise, that effect being a small increase in the broadband noise. Soderman, Paul T. and Horne, W. Clifton Ames Research Center...
Download or read book Considerations of Wake excited Vibratory Stress in a Pusher Propeller written by Blake W. Corson and published by . This book was released on 1944 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: An equation based on simple blade-element theory and the assumption of a fixed wake pattern is derived and fitted to available data to show the first-order relation between the parameters of propeller operation and the intensity of the wake-excited periodic force acting on the blades of a pusher propeller. The derived equation indicates that the intensity of the wake-excited periodic force is directly proportional to air density, to airspeed, to rotational speed, and to propeller-disk area. The derived equation indicates that the effect of power coefficient upon the intensity of the wake-excited periodic force is small. In normal operation the vibratory force decreases with increased power coefficient. If a pusher propeller is used as a brake, increasing the power coefficient will increase the vibratory force. For geometrically similar pusher propellers, a propeller of large diameter will, in general, experience less wake-excited vibratory stress than a propeller of smaller diameter. Limited experimental data indicate that the wake-excited vibratory stress in a propeller increases with the drag of the body producing the wake.
