Download or read book An Experimental Study of Travelling Bubble Cavitation Noise written by M. F. Hamilton and published by . This book was released on 1981 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this investigation, high-frequency travelling-bubble cavitation noise generated on a Schiebe headform is analyzed with regard to noise theories which are based on the collapse of a single bubble. After normalizing the noise level by an event rate, -sigma C(p(min)) appears to provide a reasonable scaling factor for the noise level radiated per collapse, where sigma is the cavitation number and C(p(min)) is the minimum pressure coefficient on the headform. At frequencies above 10 kHz and free-stream flow velocities between 9.1 and 12.2 mps (30 and 40 fps), the noise level per collapse varied as roughly 1/sigma to the 8.4 power, and was constant with the flow velocity for constant -sigma/C(p(min)). The energy density spectra were flat from 10 to 100 kHz regardless of the cavitation number or free-stream velocity. (Author).
Download or read book An Experimental Study of Single Bubble Cavitation Noise written by Mark Harrison and published by . This book was released on 1952 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of the noise produced by a single cavitation bubble was made. The noise consists principally of a transient pressure pulse associated with the collapse of the bubble. The motion of the bubble was photographed simultaneously with the measurement of the pressure pulse. (Author).
Download or read book Travelling Bubble Cavitation and Resulting Noise written by Mark F. Hamilton and published by . This book was released on 1981 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many theories describing cavitation noise model the phenomenon by considering the independent annihilation of cavities in an infinite fluid. Since most practical applications involve cavitation generated by the dynamical action of flow, it is valuable to know how these theories will compare with such experimental data. In this investigation, a Schiebe body is employed as a headform that supports travelling bubble cavitation which is analyzed with regard to the various theories. High-speed films were taken of bubbles collapsing on the headform while the accompanying noise signal was recorded. These results showed rebounds to generate almost as much noise as the initial collapse. By counting the number of noise bursts occurring for given noise level and flow parameters, it was found that the noise energy per bubble varies with the cavitation number as roughly sigma to the -8 power above 10 kHz, but not at all with the free stream flow velocity V sub infinity between 30 and 40 fps. The spectral energy density was observed to be flat, regardless of sigma and V sub infinity, from 10 to 100 kHz. Although maximum bubble radii as functions of sigma and V sub infinity were not adequately measured during this study, it is clear that an understanding of this parameter is critical to any cavitation noise theory.
Download or read book Some Theoretical and Experimental Studies of Cavitation Noise written by Sanjay Kumar and published by . This book was released on 1992 with total page 294 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 1986 with total page 1066 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Study of Cavitation Phenomena written by Columban Conway and published by . This book was released on 1961 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cavitation written by Yves Lecoffre and published by CRC Press. This book was released on 1999-01-01 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text deals with the concept that cavitation is the main limitation to the performance of hydraulic components. Topics covered include the vaporization of liquids due to high velocities or pressure fluctuations, and the effects of cavitation on the performances of rotary machinery. One chapter is devoted to cavitation noise which concerns many users, including surface ships and submarines, and the author finishes with some examples of the use of cavitation and subject-specific measuring techniques.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Noise from Tip Vortex and Bubble Cavitation written by Defence Research Establishment Atlantic and published by Dartmouth, N.S. : Defence Research Establishment Atlantic. This book was released on 1990 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents results from experiments designed to study the sound from different types of propeller cavitation. The propellers used in the tests produced tip vortex and travelling bubble cavitation. The spectral content, directivity, and waveform of the far-field sound were measured, in essentially free-field conditions up to 100 kHz. These data were then correlated with information about the cavity dynamics, obtained from visual observations. Vibrational modes on the tip vortex cavities produced sound at characteristic frequencies. Bubble cavitation by itself produced very broadband noise, and strongly affected the vortex cavitation noise mechanisms if the free bubbles entered the tip vortices. The noise from both kinds of cavitation was directional. Keywords: Propeller, Cavitation, Noise, Spectra, Directivity, Waveform, Canada. (JHD).
Download or read book Frontiers in Experimental Fluid Mechanics written by Mohamed Gad-el-Hak and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamical systems theory and flow control are two research areas of great current interest. These and other special situations are among the topics covered in this volume. Each article emphasizes the use of experiments to achieve better physical understanding of a particular class of flow problems. The topics covered were chosen because of their importance to the field, recent appeal, and potential for future development. The articles are comprehensive and coverage is pedagogical with a bias towards recent developments.
Download or read book International Symposium on Cavitation Noise written by Roger E. A. Arndt and published by . This book was released on 1982 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bubble Dynamics and Resulting Noise from Traveling Bubble Cavitation written by Richard Chostner Marboe and published by . This book was released on 1982 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: The acoustic noise spectrum associated with traveling bubble cavitation on a Schiebe headform in a variable pressure water tunnel was measured over the 2.5 to 80 kHz frequency range. Bubble dynamics were observed through video taping and the nuclei distribution was obtained holographically. Observed noise spectra showed that low frequency noise can be modeled by incompressible theory. High frequency noise, apparently resulting from a shock wave, can be modeled by compressible theory. The spectrum was seen to shift toward lower frequencies than predicted possibly due to axisymmetric bubble collapse. The spectral energy per bubble was experimentally derived and was found to be a reasonable approximation to that predicted by incompressible theory over the cavitation number range tested. The collapse peak pressure amplitude distribution, the maximum bubble radius distribution and the nuclei distribution were all found to be lognormal. (Author).
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1968 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Studies of Cavitation Noise in a Free jet Tunnel written by C. S. Song and published by . This book was released on 1961 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of experimental studies on cavitation noise generated in the free-jet tunnel at St. Anthony Falls Hydraulic Laboratory in the period October 1960 to June 1961 are summarized. Two-dimensional test bodies of different shapes, such as a circular cylinder, wedge, and a TulinBurkhart hydrofoil were tested. Various types of cavitating flows, namely, transient cavities, steady-state cavities, and non-stationary cavities were covered. Special attention was given to the effect of ventilation on the intensity of cavitation noise. Effects of body size and the presence of a solid boundary were also investigated. (Author).
Download or read book An Experimental Investigation Into the Dynamics of Propeller Tip Vortices and the Associated Cavitation Noise written by Ghanem Farah Oweis and published by . This book was released on 2003 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Symposium on Cavitation Noise and Erosion in Fluid Systems 1989 written by William Bruce Morgan and published by American Society of Mechanical Engineers. This book was released on 1969 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Boundary layer Development on Cavitation Noise and Inception on a Hydrofoil written by and published by . This book was released on 1976 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
