A Theoretical Prediction Method For Trapped Mode Flow Acoustic Resonances In A Wind Tunnel With A Side Cavity

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A Theoretical Prediction Method for Trapped Mode Flow-Acoustic Resonances in a Wind Tunnel with a Side Cavity

Author : Ying Fang
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis A Theoretical Prediction Method for Trapped Mode Flow-Acoustic Resonances in a Wind Tunnel with a Side Cavity by : Ying Fang

Download or read book A Theoretical Prediction Method for Trapped Mode Flow-Acoustic Resonances in a Wind Tunnel with a Side Cavity written by Ying Fang and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavity flow-acoustic resonances may occur when a fluid stream flows past a recessed cavity in a wall. These resonances may lead to high unsteady pressure levels. The resonance involves a coupling between the instability wave which propagates downstream on the shear-layer that spans the open face of the cavity, and acoustic waves that propagate back upstream inside and outside the cavity. These waves are coupled by the scattering processes at the ends of the cavity. Previous theoretical research considered cavities in a wall that bounds an infinite stream. In many of the experiments on cavity resonances, however, the cavity is placed in a side wall of a wind tunnel. When the surrounding wind tunnel walls are not acoustically treated, the resonances can be very strong. My research is a theoretical investigation of the case of a cavity in a side wall of a wind tunnel. Recently, a mode trapping phenomenon has been proposed as an explanation for the very strong cavity resonances in the wind tunnel case. The mode trapping occurs when the critical frequency of a mode in the tunnel-cavity region is slightly lower than the critical frequency of the corresponding mode in the tunnel region. The region between these two critical frequencies is defined as a frequency window. Experiments show that very high pressure levels are observed in these frequency windows. The goal of my research is to develop a global theory of cavity resonances in the wind tunnel geometry. The global theory couples solutions for the instability wave and the acoustic waves through scattering analyses at the ends of the cavity. Resonance frequencies, spatial mode shapes and linear growth rates are predicted. The theoretical predictions are consistent with experimental measurements and demonstrate that the mode trapping phenomenon explains the experimentally observed behavior.

A Theory for Predicting Boundary Impedance and Resonance Frequencies of Slotted-Wall Wind Tunnels, Including Plenum Effects

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781723399084
Total Pages : 24 pages
Book Rating : 4.3/5 (99 download)

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Book Synopsis A Theory for Predicting Boundary Impedance and Resonance Frequencies of Slotted-Wall Wind Tunnels, Including Plenum Effects by : National Aeronautics and Space Administration (NASA)

Download or read book A Theory for Predicting Boundary Impedance and Resonance Frequencies of Slotted-Wall Wind Tunnels, Including Plenum Effects written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-21 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wave-induced resonance associated with the geometry of wind-tunnel test sections can occur. A theory that uses acoustic impedance concepts to predict resonance modes in a two dimensional, slotted wall wind tunnel with a plenum chamber is described. The equation derived is consistent with known results for limiting conditions. The computed resonance modes compare well with appropriate experimental data. When the theory is applied to perforated wall test sections, it predicts the experimentally observed closely spaced modes that occur when the wavelength is not long compared with he plenum depth. Barger, R. L. Langley Research Center NASA-TP-1880, L-14480 RTOP 505-43-23-02

Acoustic Measurements of a Large Cavity in a Wind Tunnel

Author : James Scheiman
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Acoustic Measurements of a Large Cavity in a Wind Tunnel by : James Scheiman

Download or read book Acoustic Measurements of a Large Cavity in a Wind Tunnel written by James Scheiman and published by . This book was released on 1978 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Theory for Predicting Boundary Impedance and Resonance, Frequencies of Slotted-wall Wind Tunnels, Including Plenum Effects

Author : Raymond L. Barger
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis A Theory for Predicting Boundary Impedance and Resonance, Frequencies of Slotted-wall Wind Tunnels, Including Plenum Effects by : Raymond L. Barger

Download or read book A Theory for Predicting Boundary Impedance and Resonance, Frequencies of Slotted-wall Wind Tunnels, Including Plenum Effects written by Raymond L. Barger and published by . This book was released on 1981 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

International Aerospace Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 974 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis International Aerospace Abstracts by :

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Correlation of Wind Tunnel Data with Theoretical Predictions of Flow Angularity Induced by an Unsymmetrical Model Support

Author : Michael S. Hartley
Publisher :
ISBN 13 :
Total Pages : 49 pages
Book Rating : 4.:/5 (8 download)

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Book Synopsis Correlation of Wind Tunnel Data with Theoretical Predictions of Flow Angularity Induced by an Unsymmetrical Model Support by : Michael S. Hartley

Download or read book Correlation of Wind Tunnel Data with Theoretical Predictions of Flow Angularity Induced by an Unsymmetrical Model Support written by Michael S. Hartley and published by . This book was released on 1969 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Effect of Wind Tunnel Acoustic Modes on Linear Oscillating Cascade Aerodynamics

Author : Daniel H. Buffum
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Effect of Wind Tunnel Acoustic Modes on Linear Oscillating Cascade Aerodynamics by : Daniel H. Buffum

Download or read book Effect of Wind Tunnel Acoustic Modes on Linear Oscillating Cascade Aerodynamics written by Daniel H. Buffum and published by . This book was released on 1993 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Wind Tunnel Resonance by the Finite Element Method

Author : In Lee
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Wind Tunnel Resonance by the Finite Element Method by : In Lee

Download or read book Wind Tunnel Resonance by the Finite Element Method written by In Lee and published by . This book was released on 1986 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Prediction of Resonance Frequencies for Ventilated Wall Wind Tunnels

Author : M. Mokry
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (228 download)

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Book Synopsis Prediction of Resonance Frequencies for Ventilated Wall Wind Tunnels by : M. Mokry

Download or read book Prediction of Resonance Frequencies for Ventilated Wall Wind Tunnels written by M. Mokry and published by . This book was released on 1984 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the reflection and refraction of plane acoustic waves at an interface between the moving stream and the stagnant plenum air, a simple theory is developed for ventilated walls. The intensity and frequency of resonance are determined from the modulus and the argument of the wall reflection coefficient respectively. In contrast to the eigenvalue method, the present technique is capable of predicting partial resonance, occuring in perforated walls and also in slotted walls at Mach numbers below 0.618, for which the resonant waves are partly reflected and partly transmitted at the wall. The reverse transmission of waves from the plenum into the test section is found to be inconsistent with the postulated resonance condition and is therefore not considered.

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 1038 pages
Book Rating : 4.:/5 (31 download)

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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 1972 with total page 1038 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Applied Mechanics Reviews

Author :
Publisher :
ISBN 13 :
Total Pages : 390 pages
Book Rating : 4.3/5 (243 download)

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Book Synopsis Applied Mechanics Reviews by :

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1994 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Aeroacoustics of Flight Vehicles

Author : Harvey H. Hubbard
Publisher :
ISBN 13 :
Total Pages : 620 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Aeroacoustics of Flight Vehicles by : Harvey H. Hubbard

Download or read book Aeroacoustics of Flight Vehicles written by Harvey H. Hubbard and published by . This book was released on 1991 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook of the Acoustic Characteristics of Turbomachinery Cavities

Author : Michael J. Lucas
Publisher : American Society of Mechanical Engineers
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Handbook of the Acoustic Characteristics of Turbomachinery Cavities by : Michael J. Lucas

Download or read book Handbook of the Acoustic Characteristics of Turbomachinery Cavities written by Michael J. Lucas and published by American Society of Mechanical Engineers. This book was released on 1997 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide for mechanical engineers to identifying flow-induced noise and vibration sources within machinery that could cause catastrophic failure. Explains methods for computing frequencies for self-sustained oscillations, and presents formulae to calculate the acoustic resonant modes for ducts and cavities. Considers the general types of flow configurations that are known to produce self-sustained oscillations and includes a complete collection of models. Annotation copyrighted by Book News, Inc., Portland, OR

Introduction to Hydrodynamic Stability

Author : P. G. Drazin
Publisher : Cambridge University Press
ISBN 13 : 1316582876
Total Pages : 278 pages
Book Rating : 4.3/5 (165 download)

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Book Synopsis Introduction to Hydrodynamic Stability by : P. G. Drazin

Download or read book Introduction to Hydrodynamic Stability written by P. G. Drazin and published by Cambridge University Press. This book was released on 2002-09-09 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Instability of flows and their transition to turbulence are widespread phenomena in engineering and the natural environment, and are important in applied mathematics, astrophysics, biology, geophysics, meteorology, oceanography and physics as well as engineering. This is a textbook to introduce these phenomena at a level suitable for a graduate course, by modelling them mathematically, and describing numerical simulations and laboratory experiments. The visualization of instabilities is emphasized, with many figures, and in references to more still and moving pictures. The relation of chaos to transition is discussed at length. Many worked examples and exercises for students illustrate the ideas of the text. Readers are assumed to be fluent in linear algebra, advanced calculus, elementary theory of ordinary differential equations, complex variables and the elements of fluid mechanics. The book is aimed at graduate students but will also be very useful for specialists in other fields.

Aeroacoustics of Low Mach Number Flows

Author : Stewart Glegg
Publisher : Academic Press
ISBN 13 : 0128097930
Total Pages : 554 pages
Book Rating : 4.1/5 (28 download)

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Book Synopsis Aeroacoustics of Low Mach Number Flows by : Stewart Glegg

Download or read book Aeroacoustics of Low Mach Number Flows written by Stewart Glegg and published by Academic Press. This book was released on 2017-02-15 with total page 554 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aeroacoustics of Low Mach Number Flows: Fundamentals, Analysis, and Measurement provides a comprehensive treatment of sound radiation from subsonic flow over moving surfaces, which is the most widespread cause of flow noise in engineering systems. This includes fan noise, rotor noise, wind turbine noise, boundary layer noise, and aircraft noise. Beginning with fluid dynamics, the fundamental equations of aeroacoustics are derived and the key methods of solution are explained, focusing both on the necessary mathematics and physics. Fundamentals of turbulence and turbulent flows, experimental methods and numerous applications are also covered. The book is an ideal source of information on aeroacoustics for researchers and graduate students in engineering, physics, or applied math, as well as for engineers working in this field. Supplementary material for this book is provided by the authors on the website www.aeroacoustics.net. The website provides educational content designed to help students and researchers in understanding some of the principles and applications of aeroacoustics, and includes example problems, data, sample codes, course plans and errata. The website is continuously being reviewed and added to. Explains the key theoretical tools of aeroacoustics, from Lighthill’s analogy to the Ffowcs Williams and Hawkings equation Provides detailed coverage of sound from lifting surfaces, boundary layers, rotating blades, ducted fans and more Presents the fundamentals of sound measurement and aeroacoustic wind tunnel testing

Low-Speed Wind Tunnel Testing

Author : Jewel B. Barlow
Publisher : John Wiley & Sons
ISBN 13 : 0471557749
Total Pages : 738 pages
Book Rating : 4.4/5 (715 download)

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Book Synopsis Low-Speed Wind Tunnel Testing by : Jewel B. Barlow

Download or read book Low-Speed Wind Tunnel Testing written by Jewel B. Barlow and published by John Wiley & Sons. This book was released on 1999-02-22 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brand-new edition of the classic guide on low-speed wind tunnel testing While great advances in theoretical and computational methods have been made in recent years, low-speed wind tunnel testing remains essential for obtaining the full range of data needed to guide detailed design decisions for many practical engineering problems. This long-awaited Third Edition of William H. Rae, Jr.'s landmark reference brings together essential information on all aspects of low-speed wind tunnel design, analysis, testing, and instrumentation in one easy-to-use resource. Written by authors who are among the most respected wind tunnel engineers in the world, this edition has been updated to address current topics and applications, and includes coverage of digital electronics, new instrumentation, video and photographic methods, pressure-sensitive paint, and liquid crystal-based measurement methods. The book is organized for quick access to topics of interest, and examines basic test techniques and objectives of modeling and testing aircraft designs in low-speed wind tunnels, as well as applications to fluid motion analysis, automobiles, marine vessels, buildings, bridges, and other structures subject to wind loading. Supplemented with real-world examples throughout, Low-Speed Wind Tunnel Testing, Third Edition is an indispensable resource for aerospace engineering students and professionals, engineers and researchers in the automotive industries, wind tunnel designers, architects, and others who need to get the most from low-speed wind tunnel technology and experiments in their work.

Aeroacoustic Measurements

Author : Thomas J. Mueller
Publisher : Springer Science & Business Media
ISBN 13 : 3662050587
Total Pages : 327 pages
Book Rating : 4.6/5 (62 download)

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Book Synopsis Aeroacoustic Measurements by : Thomas J. Mueller

Download or read book Aeroacoustic Measurements written by Thomas J. Mueller and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes recent developments in aeroacoustic measurements in wind tunnels and the interpretation of the resulting data. The reader will find the latest measurement techniques described along with examples of the results.