Journal ArticleDOI
Flow-resonant sound interaction in a duct containing a plate, part I: Semi-circular leading edge
M.C. Welsh,A.N. Stokes,R. Parker +2 more
TLDR
In this article, the interaction between flow and flow-induced acoustic resonances near rigid plates with semi-circular leading edges located in a hard-walled duct is described, and the rate of growth of the vortices is determined by an instantaneous Kutta condition applied over part of the cycle.About:
This article is published in Journal of Sound and Vibration.The article was published on 1984-08-08. It has received 65 citations till now. The article focuses on the topics: Leading edge & Trailing edge.read more
Citations
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MonographDOI
Fundamentals of noise and vibration analysis for engineers
M. P. Norton,Denis G. Karczub +1 more
TL;DR: In this paper, the analysis of noise and vibration signals is presented. But the authors focus on a case study of pipe flow noise and vibrations and use it as a diagnostic tool.
Journal ArticleDOI
A review of cross-flow induced vibrations in heat exchanger tube arrays
David S. Weaver,J.A. Fitzpatrick +1 more
TL;DR: In this paper, the state of understanding of the cross flow excitation mechanisms and design guidelines for tube-and-shell heat exchangers are reviewed and the research needs in this field are discussed.
Journal ArticleDOI
Aerodynamic sources of acoustic resonance in a duct with baffles
TL;DR: In this article, the authors used the finite element method and a discrete-vortex model to predict the observed separated flow and the amount of acoustic energy generated is a function of the phase of the acoustic cycle at which the vortex passes the baffle.
Journal ArticleDOI
Flow-resonant sound interaction in a duct containing a plate, II: Square leading edge
A.N. Stokes,M.C. Welsh +1 more
TL;DR: In this article, the interaction between flow and flow-induced acoustic resonances near rigid plates with square leading edges located in a hard-walled duct is described, and a potential flow model for a plate with a square leading edge is developed and the acoustic power generated by vortices, which grow and shed from the leading edge, is calculated as they move through the resonant acoustic field.
Journal ArticleDOI
Review of the physics of enhancing vortex lift by unsteady excitation
J.Z. Wu,Ahmad Vakili,J.M. Wu +2 more
TL;DR: In this article, a review aimed at providing a physical understanding of the crucial mechanisms for obtaining super lift by means of unsteady excitations is presented, with particular attention given to physical problems, including rolled-up vortex layer instability and receptivity, wave-vortex interaction and resonance, nonlinear streaming, instability of vortices behind bluff bodies and their shedding, and vortex breakdown.
References
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Journal ArticleDOI
A simplex method for function minimization
John A. Nelder,R. Mead +1 more
TL;DR: A method is described for the minimization of a function of n variables, which depends on the comparison of function values at the (n 41) vertices of a general simplex, followed by the replacement of the vertex with the highest value by another point.
Journal ArticleDOI
Non‐linear Transformations of Divergent and Slowly Convergent Sequences
TL;DR: In this article, a family of non-linear sequence-to-sequence transformations, ek, ekm, ẽk, and ed, are discussed and a brief history of the transformations is related and a simple motivation for the transforms is given.
Journal ArticleDOI
Contributions to the theory of aerodynamic sound, with application to excess jet noise and the theory of the flute
TL;DR: In this article, a reformulation of the Lighthill (1952) theory of aerodynamic sound is described, and the form of the acoustic propagation operator is established for a non-uniform mean flow in the absence of vortical or entropy gradient source terms.
Journal ArticleDOI
Resonance effects in wake shedding from parallel plates: Some experimental observations
TL;DR: A series of tests with air flowing over a cascade of flat parallel plates has shown that pressure fluctuations occur with amplitudes of the same order of magnitude as the air stream dynamic head as discussed by the authors.