Journal ArticleDOI
Effect of impingement surface roughness on the noise from impinging jets
TLDR
In this paper, the effects of roughness of the impingement plate widens the staging region of noise and the effect of nozzle-to-plate spacing distance and nozzle pressure ratio are investigated.Abstract:
This paper presents extensive acoustic measurements on jets impinging on surfaces of various surface roughness values. Besides surface roughness, the effects of nozzle-to-plate spacing distance and nozzle pressure ratio are also investigated. Turbulent mixing noise and tonal noise are explained using far-field wall-jet velocity and impingement region temperature fields. The results demonstrate that roughness of the impingement plate widens the staging region of impingement noise. In general, high speed jet impinging on a rough plate generates less noise compared to a smooth plate. When tones are removed from the spectra, it is found that acoustic power monotonically decreases with increasing surface roughness. Thermal imaging in the stagnation region indicates that whenever tones are present, the temperature at the stagnation region is high. Further, sound pressure directivity pattern of impingement noise is constructed by superimposing a wall-jet and a free jet in the appropriate orientations.read more
Citations
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Journal ArticleDOI
A review of impinging jets during rocket launching
TL;DR: In this article, the authors present an overview on progress and perspectives of the jet impingement research for rocket launching and discuss the interaction of impinging jets with multiphase flows.
Journal ArticleDOI
Analysis of the performance of a new developed shear stress transport model in a turbulent impinging jet flow
TL;DR: In this article, a developed Shear Stress Transport (SST) model has been used for numerically simulating the problem of turbulent round jet impingement heat transfer, and the results showed that the inner peak of heat transfer is connected with the radial pressure gradient at the stagnation point.
Journal ArticleDOI
Sound source mechanisms in under-expanded impinging jets
TL;DR: In this paper, an under-expanded supersonic jet impinging on a flat plate is investigated by means of acoustic, particle image velocimetry and wall pressure measurements.
Journal ArticleDOI
A review on multiple liquid jet impingement onto flat plate
Shikshit Nawani,Maharshi Subhash +1 more
TL;DR: In this article, the authors summarized the state of the art of the process of multiple jet impingement onto flat plate and highlight the future scope of research space in this field.
Journal ArticleDOI
Experimental investigation of heat transfer of impinging jet on a roughened plate by a micro cubic shape
TL;DR: In this article, an experimental study of average heat transfer from air jet impinging on a rough plate by a micro cubic pin is investigated, and the main objective of the present study is to investigate the effect of...
References
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Journal ArticleDOI
Oscillatory Behavior of Supersonic Impinging Jet Flows
Sung In Kim,Seung O Park +1 more
TL;DR: In this article, the authors focused on the oscillatory flow features associated with the variation of the nozzle-to-plate distance and nozzle pressure ratio and found that the staging behavior is strongly correlated with the change of the pressure wave pattern in the jet shear layer, but not with the shock cell structure.
Journal ArticleDOI
Flow dynamics and mass transfer in impinging circular jet at low Reynolds number. Comparison of convergent and orifice nozzles
Amina Meslem,Vaclav Sobolik,Florin Bode,Kodjovi Sodjavi,Yassine Zaouali,Ilinca Nastase,Cristiana Croitoru +6 more
TL;DR: In this paper, the authors used DMD and Particle Image Velocimetry (PIV) measurements in two impinging jets, the first exiting from a convergent nozzle and the second from a square-edged orifice nozzle having same exit diameter.
Journal ArticleDOI
Role of initial conditions on noise from underexpanded pipe jets
T. J. S. Jothi,K.N. Srinivasan +1 more
TL;DR: In this paper, an experimental investigation of acoustic radiation from underexpanded air jets of different shear layer thicknesses has been performed, and the authors characterized the acoustic radiation in terms of overall sound pressure level, directivity, tonal, and broadband shock associated noise.
Journal ArticleDOI
Upstream influence on turbulent jet flows from cruciform nozzles
W. R. Quinn,G. F. Marsters +1 more
TL;DR: In this paper, the effects of nozzle geometry on the performance of an axisymmetric thrust augmentor have been investigated experimentally and a very slight improvement in the performance was observed when cruciform nozzles were used after the tests had been performed with circular nozzle.
Journal ArticleDOI
Pressure measurements on the impingement surface of sonic and sub-sonic jets impinging onto a flat plate at inclined angles
TL;DR: In this paper, the authors used pressure sensitive paint (PSP) and particle image velocimetry to measure the pressure field associated with a jet impinging onto a surface at an inclined angle.