Pressure and Velocity Measurements of a Compressible Jet Interacting with a Flat Plate

Meloni, Stefano; Marco, Alessandro Di; Paola, Elisa de; Camussi, Roberto; Fava, Gianluca

doi:10.1007/978-3-030-22196-6_43

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…where σ p is the standard deviation of the pressure signal, P ref is the reference sound pressure in the air (20 μPa) 24 , Re D is the nozzle exhaust Reynolds number and k is the exponent of the Reynolds number that depends on the jet-surface interaction relevance, and thus on the jet-plate interaction zones (see e.g. 13,21 ). The nozzle exhaust Reynolds number, Re D , has been evaluated as follows:…”

Section: Resultsmentioning

confidence: 99%

“…According to e.g. 13,19,21 , three jet-surface interaction zones can be distinguished: in the first zone, at low x/D, the jet has not yet impinged on the plate; the second zone corresponds to the region where the jet starts to interact with the plate downstream of the impact point; in the third zone, at large x/D, a TBL-like behaviour is found. The velocity field as well as the jet impact point have been evaluated in previous works on the same configuration and Mach number (see e.g.…”

Section: Resultsmentioning

confidence: 99%

“…It should be pointed out that, as reported in 13,15,19,20 , the jet-plate distance is a driving parameter of the physics of the jet-surface interaction. Specifically, for large jet-plate distances the plate effect on the aerodynamic field is expected to be weak 19,21,22 as well as the jet footprint on the surface. On the contrary, for the closest-coupled configuration (H/D = 0.75) the jet-surface interaction phenomena are more significant leading to the development of a turbulent boundary layer (TBL)-like zone on the plate far downstream of the nozzle exhaust.…”

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confidence: 99%

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Experimental investigation of jet-induced wall pressure fluctuations over a tangential flat plate at two Reynolds numbers

Meloni¹,

Marco²,

Mancinelli

et al. 2020

Sci Rep

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The wall pressure fluctuations induced by a subsonic circular jet on a rigid flat plate have been investigated considering two jets with different exit section diameters at the same Mach number. The analysis is aimed at completing the series of papers presented by the authors on the interaction between a subsonic jet and infinite tangential flat plate where the exit Mach number was the only parameter of the jet flow that was varied. In order to analyse other effects out of the Mach number, two configurations with different nozzle exhaust diameters were explored with the objective of isolating the Reynolds number effect keeping fixed the exit Mach number. The nozzle exhaust diameters are 12 mm and 25.4 mm and the instrumented flat plate, installed parallel to the jet flow, is moved at different radial distances from the jet axis. The pressure footprint on the plate has been measured in the stream-wise direction by means of a pair of flush-mounted pressure transducers, providing point-wise pressure signals. Wall pressure fluctuations have been characterised in terms of spectral and statistical quantities. The effect of Reynolds is evidenced and possible scaling relationships that account for the Reynolds dependence are proposed. Implications for modeling the spectral coherence have been considered by the application of the Corcos’ model and the effect of the jet Reynolds number on the model coefficients is analyzed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation of jet-induced wall pressure fluctuations over a tangential flat plate at two Reynolds numbers

Meloni¹,

Marco²,

Mancinelli

et al. 2020

Sci Rep

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“…For these reasons, many experimental and numerical studies have been carried out in the last few years to investigate installation noise. [2][3][4][5][6][7] Studies on simplified jet-flat plate configurations remain important to provide fundamental physical understandings both from the aerodynamic [8][9][10][11] and the acoustic standpoint. To this extent, the shielding/scattering effect of the airframe surface have been investigated by researchers 12,13 whereas near-field and far-field noise generated by a jet installed close to a semi-finite plate has been analyzed by Lawrence et al 14 Wall pressure fluctuations induced by the jet over an infinite flat plate have been extensively investigated in literature 8,[15][16][17][18] for the prediction of the vibro-acoustic response of the aircraft surfaces.…”

Section: Introductionmentioning

confidence: 99%

Wall pressure fluctuations induced by a single stream jet over a semi-finite plate

Meloni

Lawrence

Proenca

et al. 2020

International Journal of Aeroacoustics

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This work provides an experimental investigation into the interaction between a jet flow and a semi-finite plate parallel to the jet. Wall pressure fluctuations have been measured in a high compressible subsonic regime and for different distances between the jet and the plate trailing edge. The experiment has been carried out in the ISVR anechoic Doak Laboratory at the University of Southampton, using wall pressure transducers flush mounted on the plate surface. Signals were acquired in the stream-wise direction along the jet centreline and in the span-wise direction in a region close to the trailing edge. The radial position of the flat plate was fixed very close to the jet axis to simulate a realistic jet–wing configuration. The plate was moved axially in order to investigate four different jet-trailing edge distances and to include measurements upstream of the nozzle exhaust. The acquired database was analyzed in both the frequency and the time domains providing an extensive statistical characterization in terms of spectral uni– and multi–variate quantities as well as high order statistical moments. A wavelet analysis was performed as well to investigate the time evolution of the wall pressure events.

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“…Guj' Fluid Dynamic laboratory at the University Roma Tre. The acoustically treated chamber measures 2m-high, 4m-long, 3m-wide and has wooden-insulated walls covered with soundabsorbent panels (further details are in [2,14]). A jet with a nozzle connected to an air duct through a pressure regulator is installed in this environment.…”

Section: Introductionmentioning

confidence: 99%

On the Wall Pressure Fluctuations induced by a Supersonic Jet over the Wing pressure side

Meloni

Paola

Curcio³

et al. 2022

J. Phys.: Conf. Ser.

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Supersonic jet wing integrated configurations are expected to be relatively louder than subsonic installed configurations, increasing the wall pressure load transmitted inside the fuselage and stressing the wing/fuselage panels with very energetic and frequency localized supersonic effects. In this framework, a model-scale experimental investigation of an installed jet-wing configuration has been performed using a supersonic convergent-divergent nozzle interacting with a wing generated by a NACA4415 airfoil. The measurements have been carried out in the semi-anechoic chamber of the “G.Guj” Fluid Dynamic laboratory at the University Roma Tre. Wall pressure fluctuations are acquired at different axial locations in stream-wise and span-wise directions. Measurements are repeated for different wing radial positions and by varying the NPR between 2.2 and 2.6, thus exploring both over-expanded and under-expanded jet flow conditions. The flow features that characterize the different flow regimes were caught using the Background Oriented Schlieren (BOS) technique. Fluctuating pressure data, acquired with flush-mounted pressure transducers, were analysed in the frequency domain, considering a Fourier-based approach. A comparison of results obtained with an infinite flat plate has been used to highlight effects generated by the discontinuity related to the trailing edge.

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Pressure and Velocity Measurements of a Compressible Jet Interacting with a Flat Plate

Cited by 8 publications

References 7 publications

Experimental investigation of jet-induced wall pressure fluctuations over a tangential flat plate at two Reynolds numbers

Experimental investigation of jet-induced wall pressure fluctuations over a tangential flat plate at two Reynolds numbers

Wall pressure fluctuations induced by a single stream jet over a semi-finite plate

On the Wall Pressure Fluctuations induced by a Supersonic Jet over the Wing pressure side

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