Hostname: page-component-848d4c4894-wzw2p Total loading time: 0 Render date: 2024-05-23T14:55:22.343Z Has data issue: false hasContentIssue false
  • English
  • Français

Multivariate and conditioned statistics of velocity and wall pressure fluctuations induced by a jet interacting with a flat plate

Published online by Cambridge University Press:  15 June 2017

Matteo Mancinelli Open the ORCID record for Matteo Mancinelli [Opens in a new window] ,
Alessandro Di Marco  and
Roberto Camussi
Matteo Mancinelli*
Affiliation:
Dipartimento di Ingegneria, Università degli Studi Roma Tre, Via della Vasca Navale 79, 00146 Rome, Italy
Alessandro Di Marco
Affiliation:
Dipartimento di Ingegneria, Università degli Studi Roma Tre, Via della Vasca Navale 79, 00146 Rome, Italy
Roberto Camussi
Affiliation:
Dipartimento di Ingegneria, Università degli Studi Roma Tre, Via della Vasca Navale 79, 00146 Rome, Italy
*
†Email address for correspondence: matteo.mancinelli@uniroma3.it
Get access Rights & Permissions [Opens in a new window]

Abstract

The increasing size of aircraft engines is leading to reconsideration of their conventional integration in the under-wing configuration due to the strong interaction between the jet and the airframe components. As a consequence, more insight is needed into the complex mechanisms underlying the interaction phenomenon between the jet flow and a surface. The objective of this paper is to carry out a series of experimental tests on a simplified laboratory-scale model to approach/deepen the problem. This analysis is the continuation of a previous study (Di Marco et al., J. Fluid Mech., vol. 770, 2015, pp. 247–272) on a rigid flat plate installed tangentially to the axis of an incompressible jet. In the present work, the velocity and wall pressure fields were simultaneously measured for different radial distances of the plate from the nozzle axis. Pointwise hot-wire anemometer measurements were carried out to characterize the effect of the plate on the velocity field statistics up to the fourth-order moment. The analysis revealed that the presence of the plate brings about a deflection of the mean aerodynamic field over the surface and a reduction of the turbulence intensity. Wall pressure fluctuations induced by the jet flow over the plate were measured by a linear array of cavity-mounted microphones placed along the streamwise direction. The velocity/pressure cross-statistics are achieved in the time and frequency domains using cross-correlations and Fourier analysis. A wavelet-based conditional sampling procedure is applied as well to characterize the flow signatures related to the velocity and wall pressure fluctuations, revealing that the surface induces the breakdown of the large-scale turbulent structures. The dependence of the multivariate and conditioned statistics on the plate distance from the jet as well as on the streamwise and crosswise probe positions is extensively discussed. Different organized flow motions over the surface are found based on the wall pressure events detected. A scaling criterion for velocity signatures is also presented addressing the governing parameters of the jet–plate interaction phenomenon.

JFM classification

Acoustics: Aeroacoustics Wakes/Jets: Jets
Type
Papers
Information
Journal of Fluid Mechanics , Volume 823 , 25 July 2017 , pp. 134 - 165
Check for updates
Copyright
© 2017 Cambridge University Press 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Amiet, R. K. 1975 Acoustic radiation from an airfoil in a turbulent stream. J. Sound Vib. 41 (4), 407–420.CrossRefGoogle Scholar
Amiet, R. K. 1976 Noise due to turbulent flow past a trailing edge. J. Sound Vib. 47 (3), 387–393.Google Scholar
Bogey, C., Marsden, O. & Bailly, C. 2012 Effects of moderate Reynolds numbers on subsonic round jets with highly disturbed nozzle-exit boundary layers. Phys. Fluids 24 (10), 105107.Google Scholar
Bourque, C. & Newman, B. G. 1960 Reattachment of a two-dimensional, incompressible jet to an adjacent flat plate. Aeronaut. Q. 11 (3), 201–232.Google Scholar
Brown, C. A. 2013 Jet–surface interaction test: far-field noise results. Trans. ASME J. Engng Gas Turbines Power 135 (7), 071201.Google Scholar
Brown, C. & Wernet, M.2014 Jet–surface interaction test: flow measurement results. In 20th AIAA/CEAS Aeroacoustics Conference, AIAA paper 2014-3198. American Institute of Aeronautics and Astronautics.CrossRefGoogle Scholar
Camussi, R., Grilliat, J., Caputi Gennaro, G. & Jacob, M. C. 2010 Experimental study of a tip leakage flow: wavelet analysis of pressure fluctuations. J. Fluid Mech. 660, 87–113.Google Scholar
Camussi, R. & Guj, G. 1997 Orthonormal wavelet decomposition of turbulent flows: intermittency and coherent structures. J. Fluid Mech. 348, 177–199.CrossRefGoogle Scholar
Camussi, R. & Guj, G. 1999 Experimental analysis of intermittent coherent structures in the near field of a high Re turbulent jet flow. Phys. Fluids 11 (2), 423–431.Google Scholar
Camussi, R., Robert, G. & Jacob, M. C. 2008 Cross-wavelet analysis of wall pressure fluctuations beneath incompressible turbulent boundary layers. J. Fluid Mech. 617, 11–30.CrossRefGoogle Scholar
Cavalieri, A. V. G., Jordan, P., Wolf, W. R. & Gervais, Y. 2014 Scattering of wavepackets by a flat plate in the vicinity of a turbulent jet. J. Sound Vib. 333 (24), 6516–6531.CrossRefGoogle Scholar
Chatellier, L. & Fitzpatrick, J. 2005 Spatio-temporal correlation analysis of turbulent flows using global and single-point measurements. Exp. Fluids 38 (5), 563–575.Google Scholar
Corcos, G. M. 1963 Resolution of pressure in turbulence. J. Acoust. Soc. Am. 35 (2), 192–199.Google Scholar
Daubechies, I. 1992 Ten Lectures on Wavelets, vol. 61. SIAM.Google Scholar
Dhanak, M. R., Dowling, A. P. & Si, C. 1997 Coherent vortex model for surface pressure fluctuations induced by the wall region of a turbulent boundary layer. Phys. Fluids 9 (9), 2716–2731.Google Scholar
Di Marco, A., Camussi, R., Bernardini, M. & Pirozzoli, S. 2013 Wall pressure coherence in supersonic turbulent boundary layers. J. Fluid Mech. 732, 445–456.Google Scholar
Di Marco, A., Mancinelli, M. & Camussi, R. 2015 Pressure and velocity measurements of an incompressible moderate Reynolds number jet interacting with a tangential flat plate. J. Fluid Mech. 770, 247–272.Google Scholar
Farabee, T. M. & Casarella, M. J. 1991 Spectral features of wall pressure fluctuations beneath turbulent boundary layers. Phys. Fluids 3 (10), 2410–2420.Google Scholar
Farge, M. 1992 Wavelet transforms and their applications to turbulence. Annu. Rev. Fluid Mech. 24 (1), 395–458.Google Scholar
Fuchs, H. V. 1972 Space correlations of the fluctuating pressure in subsonic turbulent jets. J. Sound Vib. 23 (1), 77–99.Google Scholar
Grizzi, S. & Camussi, R. 2012 Wavelet analysis of near-field pressure fluctuations generated by a subsonic jet. J. Fluid Mech. 698, 93–124.Google Scholar
Guj, G., Carley, M., Camussi, R. & Ragni, A. 2003 Acoustic identification of coherent structures in a turbulent jet. J. Sound Vib. 259 (5), 1037–1065.Google Scholar
Henning, A., Koop, L. & Schröder, A. 2013 Causality correlation analysis on a cold jet by means of simultaneous particle image velocimetry and microphone measurements. J. Sound Vib. 332 (13), 3148–3162.Google Scholar
Huber, J., Drochon, G., Pintado-Peno, A., Cléro, F. & Bodard, G.2014 Large-scale jet noise testing, reduction and methods validation ‘exejet’: 1. Project overview and focus on installation. In 20th AIAA/CEAS Aeroacoustics Conference, AIAA paper 2014-3032. American Institute of Aeronautics and Astronautics.CrossRefGoogle Scholar
Huber, J., Omais, M., Vuillemin, A. & Davy, R.2009 Characterization of installation effects for HBPR engine. Part IV: Assessment of jet acoustics. In 15th AIAA/CEAS Aeroacoustics Conference, AIAA paper 2009-3371. American Institute of Aeronautics and Astronautics.CrossRefGoogle Scholar
Jayasundera, S., Casarella, M. & Russell, S.1996 Identification of coherent motions using wall pressure signatures. Tech. Rep. DTIC Document.Google Scholar
Johansson, A. V., Her, J. & Haritonidis, J. H. 1987 On the generation of high-amplitude wall-pressure peaks in turbulent boundary layers and spots. J. Fluid Mech. 175, 119–142.Google Scholar
Lau, J. C., Fisher, M. J. & Fuchs, H. V. 1972 The intrinsic structure of turbulent jets. J. Sound Vib. 22 (4), 379–406.Google Scholar
Launder, B. E. & Rodi, W. 1983 The turbulent wall jet measurements and modeling. Annu. Rev. Fluid Mech. 15 (1), 429–459.CrossRefGoogle Scholar
Lawrence, J. L. T., Azarpeyvand, M. & Self, R. H.2011 Interaction between a flat plate and a circular subsonic jet. In 17th AIAA/CEAS Aeroacoustics Conference, AIAA paper 2011-2745. American Institute of Aeronautics and Astronautics.Google Scholar
Mallat, S. G. 1989 A theory for multiresolution signal decomposition: the wavelet representation. Pattern Anal. Mach. Intell. 11 (7), 674–693.CrossRefGoogle Scholar
Mancinelli, M., Di Marco, A. & Camussi, R.2016a Cross-statistical and wavelet analysis of velocity and wall-pressure fields in jet–surface interaction. In 22nd AIAA/CEAS Aeroacoustics Conference, AIAA paper 2016-2861. American Institute of Aeronautics and Astronautics.Google Scholar
Mancinelli, M., Pagliaroli, T., Di Marco, A., Camussi, R. & Castelain, T. 2017 Wavelet decomposition of hydrodynamic and acoustic pressures in the near field of the jet. J. Fluid Mech. 813, 716–749.Google Scholar
Mancinelli, M., Pagliaroli, T., Di Marco, A., Camussi, R., Castelain, T. & Léon, O.2016b Hydrodynamic and acoustic wavelet-based separation of the near-field pressure of a compressible jet. In 22nd AIAA/CEAS Aeroacoustics Conference, AIAA paper 2016-2864. American Institute of Aeronautics and Astronautics.Google Scholar
Meyers, S. D., Kelly, B. G. & O’Brien, J. J. 1993 An introduction to wavelet analysis in oceanography and meteorology: with application to the dispersion of Yanai waves. Mon. Weath. Rev. 121 (10), 2858–2866.2.0.CO;2>CrossRefGoogle Scholar
Pagliaroli, T., Camussi, R., Giacomazzi, E. & Giulietti, E. 2015 Velocity measurement of particles ejected from a small-size solid rocket motor. J. Propul. Power 31 (6), 1777–1784.Google Scholar
Papamoschou, D. & Mayoral, S.2009 Experiments on shielding of jet noise by airframe surfaces. In 15th AIAA/CEAS Aeroacoustics Conference, AIAA paper 2009-3326. American Institute of Aeronautics and Astronautics.CrossRefGoogle Scholar
Piantanida, S., Jaunet, V., Huber, J., Wolf, W., Jordan, P. & Cavalieri, A. V. G.2015 Scattering of turbulent-jet wavepackets by a swept trailing edge. In 21st AIAA/CEAS Aeroacoustics Conference, AIAA paper 2015-2998. American Institute of Aeronautics and Astronautics.Google Scholar
Picard, C. & Delville, J. 2000 Pressure velocity coupling in a subsonic round jet. Intl J. Heat Fluid Flow 21 (3), 359–364.CrossRefGoogle Scholar
Podboy, G. G. 2012 Jet–surface interaction test: phased array noise source localization results. In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, pp. 381–414. American Society of Mechanical Engineers.Google Scholar
Torrence, C. & Compo, G. P. 1998 A practical guide to wavelet analysis. Bull. Am. Meteorol. Soc. 79 (1), 61–78.Google Scholar
Vera, J., Lawrence, J. L. T., Self, R. H. & Kingan, M.2015 The prediction of the radiated pressure spectrum produced by jet–wing interaction. In 21st AIAA/CEAS Aeroacoustics Conference, AIAA paper 2015-2216. American Institute of Aeronautics and Astronautics.CrossRefGoogle Scholar
Wille, R. & Fernholz, H. 1965 Report on the first European mechanics colloquium on the Coanda effect. J. Fluid Mech. 23 (4), 801–819.Google Scholar