Wall-Pressure Fluctuations Induced by a Compressible Jet in Installed Configuration

Meloni, Stefano; Mancinelli, Matteo; Camussi, Roberto; Huber, Jérôme

doi:10.2514/1.j058791

Cited by 17 publications

(21 citation statements)

References 29 publications

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“…For increasing x/D, see figure 9(c,d), the difference between the annular and pylon spectra decreases until the farthest downstream position close to the wing trailing edge, see figure 9(e,f ), where the wall-pressure spectra of the annular and pylon jets collapse both for the static and in-flight situations. Here, the spectral decay law is close to f −7/3 , which is typical of fully developed turbulence (George et al 1984) and has previously been observed in wall-pressure fluctuation data from fully developed grazing jet flows (Meloni et al 2019(Meloni et al , 2020b.…”

Section: Streamwise Analysissupporting

confidence: 82%

“…Recently, Meloni et al (2019) investigated the wall-pressure field induced by a highly compressible subsonic jet on to an infinite flat plate, providing autospectra and cross-spectra scaling in terms of jet Mach number. Further studies have been performed for small-scale jet-wing-flap configurations, including the presence of a co-flow (Faranosov et al 2019;Meloni et al 2020b) and using a chevron nozzle (Mengle 2012).…”

Section: Introductionmentioning

confidence: 99%

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An experimental investigation into model-scale installed jet–pylon–wing noise

et al. 2021

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A model-scale experimental investigation of an installed jet–pylon–wing configuration was conducted at the University of Southampton, with the scope to study the effect a pylon has on noise generation and to clarify its impact on the fluctuating wall-pressure load. The set-up consisted of two single-stream nozzles, a baseline axisymmetric annular nozzle and a partially blocked annular pylon nozzle. The nozzles were tested first isolated and then installed next to a NACA4415 aerofoil ‘wing’ at a single nozzle–wing position. The jet Mach number was varied between $0.5 \leq M_{{j}} \leq 0.8$ and measurements were performed both under static and in-flight ambient flow conditions up to ${M_{{f}} = 0.2}$ . The jet flow-field qualification was carried out using a single-velocity-component hot-wire anemometer probe. The pressure field on the wing surface was investigated using two miniature wall-pressure transducers that were flush-mounted in the streamwise and spanwise directions within the pressure side of the wing. A linear ‘flyover’ microphone array was used to record the noise radiated to the far field. The unsteady pressure data were analysed in both time and frequency domains using multi-variate statistics, highlighting a far-field noise reduction provided by the presence of the pylon only in the installed case. Furthermore, the wake field generated behind the pylon is seen to significantly modify the wall-pressure fluctuations, particularly at streamwise locations close to the pylon trailing edge.

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Section: Streamwise Analysissupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

An experimental investigation into model-scale installed jet–pylon–wing noise

et al. 2021

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“…Similar results are also shown in a small-scale jet-wing-flap configuration. 5 In cases (c) and (d), the oscillations disappear and the peak is at positive time delays. For increasing x/D the cross-correlation coefficients tend to broaden describing the large-scale turbulent structures induced by the jet.…”

Section: Resultsmentioning

confidence: 96%

“…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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“…Recently, research has been carried out on installed jets based on realistic jet-wing geometries. Most efforts have been directed at detailed investigations of the far-field pressure from installed jet configurations (Lawrence et al 2011;Brown 2013;Cavalieri et al 2014;Khavaran 2015;Zaman et al 2015;Faranosov et al 2019;Meloni et al 2020). Jet installation effects for relatively simple flat plate surface geometries and single stream jet flows are reasonably well understood and various jet-surface interaction noise models have been successfully developed (Lyu et al 2017;Vera 2018;Bychkov and Faranosov 2018;Dawson et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Investigation into the turbulence statistics of installed jets using hot-wire anemometry

2020

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This work presents a detailed study of the turbulence flow statistics of a jet mounted with its axis parallel to a rigid flat plate. Hot-wire constant temperature anemometry has been used to measure the single-point and two-point statistics of the axial velocity component at several locations within the jet flow field. Results show that the jet mean flow near the plate surface is subjected to a local acceleration and redirection due to a Coandă-type effect. The propagation of these effects downstream of the plate trailing edge is strongly dependent on the plate position. Regarding the velocity fluctuations, the mean turbulence intensity levels are seen to decrease as the radial distance between the jet and surface decreases. Analysis of the single-point power spectral density data on the shear layer close to the plate shows that the reduction in magnitude of the low-frequency content of the energy spectrum is responsible for the decrease in turbulence intensity. Additionally, the characteristic time and length scales computed from two-point measurements reduce as the plate is mounted closer to the jet centre-line. The axial eddy convection velocity is seen to increase in the region of high turbulent kinetic energy in the shear layer adjacent to the surface. Empirical models for turbulence characteristic scales and eddy convection velocity are presented. These findings suggest that both the amplitude and distribution of the jet mixing noise sources are affected when closely installed next to a surface. This paper is a continuation of a recent investigation on the turbulence statistics of isolated jets presented in Proença (Exp Fluids 60(4):63, 2019). Graphic abstract

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Wall-Pressure Fluctuations Induced by a Compressible Jet in Installed Configuration

Cited by 17 publications

References 29 publications

An experimental investigation into model-scale installed jet–pylon–wing noise

An experimental investigation into model-scale installed jet–pylon–wing noise

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

Investigation into the turbulence statistics of installed jets using hot-wire anemometry

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