Plate-Angle Effects on Acoustic Waves from Supersonic Jets Impinging on Inclined Plates

Nonomura, Taku; Honda, Hideki; Nagata, Yuki; Yamamoto, Makoto; Morizawa, Seiichiro; Obayashi, Shigeru; Fujii, Kozo

doi:10.2514/1.j054152

Cited by 37 publications

(17 citation statements)

References 36 publications

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“…The acoustic waves (ii) are radiated from the impingement region and propagate in a direction almost perpendicular to the inclined flat plate. This suggestion of Nonomura et al [10] was consistent with the observations of subsequent studies involving similar impinging jets, such as the numerical simulations of Tsutsumi et al [12,13], Brehm et al [14], and Nonomura et al [15] and the experimental works of Worden et al [16,17] and Akamine et al [18,19]. For example, Akamine et al [19] experimentally observed the complicated acoustic waves around the impinging jet, which corresponded to the Mach waves (i) from the free-jet region and acoustic waves (ii) from the impingement region, as shown in the schlieren image in Fig.…”

Section: Introductionsupporting

confidence: 85%

Effect of Nozzle–Plate Distance on Acoustic Phenomena from Supersonic Impinging Jet

Akamine¹,

Okamoto²,

Gee³

et al. 2018

AIAA Journal

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For an adequate understanding of the broadband acoustic phenomena generated by a rocket exhaust jet impinging on a flame deflector, this study experimentally clarifies the factors that cause the difference in the broadband acoustic field of a supersonic ideally expanded jet impinging on an inclined flat plate for various nozzle-plate distances. According to previous studies, there are two possible factors: the Mach waves, which are radiated from the free-jet region and reflected by the plate, and the acoustic waves generated in the impingement region. To distinguish the effects of these factors, this study compares the following three results: the overall sound pressure level distribution, images extracted from the schlieren visualization movies using acoustic-triggered conditional sampling, and tracing lines of the acoustic intensity vectors of the Mach waves. The results reveal that the nozzle-plate distance affects the fraction of the Mach waves that are generated in the free-jet region and reflected by the plate, resulting in a higher overall sound pressure level in the upstream direction for larger nozzle-plate distances. It is concluded that the location of the plate relative to the source region of the Mach waves significantly affects the acoustic phenomena, owing to the variation in the nozzle-plate distances.

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Section: Introductionsupporting

confidence: 85%

Effect of Nozzle–Plate Distance on Acoustic Phenomena from Supersonic Impinging Jet

Akamine¹,

Okamoto²,

Gee³

et al. 2018

AIAA Journal

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“…The variation on the canonical case that has received the most attention is impingement against an angled surface, motivated largely by blast-deflectors on the decks of aircraft carriers. 114–122 From a perspective of resonance, the inclined plate provides the opportunity for many different lengths of feedback path between the plate and the nozzle, particularly if the sound source is located in the wall jet.…”

Section: Supersonic-jet Impingementmentioning

confidence: 99%

Aeroacoustic resonance and self-excitation in screeching and impinging supersonic jets – A review

Edgington-Mitchell

2019

International Journal of Aeroacoustics

172

104

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Supersonic jets, particularly shock-containing jets, often exhibit high-intensity, discrete-frequency acoustic tones. These tones are the signature of an aeroacoustic resonance loop established by the flow. This paper considers two of the classical forms of supersonic jet resonance: screech in shock-containing free jets and tones generated by the impingement of a jet against a surface. The first half of the paper provides a historical perspective on research into both forms of resonance, ranging from the seminal works of Alan Powell to recent contributions from high-fidelity numerical simulation, experiment, and stability theory. The second half of the paper provides a critical assessment of current understanding around the four processes that characterize jet resonance: a downstream propagation of energy, an acoustic generation mechanism, an upstream propagation of energy, and a receptivity mechanism.

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“…For a more comprehensive review of numerical studies of the jet impingement flow-field. [24][25][26] Several other computational investigations have taken different approaches to analyzing the jet impingement problem. Hong and Jeon 27 and Tsutsumi et al 28 implemented a Roe flux splitting scheme and a hybrid LES/RANS scheme, respectively, to resolve the impingement flow-field.…”

Section: Computational and Theoretical Researchmentioning

confidence: 99%

Theoretical investigation of alteration and radiation of large-scale structures due to jet impingement

Miller

Carr

2018

International Journal of Aeroacoustics

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Jet flows impinge on launch pad structures and aircraft carrier deck blast deflectors. Turbulent structures are deformed and acoustic radiation is reflected by the deflector. The coupling of reflected acoustic waves with the instability waves of the jet turbulence increases their amplitude and causes a feedback loop. Resultant far-field acoustic radiation is amplified. This amplification results in additional tones with significant spectral broadening occurring at frequencies corresponding to the constructive interference. We present a simple prediction methodology in the form of an acoustic analogy. The analogy accounts for reflected acoustic waves through a tailored Green's function and models the large-scale structures as spatially and temporarily growing and decaying instability waves. The predictions are compared with two experimental datasets. Predictions compare favorably with measured frequencies and spectral broadening in the far-field.

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Plate-Angle Effects on Acoustic Waves from Supersonic Jets Impinging on Inclined Plates

Cited by 37 publications

References 36 publications

Effect of Nozzle–Plate Distance on Acoustic Phenomena from Supersonic Impinging Jet

Effect of Nozzle–Plate Distance on Acoustic Phenomena from Supersonic Impinging Jet

Aeroacoustic resonance and self-excitation in screeching and impinging supersonic jets – A review

Theoretical investigation of alteration and radiation of large-scale structures due to jet impingement

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