Cross-correlations of far field azimuthal modes in subsonic jet noise

Kopiev, V. F.; Zaitsev, M. Yu.; Velichko, Sergey; Kotova, A.; Belyaev, I. V.

doi:10.2514/6.2008-2887

Cited by 16 publications

(19 citation statements)

References 7 publications

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“…At the same time, there are also grounds to disregard the correlation of fields ξ n with different n for nonlinear turbulence pulsations. This follows from the experimental results in [12], which demonstrate an insignificant mutual correlation between the different azimuthal harmonics of acoustic far field radiation. Based on LES calculation for a turbulent jet, it was shown in [3] that the cross correlation coefficients of the Reynolds stress tensor components are character ized by relatively low values.…”

Section: Acoustic Radiation By a Random Field Of Quadrupole Sourcessupporting

confidence: 64%

“…the same time, similar to the approach based on monopole sources [1], such an approach is also incon sistent with experimental data [8,12], which indicate the quadrupole character of acoustic radiation. At first glance, the quadrupole character of acous tic radiation contradicts the fact that when the integral noise of the turbulent jet is measured by a single microphone (without preliminary harmonic decom position of a signal), sound radiation appears close to isotropic.…”

Section: Acoustic Radiation By a Random Field Of Quadrupole Sourcesmentioning

confidence: 71%

“…At the same time, the contri bution of the monopole source to jet noise is likely insignificant. This is evident, for example, from the experimental data on jet noise [8,12] obtained by the azimuthal decomposition method, which indicate the quadrupole character of acoustic radiation. Therefore, the monopole source is not considered in this work.…”

Section: Acoustic Radiation By a Random Field Of Quadrupole Sourcesmentioning

confidence: 85%

“…The spectra calculated in compliance with the three proposed models are compared with the experi mental data on noise produced by a circular jet with a velocity of V = 120 m/s [12]. It is shown that the third model yields the best consistency with experimental data.…”

Section: Introductionmentioning

confidence: 82%

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New correlation model for the cascade of turbulent pulsations as a noise source in jets

Kopiev

Chernyshev

2012

Acoust. Phys.

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The mechanisms of noise generation by turbulent jets associated with a cascade of turbulent per turbations are considered from generation of primary eddies to their disintegration. A new correlation model proposed for describing these mechanisms is based on simulation of their generation as a random process with deterministic description of individual eddies. The model makes it possible to analyze available correlation models based on experimental modeling of the correlation function: monopoles, dipoles, or quadrupoles. The main difference between these models is both the different multipole structure of assumed sources and implicit "hard" and "soft" variants of source generation, as well as in the main variable for which the corre lation function is developed. This approach is used for developing the correlation model of the noise genera tion mechanism related to oscillations of surface eddies. The jet noise inferred from the proposed model is well consistent with experimental data on circular jet noise.

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Section: Acoustic Radiation By a Random Field Of Quadrupole Sourcessupporting

confidence: 64%

Section: Acoustic Radiation By a Random Field Of Quadrupole Sourcesmentioning

confidence: 71%

Section: Acoustic Radiation By a Random Field Of Quadrupole Sourcesmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 82%

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New correlation model for the cascade of turbulent pulsations as a noise source in jets

Kopiev

Chernyshev

2012

Acoust. Phys.

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“…In order to evaluate the possibility of measuring the noise of the turbulent jet in the anechoic chamber, the obtained measurement results had to be compared with the known results of similar tests in another anechoic chamber. For this purpose, it was used the results of measurements in anechoic chamber AC-2 TsAGI, which were performed for the jet rig with nozzle diameter D = 40 mm with a 6-microphones array of 0.85 m radius (figure 4) within the investigation of the azimuthal decomposition of turbulent jet noise [8]. From the data set, the points with coordinates θ = 30°, R = 1.7 m and θ = 90°, R = 0.85 m were taken.…”

Section: Measurements Of the Jet Noisementioning

confidence: 99%

Aeroacoustic investigations of subsonic jet in PNRPU anechoic chamber

Palchikovskiy

Khramtsov

Ershov

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.A study of the aeroacoustic characteristics of the PNRPU jet rig is considered. The design of the jet rig is described. The velocity of the jet along the axis is measured at a certain distance from the nozzle exit section. The comparison of the velocity with a semi-empirical model is performed. A good agreement of the velocities is observed. The noise of the jet is measured for different velocities in the direction of 30 and 90 degrees. The obtained spectra are compared with the results of measurements of the jet rig in the anechoic chamber AC-2 TsAGI. Localization of the noise sources of the jet with the Bruel & Kjaer microphone array is also carried out. The investigations are carried out in a new anechoic chamber at PNRPU.

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