Prediction of Jet Noise From Circular Beveled Nozzles

Paliath, Umesh; Morris, Philip J.

doi:10.2514/6.2005-3096

Cited by 20 publications

(15 citation statements)

References 8 publications

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“…11 Screech noise generation has been studied numerically by Al-Qadi and Scott, 12 Berland et al, 13 and Li and Gao 14 in rectangular, planar, and round underexpanded supersonic jets. Simulations of the sound field obtained from beveled jet nozzles have been also performed by Paliath et al 15 and Viswanathan et al 16 Finally predictions of the noise generated by dual-stream jets have been carried out using LES by Andersson et al, 17 Vuillemin et al, 18 Mihăescu et al, 19 Viswanathan et al, 16 Tristanto et al, 20 and Eschricht et al 21 Dual-stream nozzles are of interest for the aerospace industry. However, knowledge of aerodynamic development and noise generation in these flow configurations still requires extensive research efforts.…”

Section: Introductionmentioning

confidence: 99%

Simulation of a hot coaxial jet: Direct noise prediction and flow-acoustics correlations

et al. 2009

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A coaxial jet originating from parallel coplanar pipe nozzles is computed by a compressible large eddy simulation (LES) using low-dissipation and low-dispersion schemes in order to determine its acoustic field and to study noise generation mechanisms. The jet streams are at high velocities, the primary stream is heated, and the Reynolds number based on the primary velocity and the secondary diameter is around 106. High levels of turbulence intensity are also specified at the nozzle exit. The jet aerodynamic field and the near-pressure field are both obtained directly from the LES. The far-field noise is calculated by solving the linear acoustic equations, from the unsteady LES data on a cylindrical surface surrounding the jet. A good agreement is observed in terms of directivity, levels, and narrow-band spectra with noise measurements carried out during the EU project CoJeN for a coaxial jet displaying same stream velocities and temperatures, coplanar nozzle outlets with identical area ratio, and a high Reynolds number. However, certainly due to differences in the properties of the nozzle-exit boundary layers with respect to the experiment, some unexpected peaks are noticed in the simulation spectra. They are attributed to the development of a Von Kármán street in the inner mixing layer and to vortex pairings in the outer shear layer. High correlation levels are also calculated between the pressure waves radiated in the downstream direction and flow quantities such as axial velocity, vorticity norm, density, and temperature, taken around the end of the primary and secondary potential cores. Noise generation in the coaxial jet therefore appears significant around the end of the two potential cores. These flow regions are characterized by intermittency, a dominant Strouhal number, and variations in the convection velocity as similarly found in single jets. The use of density or temperature to compute flow-noise correlations finally seems appropriate for a heated jet flow, but might lead to correlations with acoustic disturbances in the potential core.

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Section: Introductionmentioning

confidence: 99%

Simulation of a hot coaxial jet: Direct noise prediction and flow-acoustics correlations

et al. 2009

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“…It is noted that the outward-going normal vectors are opposite at the common interface of two neighboring blocks, regardless of the mesh (20) where £2 is the control volume represented by the shaded area. The volume dV of the element and the surface vector dS (pointing to the direction along which the grid indices grow) of the cell faces can be calculated from the coordinates of the vertices [14].…”

Section: New Block Interface Conditionmentioning

confidence: 99%

“…Given the similarity between the inviscid and viscous fluxes in Eq. (20), the viscous fluxes are included in the flux vector F for convenience in the following discussion. The discretized form at the grid point (i, j) is…”

Section: New Block Interface Conditionmentioning

confidence: 99%

Improved Block Interface Conditions for Aeroacoustic Problems with Grid Discontinuities

Morris

2015

AIAA Journal

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Aeroacoustic simulations are extremely sensitive to numerical errors. To achieve a high order of accuracy, optimized finite difference schemes, such as the well-known dispersion-relation-preservation schemes, and multiblock structured meshes are often used. Challenges appear in communicating the flow information near grid discontinuities between neighboring blocks, and sophisticated interface treatments are required. The characteristic interface condition has been successful in applications in previous publications, and yet limitations exist that are identified in the present study. This paper proposes a new interface treatment based on the analogy between finite difference and finite volume discretizations. One-sided finite difference schemes are used to calculate the spatial derivatives in the normal direction, and the residuals are reconstructed from a finite volume perspective. Applications to several benchmark cases show an encouraging improvement as compared to the previous characteristic interface treatments.

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“…Simulations of the sound field obtained from beveled jet nozzles have been also performed by Paliath et al 12 and Viswanathan et al 13 Finally predictions of the noise generated by dual-stream jets have been recently carried out using Large Eddy Simulations by Andersson et al, This paper is organized as follows. The parameters of the Large Eddy Simulation of the coaxial jet and those of the extrapolation of the LES near field in the acoustic far field, including in both cases numerical algorithm, computational grids and times, are documented in section II.…”

Section: Introductionmentioning

confidence: 99%

Direct Computation of the Noise Generated by a Hot Coaxial Jet

Bogey

Bailly

2007

13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)

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A coaxial jet originating from parallel coplanar pipe nozzles is computed by a compressible Large Eddy Simulation (LES) of 1,800 CPU hours on a Nec SX5, using low-dissipation and low-dispersion numerical schemes in order to determine its generated noise. The jet streams are at high velocities, the primary stream is heated, and the Reynolds number based on the primary velocity and the secondary diameter is around 10 6 . High levels of turbulence intensity are also specified at the nozzle exit. The jet aerodynamic development and the near pressure field obtained directly by the LES are presented. The far-field noise is calculated by solving the linear acoustic equations, from the unsteady LES data on cylindrical surfaces surrounding the jet. A good agreement is observed with corresponding noise measurements carried out during the EU CoJeN project in terms of directivity, levels and narrow-band spectra. Some unexpected peaks are however noticed in the simulation spectra, and they are attributed to the development of a Von Karman alley within the inner mixing layer.

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Prediction of Jet Noise From Circular Beveled Nozzles

Cited by 20 publications

References 8 publications

Simulation of a hot coaxial jet: Direct noise prediction and flow-acoustics correlations

Simulation of a hot coaxial jet: Direct noise prediction and flow-acoustics correlations

Improved Block Interface Conditions for Aeroacoustic Problems with Grid Discontinuities

Direct Computation of the Noise Generated by a Hot Coaxial Jet

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