Simulation of Flow Control with Microjets for Subsonic Jet Noise Reduction

Huet, Maxime; Rahier, Gilles; Vincent, François

doi:10.5772/38005

Cited by 7 publications

(10 citation statements)

References 65 publications

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“…It corresponds to a physical time of 70.20 ms or to a non-physical time of 420 convective time units D/U j . Previous simulations of a similar case 25 have demonstrated that this duration is sufficient to provide a statistical convergence of the flow fields and far-field pressure spectra.…”

Section: Iib1 Numerical Methodsmentioning

confidence: 90%

“…CEDRE is a multi-physics, reactive solver used by researchers and aeronautical industries for engine conception and optimisation, such as combustion, 27, 28 turbine blade cooling 29 and jet noise 25,26,30 for instance. The resolution of the Navier-Stokes equations is made for the conservative variables and is based on a finite volume formulation using a second order upwind space discretization scheme for generalised polyhedral computational grids.…”

Section: Iib1 Numerical Methodsmentioning

confidence: 99%

“…With this approach, the expensive flow simulation is restricted to the jet development area, where turbulence and nonlinear phenomena occur, while the acoustic propagation in a uniform medium is achieved with an affordable radiation formulation. This approach has been successfully used at Onera during the last decade, see for instance Huet et al 25 and Huet. 26…”

Section: Iib Flow Resolutionmentioning

confidence: 97%

“…26 The nozzle being axisymmetric and with a simple shape, it has been possible to construct a grid composed of structured hexahedra solely to bring under control the flow development both in the boundary layers and the jet plume. This approach differs with the one usually performed at Onera, 25,33,34 where the grid combines a non-structured grid to easily discretize the complex nozzle geometry (especially in the presence of a plug, chevrons, a pylon and/or a wing) with a structured patch in the jet plume to locally increase the flow accuracy in the region of turbulence and sound production. The grid is composed of 40 × 10 6 elements.…”

Section: Iib2 Grid Definitionmentioning

confidence: 98%

“…The internal lines of the nozzle are similar to those used in the projects JEAN 23,24 and OSCAR. 25 In order to integrate the PSJs to the geometry for the experiments, the nozzle lip has been increased for the present geometry compared to the JEAN nozzle and has a thickness of 15 mm.…”

Section: Iia Jet Configurationmentioning

confidence: 99%

See 4 more Smart Citations

On the use of Plasma Synthetic Jets for the control of jet flow and noise

Huet¹

2014

20th AIAA/CEAS Aeroacoustics Conference

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The noise generated by an isothermal single stream jet at Mach number Mj = 0.9 and diameter-based Reynolds number ReD = 10 6 is investigated numerically for an unforced configuration and a forced configuration with an active control device. This active flow forcing is performed with 12 Plasma Synthetic Jets (PSJs) located at the nozzle lip and acting on the axisymmetric mode of the shear layer of the main jet with a forcing Strouhal number StF of 0.14. Simulated flow and noise results are validated with comparisons to available experiments performed for identical jet conditions. The noise radiation of the reference, unforced jet is globally well recovered numerically with a limited overestimation of the experimental pressure levels, below 3 dB for most of the observations angles. In the presence of the control, the simulated interaction between the fluid injected by the PSJs and the main flow reproduces very well the development of a large coherent vortex observed experimentally in the jet shear layer. The control is also found to favour the generation of turbulence. It translates for the acoustics to an increase of the broadband noise and of the integrated pressure levels of 1.5 dB in both experiments and simulations.

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Section: Iib1 Numerical Methodsmentioning

confidence: 90%

Section: Iib1 Numerical Methodsmentioning

confidence: 99%

Section: Iib Flow Resolutionmentioning

confidence: 97%

Section: Iib2 Grid Definitionmentioning

confidence: 98%

Section: Iia Jet Configurationmentioning

confidence: 99%

See 3 more Smart Citations

On the use of Plasma Synthetic Jets for the control of jet flow and noise

Huet¹

2014

20th AIAA/CEAS Aeroacoustics Conference

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Additional terms for the use of Ffowcs Williams and Hawkings surface integrals in turbulent flows

2015

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Analysis of noise radiation mechanisms in hot subsonic jet from a validated large eddy simulation solution

2015

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In the framework of jet noise computation, a numerical simulation of a subsonic turbulent hot jet is performed using large-eddy simulation. A geometrical tripping is used in order to trigger the turbulence at the nozzle exit. In a first part, the validity of the simulation is assessed by comparison with experimental measurements. The mean and rms velocity fields show good agreement, so do the azimuthal composition of the near pressure field and the far field spectra. Discrepancies remain close to the nozzle exit which lead to a limited overestimation of the pressure levels in both near and far fields, especially near the 90∘ angular sector. Two point correlation analyses are then applied to the data obtained from the simulation. These enable to link the downstream acoustic radiation, which is the main direction of radiation, to pressure waves developing in the shear layer and propagating toward the potential core end. The intermittency of the downstream acoustic radiation is evidenced and related to the coherent structures developing in the shear layer.

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Simulation of Flow Control with Microjets for Subsonic Jet Noise Reduction

Cited by 7 publications

References 65 publications

On the use of Plasma Synthetic Jets for the control of jet flow and noise

On the use of Plasma Synthetic Jets for the control of jet flow and noise

Additional terms for the use of Ffowcs Williams and Hawkings surface integrals in turbulent flows

Analysis of noise radiation mechanisms in hot subsonic jet from a validated large eddy simulation solution

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