Study of three-stream laboratory jets with passive mixing enhancements for noise reduction

Kenzakowski, D. C.; Shipman, Jeremy; Dash, S. M.; Bridges, Jackie; Saiyed, Naseem H.

doi:10.2514/6.2000-219

Cited by 24 publications

(9 citation statements)

References 2 publications

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“…Many RANS solutions for this type of application have been performed, for example, Kenzakowski et al [15], Thomas et al. [29], Engblom et al [9], and Massey et al [18].…”

Section: Introductionmentioning

confidence: 98%

Numerical Simulation of Single-Stream Jets from a Serrated Nozzle

Xia

Tucker

2011

Flow Turbulence Combust

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Hybrid large-eddy type simulations for cold jet flows from a serrated nozzle are performed at an acoustic Mach number Ma ac = 0.9 and Re = 1.03 × 10 6 . Since the solver being used tends towards having dissipative qualities, the subgrid scale (SGS) model is omitted, giving a numerical type LES (NLES) or implicit LES (ILES) reminiscent procedure. To overcome near wall streak resolution problems a near wall RANS (Reynolds averaged Navier-Stokes) model is smoothly blended to the LES making a hybrid RANS-ILES. The geometric complexity of the serrated nozzle is fully considered without simplification or emulation. An improved but still modest hexahedral multi-block grid with circa 20 million grid points (with respect to 12.5 million in Xia et al., Int J Heat Fluid Flow 30:1067-1079) is used. Despite the modest grid size, encouraging and improved results are obtained. Directly resolved mean and second-order fluctuating quantities along the jet centerline and in the jet shear layer compare favorably with measurements. The radiated far-field sound predicted using the Ffowcs Williams and Hawkings (FW-H) surface integral method shows good agreement with the measurements in directivity and sound spectra.

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“…Many RANS solutions for this type of application have been performed, for example, Kenzakowski et al [15], Thomas et al. [29], Engblom et al [9], and Massey et al [18].…”

Section: Introductionmentioning

confidence: 98%

Numerical Simulation of Single-Stream Jets from a Serrated Nozzle

Xia

Tucker

2011

Flow Turbulence Combust

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“…To clearly show the mixing effects of the chevron core and the pylon, a non-dimensionalized, mass averaged turbulence kinetic energy and total temperature expressions are introduced, shown in Figures 18 and 19 respectively. The expressions follow those published by Kenzakowski et al 11 and are defined as follows:k where…”

Section: Cfd Validationmentioning

confidence: 99%

Computational and Experimental Flowfield Analyses of Separate Flow Chevron Nozzles and Pylon Interaction

Massey¹,

Thomas

Abdol-Hamid

et al. 2003

9th AIAA/CEAS Aeroacoustics Conference and Exhibit

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A computational and experimental flow field analyses of separate flow chevron nozzles is presented. The goal of this study is to identify important flow physics and modeling issues required to provide highly accurate flow field data which will later serve as input to the Jet3D acoustic prediction code. Four configurations are considered: a baseline round nozzle with and without a pylon, and a chevron core nozzle with and without a pylon. The flow is simulated by solving the asymptotically steady, compressible, Reynolds-averaged Navier-Stokes equations using an implicit, up-wind, flux-difference splitting finite volume scheme and standard two-equation k − ε turbulence model with a linear stress representation and the addition of a eddy viscosity dependence on total temperature gradient normalized by local turbulence length scale. The current CFD results are seen to be in excellent agreement with Jet Noise Lab data and show great improvement over previous computations which did not compensate for enhanced mixing due to high temperature gradients.

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“…An overall measure of jet mixing is given in figure 19, where the mass-averaged non-dimensional total temperature parameter of Kenzakowski et al 12 is plotted versus X/D. The parameter is computed as follows:…”

Section: A Flow Effectsmentioning

confidence: 99%

Computational Analysis of the Flow and Acoustic Effects of Jet-Pylon Interaction

Hunter

Thomas

Pao

et al. 2005

11th AIAA/CEAS Aeroacoustics Conference

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Computational simulation and prediction tools were used to understand the jet-pylon interaction effect in a set of bypass-ratio five core/fan nozzles. Results suggest that the pylon acts as a large scale mixing vane that perturbs the jet flow and jump starts the jet mixing process. The enhanced mixing and associated secondary flows from the pylon result in a net increase of noise in the first 10 diameters of the jet's development, but there is a sustained reduction in noise from that point downstream. This is likely the reason the pylon nozzle is quieter overall than the baseline round nozzle in this case. The present work suggests that focused pylon design could lead to advanced pylon shapes and nozzle configurations that take advantage of propulsion-airframe integration to provide additional noise reduction capabilities. Nomenclature

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Study of three-stream laboratory jets with passive mixing enhancements for noise reduction

Cited by 24 publications

References 2 publications

Numerical Simulation of Single-Stream Jets from a Serrated Nozzle

Numerical Simulation of Single-Stream Jets from a Serrated Nozzle

Computational and Experimental Flowfield Analyses of Separate Flow Chevron Nozzles and Pylon Interaction

Computational Analysis of the Flow and Acoustic Effects of Jet-Pylon Interaction

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