Further Development of Supersonic Jet Noise Reduction Using Nozzle Fluidic Inserts

Morgan, Jessica; McLaughlin, Dennis K.; Morris, Philip J.; Prasad, Chitrarth

doi:10.2514/6.2017-0683

Cited by 18 publications

(9 citation statements)

References 11 publications

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“…1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 θ 160 150 140 135 130 120 110 100 90 80 70 65 60 55 all three nozzle variants. This is consistent with previous experimental observations [14]. The φ = 60 • azimuthal location corresponds to the plane bisecting the two-fluid inserts for the 3FC-1FI and 3FC-2FI jets (as shown in figure 2b).…”

Section: Large Eddy Simulation Formulationsupporting

confidence: 92%

“…All the jets simulated in this work operate at an ambient temperature of 288.15 K and a reference pressure of 101 008 Pa. These ambient values and the boundary conditions are in accordance with previously published RANS data for fluid insert nozzles (for example, [14].) All external fluid boundaries, except the downstream face, are set as non-reflecting freestream boundaries based on characteristic variables.…”

Section: Large Eddy Simulation Formulationsupporting

confidence: 56%

“…It is a variable area ratio nozzle capable of adjusting its throat to exit area ratio based on the flight regime. This ratio is chosen as 1.295 to match previous experiments [11][12][13][14]. This is typical of takeoff conditions and corresponds to a design Mach number (M d ) of 1.65.…”

Section: Description Of Nozzle Variantsmentioning

confidence: 99%

“…Although considerable research has been performed to explore the effects of fluid inserts on the jet exhaust, both in the form of experiments [11][12][13][14] and computations [15][16][17], the available data have been found to be insufficient to correlate the noise benefit with changes in the flow-field due to the noise reduction device. The present study is an extension of previous research on fluid inserts that uses large eddy simulation (LES) with the Ffowcs Williams-Hawkings (FWH) analogy for far-field noise prediction.…”

Section: Introductionmentioning

confidence: 99%

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Effect of fluid injection on turbulence and noise reduction of a supersonic jet

Prasad

Morris

2019

Phil. Trans. R. Soc. A.

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Supersonic jets, such as the ones used in high-performance military aircraft, have both downstream and upstream noise components due to the large-scale turbulent structures and the presence of shock cells in the jet plume. The fluid insert technology is a noise reduction method that has been shown to effectively reduce both these noise components. This paper analyses the unsteady flow changes associated with different fluid insert configurations with a goal of helping to understand the detailed noise reduction mechanisms. Using direct cross-correlations of the near-field data with the far-field microphone signals, it is found that even the use of a single injector as a fluid insert helps break up the large-scale structures of the flow. However, a more azimuthally distributed blowing is required to reduce the upstream broadband shock-associated noise (BBSAN). Addition of upstream injectors at each azimuthal location further enhances the BBSAN reduction. Decomposition of the jet flow-field into hydrodynamic and acoustic modes shows that fluid insert nozzles reduce the amplitude and convection speed of the coherent acoustic mode in the plane of highest noise reduction. This article is part of the theme issue ‘Frontiers of aeroacoustics research: theory, computation and experiment’.

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Section: Large Eddy Simulation Formulationsupporting

confidence: 92%

Section: Large Eddy Simulation Formulationsupporting

confidence: 56%

Section: Description Of Nozzle Variantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of fluid injection on turbulence and noise reduction of a supersonic jet

Prasad

Morris

2019

Phil. Trans. R. Soc. A.

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“…The research group at the Pennsylvania State University led by P. Morris and D. McLaughlin developed a noise reduction design using injectors placed inside the nozzle. They performed several experimental 8,47–51 and numerical analyses 52–55 on different injector configurations, nozzle pressure ratios (NPRs), and total temperature ratios (TTRs). The unheated case was chosen since experimental flow-field measurements are available for comparison from Powers et al., 50 in order to understand if our numerical simulations were reproducing properly the physics of the jet.…”

Section: Introductionmentioning

confidence: 99%

Noise reduction analysis of supersonic unheated jets with fluidic injection using large eddy simulations

Coderoni

Lyrintzis

Blaisdell

2018

International Journal of Aeroacoustics

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A set of large eddy simulations is used to perform a numerical analysis of fluidic injection as a tool for noise reduction. This technique, developed at the Pennsylvania State University, allows one to turn on and off the air injectors in order to reduce the noise during takeoff and landing without penalizing performance in other flight regimes. Numerical simulations are performed on a military-style nozzle based on the GE F400-series engines, with a design Mach number of 1.65, for overexpanded jet conditions. The numerical results are compared and validated with the outcome of experiments performed at the Pennsylvania State University. For the case chosen, the fluidic injection shows the potential of breaking down shock cells into smaller structures with different orientation and strength. This directly reduces the intensity of broadband shock associated noise, with a positive effect of reducing the overall sound pressure level by more than 1:5 dB along the direction of maximum sound propagation of the baseline case. The maximum noise reduction was found to be almost 3 dB at 55 on the azimuthal plane in between two lines of injectors.

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Noise and Noise Reduction in Supersonic Jets

Morris

McLaughlin

2018

Flinovia—Flow Induced Noise and Vibration Issues and Aspects-Ii

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Further Development of Supersonic Jet Noise Reduction Using Nozzle Fluidic Inserts

Cited by 18 publications

References 11 publications

Effect of fluid injection on turbulence and noise reduction of a supersonic jet

Effect of fluid injection on turbulence and noise reduction of a supersonic jet

Noise reduction analysis of supersonic unheated jets with fluidic injection using large eddy simulations

Noise and Noise Reduction in Supersonic Jets

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