Noise Control of a High Reynolds Number High Speed Heated Jet Using Plasma Actuators

Kearney-Fischer, Martin; Kim, Jin-Hwa; Samimy, Mo

doi:10.1260/1475-472x.10.5-6.635

Cited by 41 publications

(32 citation statements)

References 58 publications

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“…Over the past several years, detailed experiments have been carried out to investigate the effects of LAFPAs on both the flowfield and farfield acoustics of unheated and heated Mach 0.9, 1.3, and 1.65 jets [6,55,[57][58][59][60][61][62]. For the Mach 1.65 jet, two nozzles are used: a standard contoured nozzle designed using the method of characteristics, and a conical nozzle (both conical converging and diverging sections, with a sharp throat) typical of the variable area nozzles used in tactical aircraft.…”

Section: Resultsmentioning

confidence: 99%

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High-Speed and High-Reynolds-Number Jet Control Using Localized Arc Filament Plasma Actuators

Samimy

Kearney-Fischer

Kim

et al. 2012

Journal of Propulsion and Power

105

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A class of plasma actuators called localized arc filament plasma actuators for high-speed and high-Reynoldsnumber flow and acoustic control has been developed at the Gas Dynamics and Turbulence Laboratory. Over the past several years, these high-bandwidth (0 to 200 kHz) and individually controlled actuators have been used successfully to excite the jet shear layer, jet column, and azimuthal instabilities in high subsonic and supersonic jets. The focus of this paper is to provide detailed information and sample results highlighting the capabilities and potential of the actuators and the control technique for mixing enhancement, noise mitigation, and flow and acoustic diagnostics. The jet, using three different nozzles, is operated over a large range of jet Mach numbers (0.9 to 1.65), stagnation temperature ratios (up to 2.5), and Reynolds numbers (0:2 10 6 to 1:65 10 6 ). Over this space of operating conditions, the jet is found to respond to control with a large range of forcing Strouhal numbers and azimuthal modes. The results reveal that the jet flowfield and acoustic far field can be dramatically altered, providing a powerful control tool in these practical high-speed and high-Reynolds-number jets.

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Section: Resultsmentioning

confidence: 99%

“…3-5. Spatial correlation of PIV images were used to determine structure spacing in all the jets listed in Table 1 for various St DF and m. Either the radial component of velocity [59] or Q criterion [61] were used to determine the structure spacing . The results shown in Fig.…”

Section: B Effects Of Control On the Flow Structuresmentioning

confidence: 99%

High-Speed and High-Reynolds-Number Jet Control Using Localized Arc Filament Plasma Actuators

Samimy

Kearney-Fischer

Kim

et al. 2012

Journal of Propulsion and Power

105

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“…Kearney-Fischer et al (2011) employed pulsed plasma actuators to force subsonic and supersonic jets at frequencies up to approximately St = 3. By phasing eight actuators around the periphery of the nozzle, they excited (approximations of ) azimuthal modes up to m = 3.…”

Section: Control Of Jet Noisementioning

confidence: 99%

Wave Packets and Turbulent Jet Noise

Jordan

Colonius

2013

Annu. Rev. Fluid Mech.

526

299

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Turbulent jet noise is a controversial fluid mechanical puzzle that has amused and bewildered researchers for more than half a century. Whereas numerical simulations are now capable of simultaneously predicting turbulence and its radiated sound, the theoretical framework that would guide noise-control efforts is incomplete. Wave packets are intermittent, advecting disturbances that are correlated over distances far exceeding the integral scales of turbulence. Their signatures are readily distinguished in vortical turbulence; the irrotational, evanescent near field; and the propagating far field. We review evidence of the existence, energetics, dynamics, and acoustic efficiency of wave packets. We highlight how extensive data available from simulations and modern measurement techniques can be used to distill acoustically relevant turbulent motions. The evidence supports theories that seek to represent wave packets as instability waves, or more general modal solutions of the governing equations, and confirms the acoustic importance of these structures in the aft-angle radiation of high subsonic and supersonic jets. The resulting unified view of wave packets provides insights that can help guide control strategies.

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“…These actuators have been extensively tested both experimentally (Refs. [23][24][25][26][27] and numerically (Refs. 21,22,[28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Twinjet Configuration with and without Flow Control

Goparaju

Gaitonde

Bhaumik

2015

22nd AIAA Computational Fluid Dynamics Conference

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Jet noise has been an active area of research owing to public health concerns and aviation regulations. This problem is further amplified with the use of multiple engines placed in closed proximity to each other. In addition to significantly altered farfield noise as compared to a single-jet, previous experimental results show high levels of dynamic pressure fluctuations in the inter-nozzle region which can cause structural damage. In this work, Large Eddy Simulations are performed to study the dynamics of a supersonic twinjet configuration, with and without flow control. Results indicate that relative to single-jet configuration, twinjets show decrease in column lengths due to significant modifications in shear-layer properties. The simulations also corroborate previous experimental observations of very high levels of dynamic pressure fluctuations in the inter-nozzle region relative to a single-jet configuration for identical flow parameters. The phenomenon of noise shielding along the plane containing the two jets has been reported for all the twinjet cases explored in this work and trends of sound pressure levels obtained at various polar angles indicate an increased efficiency of shielding at lower polar angles. The sensitivity of the dynamic pressure fluctuations on the nozzle-exit boundary layer thickness is also characterized. Simulations are also performed to mimic the effects of Localized Arc Filament Plasma Actuators at different excitation frequencies (St=0.3 and 0.9) actuated in an axisymmetric fashion (m=0). Close to the nozzle exit, toroidal structures formed as a result of control result in significant increase in jet spreading leading to the formation of a recirculation region along the symmetry plane, relative to the uncontrolled case. This excitation scheme increased the levels of dynamic pressure fluctuations closer to the nozzle exit in the inter-nozzle region. In contrast, the near field shows significant reduction in pressure fluctuations, especially for the higher Strouhal number case.

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Noise Control of a High Reynolds Number High Speed Heated Jet Using Plasma Actuators

Cited by 41 publications

References 58 publications

High-Speed and High-Reynolds-Number Jet Control Using Localized Arc Filament Plasma Actuators

High-Speed and High-Reynolds-Number Jet Control Using Localized Arc Filament Plasma Actuators

Wave Packets and Turbulent Jet Noise

Investigation of a Twinjet Configuration with and without Flow Control

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