Large-Eddy Simulations Analysis of Supersonic Heated Jets with Fluid Injection for Noise Reduction

Coderoni, Marco; Lyrintzis, Anastasios S.; Blaisdell, Gregory A.

doi:10.2514/1.j057674

Cited by 19 publications

(7 citation statements)

References 65 publications

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“…In this study, numerical simulations were performed using both LES and RANS methods, and the results showed good agreement between the two methods and were also consistent with previous experimental data. The computational results showed that the effectiveness of the heated jet mainly changes the spreading Subsequently, Coderoni conducted further research comparing the effects of heated and cold jets on engine noise [137]. In this study, numerical simulations were performed using both LES and RANS methods, and the results showed good agreement between the two methods and were also consistent with previous experimental data.…”

Section: Jet Noise Controlsupporting

confidence: 75%

“…Subsequently, Coderoni conducted further research comparing the effects of heated and cold jets on engine noise [137]. In this study, numerical simulations were performed using both LES and RANS methods, and the results showed good agreement between the two methods and were also consistent with previous experimental data.…”

Section: Jet Noise Controlsupporting

confidence: 68%

“…Additionally, in this study, Coderoni used the Q-criterion to identify larger turbulent structures in the flow field (Figure 30) and found that the introduction of the jet reduced the presence of these large turbulent structures in the exhaust gas, thereby reducing the intensity of mid-tolow-frequency noise. the larger structures that are more distant from the jet axis [137].…”

Section: Jet Noise Controlmentioning

confidence: 99%

See 2 more Smart Citations

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Zhu,

Guo,

Sun

et al. 2023

Fluids

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As humans continue to explore the aerospace field, higher demands have been placed on new types of propulsion systems. Meanwhile, active secondary flow has been applied to various aspects of engines over the past seventy years, significantly enhancing engine performance. For the new generation of propulsion systems, active secondary flow remains a highly promising technology. This article provides an overview of the application of active secondary flow in engines, including a review of the past research on the secondary jet flow field, and an introduction of the more prominent applications of the jet in engines and its research progress. Finally, the problems existing in the current application of the secondary jet are summarized, and the future direction of the research is anticipated.

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Section: Jet Noise Controlsupporting

confidence: 75%

Section: Jet Noise Controlsupporting

confidence: 68%

Section: Jet Noise Controlmentioning

confidence: 99%

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Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Zhu,

Guo,

Sun

et al. 2023

Fluids

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show abstract

“…Versatility of active control techniques makes them an attractive choice for military aircraft that operate in a wide range of temperature and expansion ratios. Micro-jets (Alvi et al 2008) or fluidic inserts (Coderoni, Lyrintzis & Blaisdell 2019;Prasad & Morris 2020) have been extensively studied in this regard, due to their ability to enhance mixing in the shear layer through the introduction of streamwise vortices. These techniques have been effective in reducing noise levels along certain planes of a nozzle and in suppressing tonal noise components.…”

Section: Introductionmentioning

confidence: 99%

Effect of plasma actuator-based control on flow-field and acoustics of supersonic rectangular jets

Prasad

Unnikrishnan

2023

J. Fluid Mech.

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We perform a computational study on the effects of localized arc filament plasma actuator based control on the flow field and acoustics of a supersonic 2:1 aspect ratio rectangular jet. Post validation of the baseline jet, effects of control in the context of noise reduction are studied at experimentally guided forcing parameters, including frequencies $St=0.3, 1.0$ and $St=2.0$ with duty cycles of $20\,\%$ and $50\,\%$ . In general, high-frequency forcing reduces noise in the downstream direction, with the actuator signature appearing mostly in the sideline direction. Here $St=1$ , ${\rm DC}=50\,\%$ yields an optimum balance between peak noise reduction (of ${\sim }1.5$ dB) and actuator tones, with control being most effective on the major axis plane that bisects the shorter edges of the nozzle. Shear layer response to the most effective forcing includes generation of successive arrays of mutually interacting staggered lambda vortices, which eventually energize streamwise vortical elements. Causal mechanisms of noise mitigation are further elucidated as follows. First, the control reduces the energy within the supersonic phase speed regime of peak radiating frequencies by redistributing a part of it into a high-frequency band. Second, it enhances azimuthal percolation of energy into the first and second helical modes at frequencies where noise reduction is seen, thus weakening the radiatively efficient axisymmetric mode. Finally, sound-producing intermittent events in the jet are significantly reduced, thereby minimizing the high-intensity acoustic emissions. This small-perturbation-based control strategy results in only minor variations in the mean flow properties. However, reduced production and enhanced convection attenuate turbulent kinetic energy within the spreading shear layer in the controlled jet.

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“…Many of the techniques developed for comprehensive CAA have made their way into acoustic analogy approaches that use CFD: correct local dispersion, propagation, and non-reflecting boundary conditions are still seen in acoustic analogy predictions. 166,167 However, there are many limitations to performing full domain comprehensive CAA that have slowed its adoption in the rotorcraft community. For eVTOL aircraft, the primary areas of interest for noise prediction are typically in the acoustic far field.…”

Section: Computational Aeroacousticsmentioning

confidence: 99%

Challenges and opportunities for low noise electric aircraft

Greenwood

Brentner

Rau

et al. 2022

International Journal of Aeroacoustics

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A new class of electric aircraft is being developed to transport people and goods as a part of the urban and regional transportation infrastructure. To gain public acceptance of these operations, these aircraft need to be much quieter than conventional airplanes and helicopters. This article seeks to review and summarize the aeroacoustic research relevant to this new category of aircraft. First, a brief review of the history of electric aircraft is provided, with an emphasis on how these aircraft differ from conventional aircraft. Next, the physics of rotor noise generation are reviewed, and the noise sources most likely to be of concern for electric aircraft are highlighted. These are divided into deterministic and nondeterministic sources of noise. Deterministic noise is expected to be dominated by the unsteady loading noise caused by the aerodynamic interactions between components. Nondeterministic noise will be generated by the interaction of the rotor or propeller blades with turbulence from ingested wakes, the atmosphere, and self-generated in the boundary layer. The literature for these noise sources is reviewed with a focus on applicability to electric aircraft. Challenges faced by the aeroacoustician in understanding the noise generation of electric aircraft are then identified, as well as the new opportunities for the prediction and reduction of electric aircraft noise that may be enabled by advances in computational aeroacoustics, flight simulation, and autonomy.

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Large-Eddy Simulations Analysis of Supersonic Heated Jets with Fluid Injection for Noise Reduction

Cited by 19 publications

References 65 publications

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Research Progress on Active Secondary Jet Technology in Supersonic Flow Field of Aerospace Propulsion Systems

Effect of plasma actuator-based control on flow-field and acoustics of supersonic rectangular jets

Challenges and opportunities for low noise electric aircraft

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