A Fluid Acoustic Coupled Simulation Of Supersonic Jet Noise
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A Fluid Acoustic Coupled Simulation Of Supersonic Jet Noise
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Author : K. Viswanathan
language : en
Publisher:
Release Date : 1994
A Fluid Acoustic Coupled Simulation Of Supersonic Jet Noise written by K. Viswanathan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Simulation Of Supersonic Jet Noise With The Adaptation Of Overflow Cfd Code And Kirchhoff Surface Integral
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-06-19
Simulation Of Supersonic Jet Noise With The Adaptation Of Overflow Cfd Code And Kirchhoff Surface Integral written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-06-19 with categories.
An acoustic prediction capability for supersonic axisymmetric jets was developed on the basis of OVERFLOW Navier-Stokes CFD (Computational Fluid Dynamics) code of NASA Langley Research Center. Reynolds-averaged turbulent stresses in the flow field are modeled with the aid of Spalart-Allmaras one-equation turbulence model. Appropriate acoustic and outflow boundary conditions were implemented to compute time-dependent acoustic pressure in the nonlinear source-field. Based on the specification of acoustic pressure, its temporal and normal derivatives on the Kirchhoff surface, the near-field and the far-field sound pressure levels are computed via Kirchhoff surface integral, with the Kirchhoff surface chosen to enclose the nonlinear sound source region described by the CFD code. The methods are validated by a comparison of the predictions of sound pressure levels with the available data for an axisymmetric turbulent supersonic (Mach 2) perfectly expanded jet. Kandula, Max and Caimi, Raoul and Steinrock, T. (Technical Monitor) Kennedy Space Center NASA/TM-2001-210263, NAS 1.15:210263
Simulation Of Supersonic Jet Noise With The Adaptation Of Overflow Cfd Code And Kirchhoff Surface Integral
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Author :
language : en
Publisher:
Release Date : 2001
Simulation Of Supersonic Jet Noise With The Adaptation Of Overflow Cfd Code And Kirchhoff Surface Integral written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Simulation Of Supersonic Jet Noise Reduction Using Fluid Inserts For Low Bypass Ratio Turbofans
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Author : Chitrarth Prasad
language : en
Publisher:
Release Date : 2019
Simulation Of Supersonic Jet Noise Reduction Using Fluid Inserts For Low Bypass Ratio Turbofans written by Chitrarth Prasad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
The design constraints on jet engines for high performance supersonic military aircraft require lower bypass ratios and supersonic exhaust velocities, which result in very high noise levels. This is a great concern to the US Navy as the noise generated from the jet exhaust of high performance supersonic military aircraft can affect the hearing and performance of personnel working in close proximity of the aircraft. There have been reports about the US Department of Veteran Affairs spending over hundreds of millions of dollars in disability payments for hearing loss compensation to former Navy personnel. In addition to this, jet noise is also a source of annoyance in communities in the vicinity of airbases and military training routes.Over the years, several noise reduction methods have been proposed with varying levels of success. The most effective noise reduction strategies include the installation of chevrons, and the use of corrugated seals, among many others. One primary disadvantage of these technologies is that they are passive technologies and cannot be switched off or modified after take-off and hence may reduce overall aircraft performance. An active, though steady, noise reduction technology is the use of fluid inserts in the divergent section of a converging-diverging nozzle. The fluid inserts consist of rows of injectors that inject a small amount of bypass air into the diverging section of the nozzle. It has been shown that by altering the configuration and operating conditions of the fluid inserts, noise reduction for both mixing and shock noise can be achieved. Since this blowing can be controlled, the fluid inserts can be switched off or modified after take-off to minimize any performance penalty to the aircraft.Although considerable experimental research has been performed to explore the effects of fluid inserts on the jet exhaust, the available data have been found to be insufficient to correlate the noise reduction with changes in the flow-field due to the noise reduction device. The present study is an extension to the previousresearch on fluid inserts that uses Large Eddy Simulation (LES) with the Ffowcs Williams-Hawkings (FWH) analogy for farfield noise prediction. The simulations are carried out using a commercially available CFD package, STAR-CCM+. The project aims to simulate and analyze the unsteady flow changes associated withthe noise reduction device to help understand the detailed mechanisms for the observed noise reductions.Different fluid insert configurations are used to analyze the effect of individual injector placement in a fluid insert on noise generation. It is observed that the changes in upstream noise correlate extremely well with the shock structure of the fluid insert jets downstream of the nozzle exit. Further insight into the noisereduction patterns is obtained by using two-point space time correlations and the use of the modal techniques such as Proper Orthogonal Decomposition on the near-field data on the FWH surface, which show that fluid inserts reduce the amplitude of the noise radiating coherent structures. Using Doaks Momentum Potential Theory, it is observed that the changes associated with fluid insertson the hydrodynamic and acoustic modes correlate well with the far-field noise reduction.
The Generation And Radiation Of Supersonic Jet Noise
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Author : Lockheed-Georgia Company
language : en
Publisher:
Release Date : 1972
The Generation And Radiation Of Supersonic Jet Noise written by Lockheed-Georgia Company and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Jet planes categories.
The Generation And Radiation Of Supersonic Jet Noise Progress Toward A Unified Theory Of Jet Engine Noise
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Author : Lockheed-Georgia Company
language : en
Publisher:
Release Date : 1972
The Generation And Radiation Of Supersonic Jet Noise Progress Toward A Unified Theory Of Jet Engine Noise written by Lockheed-Georgia Company and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Jet planes categories.
Numerical Simulation Of The Effect Of Heating On Supersonic Jet Noise
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Author : R. Hixon
language : en
Publisher:
Release Date : 1997
Numerical Simulation Of The Effect Of Heating On Supersonic Jet Noise written by R. Hixon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Computational aeroacoustics categories.
The Generation And Radiation Of Supersonic Jet Noise Theory Of Turbulence Generated Jet Noise Noise Radiation From Upstream Sources And Combustion Noise
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Author :
language : en
Publisher:
Release Date : 1972
The Generation And Radiation Of Supersonic Jet Noise Theory Of Turbulence Generated Jet Noise Noise Radiation From Upstream Sources And Combustion Noise written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Jet planes categories.
The Generation And Radiation Of Supersonic Jet Noise Future Studies For Definition Of Supersonic Jet Noise Generation And Reduction Mechanisms
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Author :
language : en
Publisher:
Release Date : 1972
The Generation And Radiation Of Supersonic Jet Noise Future Studies For Definition Of Supersonic Jet Noise Generation And Reduction Mechanisms written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Jet planes categories.
Aeroacoustics Of Supersonic Jet Interacting With Solid Surfaces And Its Suppression
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Author : Seyyed Saman Salehian
language : en
Publisher:
Release Date : 2020
Aeroacoustics Of Supersonic Jet Interacting With Solid Surfaces And Its Suppression written by Seyyed Saman Salehian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Aerodynamics categories.
"The noise generated by supersonic jet is of primary interest in the high-speed flight. In several flight conditions jet exhaust of the propulsion system interacts with solid surfaces. For example, jet impingement on ground for a rocket lift-off, or interactions influenced by the integration of the engine with the airframe. Such complex applications require consideration of the role of acoustic-surface interactions on the noise generation of the jet and its radiation. Numerical analysis of supersonic jet noise involved in these scenarios is investigated by employing Hybrid Large Eddy Simulation - Unsteady Reynolds Averaged Simulation approach to model turbulence. First, the supersonic impinging jet noise reduction using aqueous injectors is investigated. The technique employed to suppress impingement noise, involves injecting liquid water from the ground surface. The Volume of Fluid model is adopted to simulate the two phase flow. The flow field and acoustic results agree well with the existing experimental data. The possible mechanisms of noise reduction by water injection are investigated. Second, supersonic jet noise reduction by employing the shielding effect of a flat plate parallel to the jet is investigated. The numerical simulations model the shielding effect of the flat plate on the acoustics of supersonic jet, and results agree with the corresponding experimental data. The physical mechanisms involved in the flow-surface interactions are investigated. With understanding these mechanisms, a slightly wavy plate is proposed including theoretical background to determine the parameters needed for the way wall to provide acoustic reduction efficiently. Results show that the proposed wavy shield can effectively reduce both the level and extent of the jet noise source as compared to that of a flat shield."--Abstract.
