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Simulated High Speed Flight Effects On Supersonic Jet Noise
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Book Synopsis Simulated High Speed Flight Effects on Supersonic Jet Noise by : Thomas D. Norum
Download or read book Simulated High Speed Flight Effects on Supersonic Jet Noise written by Thomas D. Norum and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shock Structure and Noise of Supersonic Jets in Simulated Flight to Mach 0.4 by : Thomas D. Norum
Download or read book Shock Structure and Noise of Supersonic Jets in Simulated Flight to Mach 0.4 written by Thomas D. Norum and published by . This book was released on 1988 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shock Structure and Noise of Supersonic Jets in Simulated Flight to Mach 0.4 by : Thomas D. Norum
Download or read book Shock Structure and Noise of Supersonic Jets in Simulated Flight to Mach 0.4 written by Thomas D. Norum and published by . This book was released on 1988 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Generation and Radiation of Supersonic Jet Noise: Append. 2. Shock associated noise data by :
Download or read book The Generation and Radiation of Supersonic Jet Noise: Append. 2. Shock associated noise data written by and published by . This book was released on 1972 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simulation of Supersonic Jet Noise Reduction Using Fluid Inserts for Low Bypass Ratio Turbofans by : Chitrarth Prasad
Download or read book Simulation of Supersonic Jet Noise Reduction Using Fluid Inserts for Low Bypass Ratio Turbofans written by Chitrarth Prasad and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis The Generation and Radiation of Supersonic Jet Noise: Future studies for definition of supersonic jet noise generation and reduction mechanisms by :
Download or read book The Generation and Radiation of Supersonic Jet Noise: Future studies for definition of supersonic jet noise generation and reduction mechanisms written by and published by . This book was released on 1972 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Generation and Radiation of Supersonic Jet Noise: Summary of supersonic jet noise studies by :
Download or read book The Generation and Radiation of Supersonic Jet Noise: Summary of supersonic jet noise studies written by and published by . This book was released on 1972 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aeroacoustics of Supersonic Jet Interacting with Solid Surfaces and Its Suppression by : Seyyed Saman Salehian
Download or read book Aeroacoustics of Supersonic Jet Interacting with Solid Surfaces and Its Suppression written by Seyyed Saman Salehian and published by . This book was released on 2020 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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.
Book Synopsis The Generation and Radiation of Supersonic Jet Noise: Theory of turbulence generated jet noise, noise radiation from upstream sources, and combustion noise by :
Download or read book 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 published by . This book was released on 1972 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Generation and Radiation of Supersonic Jet Noise: Progress toward a unified theory of jet engine noise by : Lockheed-Georgia Company
Download or read book The Generation and Radiation of Supersonic Jet Noise: Progress toward a unified theory of jet engine noise written by Lockheed-Georgia Company and published by . This book was released on 1972 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supersonic Transport Airport and Community Jet Noise During Takeoff and Initial Climb by : John B. Whitlow
Download or read book Supersonic Transport Airport and Community Jet Noise During Takeoff and Initial Climb written by John B. Whitlow and published by . This book was released on 1967 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Supersonic Jet Noise Reductions Predicted with Increased Jet Spreading Rate by :
Download or read book Supersonic Jet Noise Reductions Predicted with Increased Jet Spreading Rate written by and published by . This book was released on 1995 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some Effects of Flight Path and Atmospheric Variations on the Boom Propagated from a Supersonic Aircraft by : Raymond L. Barger
Download or read book Some Effects of Flight Path and Atmospheric Variations on the Boom Propagated from a Supersonic Aircraft written by Raymond L. Barger and published by . This book was released on 1964 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Equations for the shock wave envelope and cusp line associated with the boom propagated from a supersonic aircraft are formulated in terms of the moving-trihedral coordinate system for flight in a uniform atmosphere and also in an atmosphere with a linear sound-speed gradient. Ray-tube theory is used to calculate the lateral distribution of boom intensity in an atmosphere with a linear sound-speed gradient and also to investigate the effect of a general wind and sound-speed gradient on the ground-track intensity. The relative effects of wind and temperature gradient are treated. The mechanism of focusing by winds and by ground structures are discussed qualitatively.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722862459 Total Pages :40 pages Book Rating :4.8/5 (624 download)
Book Synopsis The Effects of Profiles on Supersonic Jet Noise by : National Aeronautics and Space Administration (NASA)
Download or read book The Effects of Profiles on Supersonic Jet Noise written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-13 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of velocity profiles on supersonic jet noise are studied by using stability calculations made for a shock-free coannular jet, with both the inner and outer flows supersonic. The Mach wave emission process is modeled as the noise generated by the large scale turbulent structures or the instability waves in the mixing region. Both the vortex-sheet and the realistic finite thickness shear layer models are considered. The stability calculations were performed for both inverted and normal velocity profiles. Comparisons are made with the results for an equivalent single jet, based on equal thrust, mass flow rate and exit area to that of the coannular jet. The advantages and disadvantages of these velocity profiles as far as noise radiation is concerned are discussed. It is shown that the Rayleigh's model prediction of the merits and demerits of different velocity profiles are in good agreement with the experimental data. Tiwari, S. N. and Bhat, T. R. S. Unspecified Center NAG1-1581...
Author :United States. Department of Transportation. Library Services Division Publisher : ISBN 13 : Total Pages :52 pages Book Rating :4.:/5 (319 download)
Book Synopsis Aircraft Noise and Sonic Boom by : United States. Department of Transportation. Library Services Division
Download or read book Aircraft Noise and Sonic Boom written by United States. Department of Transportation. Library Services Division and published by . This book was released on 1969 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721010196 Total Pages :90 pages Book Rating :4.0/5 (11 download)
Book Synopsis Supersonic Jet Exhaust Noise at High Subsonic Flight Speed by : National Aeronautics and Space Administration (NASA)
Download or read book Supersonic Jet Exhaust Noise at High Subsonic Flight Speed written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-11 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: An empirical model to predict the effects of flight on the noise from a supersonic transport is developed. This model is based on an analysis of the exhaust jet noise from high subsonic flights of the F-15 ACTIVE Aircraft. Acoustic comparisons previously attainable only in a wind tunnel were accomplished through the control of both flight operations and exhaust nozzle exit diameter. Independent parametric variations of both flight and exhaust jet Mach numbers at given supersonic nozzle pressure ratios enabled excellent correlations to be made for both jet broadband shock noise and jet mixing noise at flight speeds up to Mach 0.8. Shock noise correlated with flight speed and emission angle through a Doppler factor exponent of about 2.6. Mixing noise at all downstream angles was found to correlate well with a jet relative velocity exponent of about 7.3, with deviations from this behavior only at supersonic eddy convection speeds and at very high flight Mach numbers. The acoustic database from the flight test is also provided.Norum, Thomas D. and Garber, Donald P. and Golub, Robert A. and Santa Maria, Odilyn L. and Orme, John S.Armstrong Flight Research Center; Langley Research CenterJET AIRCRAFT NOISE; JET EXHAUST; SUBSONIC SPEED; SUPERSONIC SPEED; MATHEMATICAL MODELS; AEROACOUSTICS; FLIGHT TESTS; SHOCK WAVES; SUPERSONIC TRANSPORTS; MACH NUMBER; JET MIXING FLOW; F-15 AIRCRAFT; PRESSURE RATIO; EXHAUST NOZZLES; VORTICES; DATA REDUCTION; DATA ACQUISITION
Book Synopsis Numerical Simulation of the Effect of Heating on Supersonic Jet Noise by : R. Hixon
Download or read book Numerical Simulation of the Effect of Heating on Supersonic Jet Noise written by R. Hixon and published by . This book was released on 1997 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: