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Wednesday, July 29, 2020 | History

3 edition of Interaction of sound from supersonic jets with nearby structures found in the catalog.

Interaction of sound from supersonic jets with nearby structures

Interaction of sound from supersonic jets with nearby structures

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Published by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, VA, [Springfield, Va .
Written in English

    Subjects:
  • Supersonic jet flow.,
  • Aeroacoustics.,
  • Aircraft structures.,
  • Interactions.,
  • Computational fluid dynamics.,
  • Pressure distribution.,
  • Velocity distribution.

  • Edition Notes

    StatementC.C. Fenno, Jr., A. Bayliss, L. Maestrello.
    SeriesICASE report -- no. 97-31., NASA contractor report -- 201708., NASA contractor report -- NASA CR-201708.
    ContributionsBayliss, Alvin., Maestrello, L., Institute for Computer Applications in Science and Engineering.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15505132M

    The swept wing immediately went to the top of design priorities for high-speed flight. In the U.S., North American redesigned the XP as a sweptwing airplane; Boeing did the same with a new design that emerged as the XB; and Douglas, at Navy request, split the D program into two phases: the straight-wing turbojet-powered D Skystreak and the sweptwing jet-and-rocket-powered D   T. A. Manning and S. K. Lele, “ Numerical simulation of shock-vortex interactions in supersonic jet screech,” AIAA Paper No. (). Google Scholar; 9. X. D. Li and J. H. Gao, “ Numerical simulation of the generation mechanism of axisymmetric supersonic jet screech tones,” Phys. Flu ().

    Supersonic aircraft fly under varying conditions of Mach, altitude, and g's pulled in a turn. Some of these characteristics, along with different aircraft types are examined in this section. Aircraft Type The principal supersonic aircraft examined here is the F/A E/F. The T .   We present results of high energy density laboratory experiments on the production of supersonic radiatively cooled plasma jets with dimensionless parameters (Mach number ~30, cooling parameter ~1 and density contrast ρ j /ρ a ~ 10) similar to those in young stellar objects jets. The jets are produced using two modifications of wire array Z-pinch driven by 1 MA, ns current pulse of.

    ture in a supersonic jet. They have obtained reasonable agreement between their near-field predictions and the experimental results of Yu and Dosanjh (ref. 7) for an unheated high Reynolds number, Mach jet. This theory, which is described more fully by Tam and Morris in reference 8, assumes that no interaction occurs between. imation methods. This particular choice is motivated by industrial applications like aircraft engines and gas transport systems. This course is inspired by the book of Dowling and Ffowcs Williams: “Sound and Sources of Sound” [52]. We also used the lecture notes of the course on aero- .


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Interaction of sound from supersonic jets with nearby structures Download PDF EPUB FB2

Get this from a library. Interaction of sound from supersonic jets with nearby structures. [C C Fenno; Alvin Bayliss; L Maestrello; Institute for Computer Applications in Science and Engineering.].

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): A model of sound generated in an ideally expanded supersonic (Mach 2) jet is solved numerically. Two con gurations are considered; (i) a free jet and (ii) an installed jet with a nearby array of exible aircraft type panels.

In the later case the panels vibrate in response to loading by sound from the jet and the full. INTERACTION OF SOUND FROM SUPERSONIC JETS WITH NEARBY STRUCTURES C.

Fenno, Jr. 1 National Research Council, Hampton, VA A. Bayliss 2 Northwestern University, Evanston, IL L. Maestrello NASA Langley Research Center, Hampton, VA Abstract A model of sound generated in an ideally expanded supersonic (Mach 2) jet is solved.

INTERACTION OF SOUND FROM SUPERSONIC JETS WITH NEARBY STRUCTURES. By C. Fenno, a free jet and (ii) an installed jet with a nearby array of exible aircraft type panels. In the later case the panels vibrate in response to loading by sound from the jet and the full coupling between the panels and the jet is considered, accounting for panel Author: C.

Fenno, A. Bayliss and L. Maestrello. adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86ACited by: 9. supersonic jet screech: half-century from powell to the present Journal of Sound and Vibration, Vol. No. 3 Theory and modelling of the interaction of two parallel supersonic plasma jets.

Kumar R, Wiley A, Venkatakrishnan L, Alvi F () Role of coherent structures in supersonic impinging jets. Phys Fluids 25(7) Google Scholar Mason-Smith N, Edgington-Mitchell D, Buchmann N, Honnery D, Soria J () Shock structures and instabilities formed in an underexpanded jet impinging on to cylindrical sections.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA The interactions between gas and water are turbulent, and the plume exhibits unstable bubbly interfaces.

This work employed both experimental and numerical methods to obtain the flow structures of over-expanded gaseous jets driven by different pressure ratios in water. Broadband shock-associated noise is an important component of the overall noise generated by modern airplanes. In this study, sound generated by the weakly nonlinear interaction between linear instability waves and the shock-cell structure in supersonic jets is investigated numerically in order to gain insight into the broadband shock-noise problem.

In the present paper, we give a brief overview of the studies of supersonic jet flows which were performed recently with the aim of gaining experimental data on the formation of the shock-wave structure and jet mixing layer in such flows. Considerable attention is paid to a detailed description of discharge conditions for supersonic jets, to enable the use of measured data for making a.

Supersonic gaseous jets with large ambient pressure are typically found in deep-water propulsion systems. The interactions between gas and water are t. The density field of underexpanded supersonic free jets issuing from a choked circular nozzle was measured using a Rayleigh scattering-based technique.

This reliable and nonintrusive technique is particularly suitable for high-speed flows and is fundamentally superior to the intrusive probes and particle-based techniques such as laser Doppler velocimetry. Rectangular supersonic jets exist widely in propulsion systems of aircrafts.

When they are imperfectly expanded under certain conditions, the upstream traveling waves referred to as screech tones w. An experimental investigation into the sound-producing characteristics of moderately and highly underexpanded supersonic impinging jets exhausting from a round convergent nozzle is presented.

The production of large plate tones by impingement on a square plate with a side dimension equal to 12 nozzle exit diameters is studied using random and phase-locked shadowgraph photography. () Interaction of Sound from Supersonic Jets with Nearby Structures. AIAA Journal() Interaction of a slender vortex with a rigid sphere: Dynamics and far-field sound.

These proceedings primarily focus on advances in the theory, experiments, and numerical simulations of turbulence in the contexts of flow-induced vibration and noise, as well as their control.

Fluid-r. Modeling studies of laser machining rarely incorporate gas effects in part because of the complex structure and turbulent nature of jet flow. In this paper, the interaction of a supersonic, turbulent axisymmetric jet with the workpiece is studied.

Numerical simulations are carried out using an explicit, coupled solution algorithm with solution. Supersonic impinging jet(s) inherently produce a highly unsteady flow field. The occurrence of such flows leads to many adverse effects for short take-off and vertical landing (STOVL) aircraft such as: a significant increase in the noise level, very high unsteady loads on nearby structures and an appreciable loss in lift during hover.

Almost every air traveler wishes they could get their flight over with faster and get to their destination. To that end, fifteen years after the commercial failure of the Concorde, airlines are again investigating the potential for supersonic Concorde’s top speed, slightly more than twice the speed of sound, is much faster than typical passenger aircraft, so the time savings are.

Imperfectly expanded supersonic jets have an additional source of noise called screech noise. According to Powell, the screech tones are caused due to a resonant feedback loop caused within the ow [22, 21].

The interaction of the shock cell structure of the jet and the shear layer causes certain acoustic disturbances to develop.The term sound barrier is still sometimes used today to refer to aircraft reaching supersonic flight. Breaking this sound barrier produces a Sonic Boom. In dry air at 20 °C (68 °F), the speed of sound is metres per second (about mph, km/h or 1, ft/s).The sound wave is heard as the familiar "thud" or "thump" of a sonic boom, commonly created by the supersonic flight of aircraft.

The shock wave is one of several different ways in which a gas in a supersonic flow can be compressed. Some other methods are isentropic compressions, including Prandtl–Meyer compressions. The method of compression.