Last edited by Mazuktilar
Friday, August 7, 2020 | History

3 edition of Noise from supersonic coaxial jets. found in the catalog.

Noise from supersonic coaxial jets.

M. D. Dahl

Noise from supersonic coaxial jets.

by M. D. Dahl

  • 343 Want to read
  • 23 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Noise generators.,
  • Supersonic jet flow.,
  • Noise intensity.,
  • Velocity distribution.,
  • Shear layers.,
  • Stability.

  • Edition Notes

    Other titlesInverted velocity profile.
    StatementM.D. Dahl and P.J. Morris.
    Series[NASA contractor report] -- 207388., NASA contractor report -- NASA CR-207388.
    ContributionsMorris, P. J., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15541254M

    On the Characterization of Noise Sources in Supersonic Shock Containing Jets A Dissertation in Aerospace Engineering by Jérémy Veltin Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy December Cited by: 9. Noise Sources in Heated Coaxial Jets In many investigations on cold jets a noise mechanism is proposed to have similarity spectra for the two components of turbulent mixing. That is, the sound spectrum is dominated of both subsonic and supersonic jets. Viswanathan [3], however, argues that the acoustic change at high jet.

      Development of a supersonic business aircraft would 'leverage' the extensive know-how and technologies developed for military airplanes but hinges on the effective reduction of take-off noise generated by the supersonic jets exhausting from the engines of such aircrafts (Debiasi, Papamoschou ). A supersonic aircraft is an aircraft able to fly faster than the speed of sound (Mach number 1). Supersonic aircraft were developed in the second half of the twentieth century and have been used almost entirely for research and military purposes. Only two, Tupolev Tu (first flight - Decem ) and the Concorde (first flight - March 2, ), ever entered service for .

    Journal of Sound and Vibration () 81(3), SHOCK ASSOCIATED NOISE OF SUPERSONIC JETS FROM CONVERGENT-DIVERGENT NOZZLES C. K. W. TAM 1 AND H. K. TANNA Lockheed-Georgia Company, Marietta, Georgia , U.S.A. (Received 29 September , and in revised form 30 July ) Results of experimental and theoretical studies of the Cited by: Reinventing Concorde Supersonic jets may be about to make a comeback. jets travelling at supersonic speeds are currently on the market. And fears .


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Noise from supersonic coaxial jets by M. D. Dahl Download PDF EPUB FB2

Instability waves have been established as the dominant source of mixing noise radiating into the downstream arc of a supersonic jet when the waves have phase velocities that are supersonic relative to ambient conditions.

Recent theories for supersonic jet noise have used the concepts of growing and decaying linear instability waves for predicting radiated by: 6. SUPERSONIC COAXIAL JET NOISE PREDICTIONS Milo D. DaM* NASA Lewis Research Center Cleveland,OH Philip J.

Morris t Penn State University University Park, PA ABSTRACT Predictions are made for the noise radiation from su-personic, coaxial jets. These predictions are based on the assumption that the noise radiation in the down. of supersonic coaxial jets. The results from mean flow and stability calculations are used to predict the noise radiation from coaxial jets with different operating conditions.

Comparisons are made between different coaxial jets and to a single equivalent jet File Size: 6MB. Get this from a library.

Noise from supersonic coaxial jets. Part 3, Inverted velocity profile. [M D Dahl; P J Morris; United States. National Aeronautics and Space Administration.].

Noise from Imperfectly Expanded Supersonic Coaxial Jets Article (PDF Available) in AIAA Journal 39(3) March with 54 Reads How we measure 'reads'. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current Noise from supersonic coaxial jets.

book, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.

the noise from perfectly expanded, supersonic, coaxial jets. This is followed by a description of the characteristics of the measured noisespectraand noiselevels inthe far” behavior of the noise levels with changing operating conditions is shown to be consistent with what is expected for normal-velocity-pro” le jets.

Anderson, B. A., Wygnanski, I. J., & Gutmark, E. Noise reduction by interaction of flexible filaments with an underexpanded supersonic 37th Aerospace Sciences Meeting and Exhibit [AIAA ] American Institute of Aeronautics and Astronautics Inc, by: 8. Noise and Noise Reduction in Supersonic Jets Philip J.

Morris and Dennis K. McLaughlin The Pennsylvania State University Department of Aerospace Engineering Presented at FLINOVIA State College, PA April 2 Noise and Noise Reduction in Supersonic JetsFile Size: 2MB.

This instability wave noise generation model has been applied to supersonic jets with a single shear layer and is now applied to supersonic coaxial jets with two initial shear layers.

In this paper the case of coaxial jets with normal velocity profiles is considered, where the inner jet stream velocity is higher than the outer jet stream by: In the far-field, four acoustic components typical of non-ideally expanded supersonic jets are observed, namely the screech noise, the broadband shock-associated noise, the.

A SYSTEMATIC STUDY OF SUPERSONIC JET NOISE cylindrical surface of radius 36" coaxial to jet (high temperature jet) 19 Axial distribution of intensity at discrete frequencies 58 20 High temperature (*R) perfectly expanded rectangular 59 In subsonic jets, the noise is reduced to a considerable extent with.

The present understanding of jet noise generation mechanisms and noise predictions is then presented. It is shown that there remain two competing explanations of many observed phenomena. The ability of the different approaches to predict jet noise is assessed. Both subsonic and supersonic jets are considered.

three perfectly expanded supersonic jets at Mach numberand and at room temperature were measured. It was found that the noise source strength distributions of these jets radiating to the maximum noise direction (, andrespectively, from the exhaust. In this paper, predictions are made of noise radiation from single, supersonic, axisymmetric jets.

We examine the effects of changes in operating conditions and the effects of simulated enhanced mixing that would increase the spreading rate of the jet shear layer on radiated noise by: 2. A new facility to study supersonic coaxial jets has been designed and built for the investigation of shock-cell noise on single and dual stream jets.

An innovative coaxial silencer has been realized to eliminate spurious noise from the piping and valve by: 1. This paper summarizes a two-part session, “Supersonic Jet and Rocket Noise,” which consisted of 24 talks that addressed a diverse set of topics related to launch vehicle and jet aircraft noise problems.

Liftoff noise can create a damaging vibrational response in the vehicle and its payloads, whereas radiated jet noise.

This paper describes a novel noise reduction method for supersonic jets. It involves the injection of relatively small amounts of air into the diverging section of a convergent-divergent nozzle. The air is injected through a series of injectors that are aligned : Philip J.

Morris, Dennis K. McLaughlin. Regarding LTO Noise, CAEP recommended that an exploratory study using currently available data be undertaken during the CAEP/12 cycle (). The results of the study are intended to provide a better understanding of airport noise impacts resulting from the introduction of supersonic aircraft.

History’s first independently-developed supersonic jet. XB-1 will demonstrate key technologies for safe, efficient and sustainable supersonic travel. The new era of travel.

Boom is building the world’s fastest civil aircraft, Overture. Flights twice as fast mean we can go twice as far—bringing more people, places, and cultures into our lives. Shock-cell noise occurs in aero-engines when the nozzle exhaust is supersonic and shock-cells are present in the jet.

In commercial turbofan engines, at cruise, the secondary flow is often supersonic underexpanded, with the formation of annular shock-cells in the jet and consequent onset of shock-cell noise.

This paper aims at describing the design process of the new facility Cited by: 1.A supersonic jet faster than the Concorde will get public design debut in Centennial Boom Technology unveils full size mock up of test plane that will ultimately seat The Concorde, a now-retired supersonic passenger jet, flew at speeds of up to about 1, mph (2, km/h).

Boom also aims to set a new speed record .