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Saturday, July 25, 2020 | History

3 edition of Supersonic coaxial jets found in the catalog.

Supersonic coaxial jets

Supersonic coaxial jets

noise predictions and measurements

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Published by National Aeronautics and Space Administration, Lewis Research Center, National Technical Information Service, distributor in [Cleveland, Ohio], [Springfield, Va .
Written in English

    Subjects:
  • Supersonic jet flow.,
  • Noise prediction.,
  • Noise spectra.,
  • Sound waves.,
  • Turbulent flow.,
  • Coaxial flow.

  • Edition Notes

    StatementMilo D. Dahl, Dimitri Papamoschou, Ray Hixon.
    SeriesNASA/TM -- 1998-207422., NASA technical memorandum -- 207422.
    ContributionsPapamoschou, Dimitri., Hixon, Ray., Lewis Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15507840M

    Boom Supersonic General Information Description. Manufacturer of a supersonic aircraft intended to travel distances faster than the required time. The company's aircraft are made up of advanced aerodynamics and engines and is designed to accommodate next-generation sustainable alternative fuels, enabling travelers to save the time and cost of long-distance travel. A supersonic dual coaxial jet has been employed popularly for various industrial purposes, such as gasdynamic laser, supersonic ejector, noise control and enhancement of mixing.

    HRL simulation of a supersonic coaxial He/Air jet exp. at various Le t 5 optimized meshes have been chosen to include all the mixing region delimited by boundaries of 1% and 99% center jet molar fraction described in the experiment. An example of overlapping meshes on . The big 3 components of supersonic aircraft. What technologies combine to make Overture faster and more efficient than today’s airliners? Read more. Tomorrow's air travel is supersonic and sustainable. Innovation holds the key to building a supersonic and sustainable future.

    Keywords: coaxial jet, supersonic, shock-cells, aeroacoustics. 1. Introduction An efficient design of a new experimental facility in fluid dynamics requires always an iterative procedure and several steps must be followed, if we want to obtain the maximum number of benefits, at the minimum cost. One of. “Effect of ratio of wall boundary-layer thickness to jet diameter on mixing of a normal hydrogen jet in a supersonic stream,” NASA TM X McClinton, C. R. (). “Hypersonic technology Past, present and future,” inaugural presentation at the Institute for .


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Supersonic coaxial jets Download PDF EPUB FB2

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, 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 coronavirus.

The mixing enhancement of a coaxial jet with a Mach primary jet and sonic secondary jet, at different convective Mach numbers, is presented in this study.

Rectangular tabs of Author: Arun Kumar Perumal, Himanshu Singh, Ethirajan Rathakrishnan. 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.

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 with.

Abstract. The present study addresses an experimental investigations of the near field flow structures of supersonic, dual, coaxial, swirl jet. The swirl stream is discharged from the secondary annular nozzle and the primary inner nozzle provides the sonic and supersonic free by: 1.

A supersonic coaxial jet facility has been designed to provide experimental data suitable for the validation of CFD codes used to analyze high-speed propulsion flows. The center jet is of a light gas and the coflow jet is of air, and the mixing layer between them is compressible.

Design of a Facility for Studying Shock-Cell Noise on Single and Coaxial Jets 1 March | Aerospace, Vol. 5, No. 1 Generation of Mach waves by supersonic jets. Recent theories for supersonic jet noise have used an instability wave noise generation model to predict radiated noise.

This model requires a known mean flow that has typically been described by simple analytic functions for single jet mean flows. The mean flow of supersonic coaxial jets is not described easily in terms of analytic functions. STUDY OF SUPERSONIC, DUAL, COAXIAL, SWIRLING JET September Department of Energy and Materials Science Graduate School of Science and Engineering Saga University Japan Kwon-Hee Lee.

STUDY OF SUPERSONIC, DUAL, COAXIAL, SWIRLING JET Kwon-Hee Lee A dissertation submitted for the degree of. Abstract Rectangular supersonic free and coaxial jets were used to enhance mixing relative to a circular jet in a convective Mach number range of to The different convective Mach numbers were obtained by changing the central jet gas composition, the temperatures of the inner and outer flows, and the velocity of the coaxial flow.

The mean flow of supersonic coaxial jets is not described easily in terms of analytic functions. To provide these profiles at all axial locations, a numerical scheme is developed to calculate the. personic, coaxial jets. These predictions are based on the assumption that the noise radiation in the down-stream direction of supersonic jets is dominated by sound generated by instability waves with supersonic phase velocities relative to ambient.

Since the analy-sis requires a known mean flow and the coaxial jet mean. Get this from a library. The aeroacoustics of supersonic coaxial jets. [Milo D Dahl; United States. National Aeronautics and Space Administration.]. 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 velocity. Towards numerical simulations of supersonic liquid jets using ghost fluid method International Journal of Heat and Fluid Flow, Vol.

53 Aeroacoustics of Three-Stream High-Speed Jets from Coaxial and Asymmetric Nozzles. The present study addresses an experimental investigations of the near field flow structures of supersonic, dual, coaxial, swirl jet.

The swirl stream is discharged from the secondary annular nozzle and the primary inner nozzle provides the sonic and supersonic free jets. The interactions between the secondary swirl and inner sonic/supersonic jets are quantified by a fine Pitot impact and.

Coaxial jets have applications in supersonic ejectors, noise control techniques and enhancement of mixing. Coaxial jet nozzles regulate spreading rates by developing virtuous mean flow and shortening primary flow potential core length. In the present paper, two-dimensional coaxial jet profiles of different area ratios are designed and analyzed.

While supersonic aircraft might satisfy a portion of this long-range market, it is ex-pected that the market will be dominated by subsonic aircraft—at least in this cen-tury.

Substantial improvements in technol-ogy for subsonic aircraft may provide the incentive for new designs. To offset rising. Buy A Supersonic Argon/Air Coaxial Jet Experiment for Computational Fluid Dynamics Code Validation on FREE SHIPPING on qualified orders A Supersonic Argon/Air Coaxial Jet Experiment for Computational Fluid Dynamics Code Validation: Nasa Technical Reports Server (Ntrs): : Books.

27th ICDERS July 28th–August 2nd, Beijing, China Combustion enhancement in supersonic coaxial jet with an optimal forcing oscillations C.C. Liu1, B. Yu1, B. Zhang1, H. Liu1 1School of Aeronautics and Astronautics, Shanghai Jiao Tong University Shanghai, China 1 Introduction The low combustion efficiency owing to the poor mixing performance is the main challenge in scramjet.

Boom is getting ready to roll out its first supersonic jet, the XB The aircraft is a one-third-scale demonstrator of Boom's planned flagship, the Overture, which could be the first commercial. This book chronicles the rise and abrupt end of supersonic flight via the Concorde jets.

Lawrence Azerrad has done a nice job turning his passion for Concorde and his personal collection of related design, ephemera and imagery into a light design history of the jets. The book design is precise, well-considered and beautifully s: The present study addresses an experimental investigation of the near field flow structures of supersonic, dual, coaxial, free, jet, which is discharged from the coaxial annular nozzle.

The secondary stream is made from the annular nozzle of a design Mach number of and the primary inner stream from a convergent-divergent nozzle.

The objective of the present study is to investigate the.