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Friday, July 10, 2020 | History

1 edition of Investigation of coannular nozzles with conventional and inverted velocity profiles found in the catalog.

Investigation of coannular nozzles with conventional and inverted velocity profiles

Investigation of coannular nozzles with conventional and inverted velocity profiles

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Published by The Service, National Technical Information Service [distributor in Washington, D.C, Springfield, Va .
Written in English

    Subjects:
  • Jet planes -- Noise.,
  • Jet nozzles -- Evaluation.,
  • Aerodynamic noise.

  • Edition Notes

    StatementB.H. Goethert ... [et al.] ; prepared for U.S. Department of Transportation, Federal Aviation Administration, Systems Research & Development Service.
    ContributionsGoethert, B. H., United States. Federal Aviation Administration. Systems Research and Development Service., University of Tennessee (System). Space Institute.
    The Physical Object
    Paginationxii, 127 p. :
    Number of Pages127
    ID Numbers
    Open LibraryOL17825370M

    capability and dual stream exhaust which utilize coannular inverted velocity profiles leading to noise reduction. While the variable cycle engine concepts appear promising, comparable technology low bypass ratio turbofan engines with mechanical suppressors remain under study as . 4. Velocity in a Nozzle: For unit mass, The steady flow equation is, q – w = Δ h + Δ PE + Δ KE. For a horizontal nozzle, Δ PE = 0. There is no work-done in nozzle therefore W = 0. In the nozzle, the velocity of the fluid is so high that there is hardly any time available for fluid to exchange heat with the surroundings.

      In what follows results of an investigation of the changes in far field directivity caused by changes in the inverted velocity profile and by simulated flight are described. This information is used to estimate that acoustic efficiency of various inverted profile jets and to determine the reduction in total acoustic power caused by forward flight. The current approach to coannular jet noise prediction used in FOOTPR is reported in Refere which updates the earlier conventional-velocity-profile (CVP, Ref. 17) and inverted-velocity-profile (IVP, Ref. 18) models.

    designed a new Tri-nozzle to increase the velocity of fluids flowing through it. It is designed based on basic convergent-Divergent nozzle to have same throat area, length, convergent angle and divergent angle as single nozzle. But the design of Tri-nozzle is optimized to have high expansion co-efficient than. screw, the outside of the nozzle profile is made straight and the trailing edge of the nozzle is thicker. Detailed information about these nozzle sections can be found in Oosterveld (). (a) (b) Fig.3 (a) Nozzle 19A, (b) Nozzle Rice-Speed and HR nozzles. Conventional duct sections (e.g. Nozzle 19A).


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Investigation of coannular nozzles with conventional and inverted velocity profiles Download PDF EPUB FB2

The results of the investigation of the noise characteristics of the exhaust jets from coannular nozzles with conventional and inverted velocity profiles are. Investigation of coannular nozzles with conventional and inverted velocity profiles (Book, ) [] Get this from a library.

Investigation of coannular nozzles with conventional and inverted velocity profiles. [B H Goethert; United States. The noise characteristics of the exhaust jets from coannular nozzles with conventional and inverted velocity profiles were investigated.

Experiments were made on a series of coannular nozzles of equal primary and secondary by: 1. Aerodynamic and acoustic investigation of inverted velocity profile coannular exhaust nozzle models and development of aerodynamic and acoustic prediction procedures. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.

the noise characteristics of inverted-velocity-profile coannular nozzles. The jet noise prediction method for coannular jets published by the SAE in (ref. 6) was used to establish a noise-level reference for the inverted- velocity-profile nozzles. This method, herein referred to. testing of coannular plug nozzles with inverted velocity profile, and to the preliminary study of its application to advanced variable cycle engines (VCE) appropriate for supersonic cruise aircraft.

COANNULAR PLUG NOZZLE NOISE INVESTIGATIONS AT GENERAL ELECTRIC. The results of the investigation of the noise characteristics of the exhaust jets from coannular nozzles with conventional and inverted velocity profiles are presented.

Experiments were carried out on a series of coannular nozzles of equal primary and secondary area. coannular nozzle velocity however, decays at a very rapid rate, since the fan stream is being acted upon by both the outer ambient air and the primary flow in the core.

The region of the plume from the coannular nozzle which is generating the peak noise is therefore at a low velocity. The results of the investigation of the noise characteristics of the exhaust jets from coannular nozzles with conventional and inverted velocity profiles are presented.

Experiments were carried out. nozzle and blade profiles International Journal of Mechanical and Production Engineering, ISSN:Volume- 1, Issue- 5, Nov Computational Investigation Of Flow Within C-D Rectangular Supersonic Nozzle And Impulse Turbine. Journal of Sound and Vibration () 98(1), SHOCK ASSOCIATED NOISE OF INVERTED-PROFILE COANNULAR JETS, PART I: EXPERIMENTS H.

TANNA, W. BROWN AND C. TAMt Lockheed-Georgia Company, Marietta, GeorgiaU.S.A. (Received 25 Septemberand in revised form 16 March ) The reduction of shock-associated noise in inverted-velocity-profile coannular.

Journal of Sound and Vibration () 78(4), THE NOISE CHARACTERISTICS OF INVERTED PROFILE COANNULAR JETSt A. CARGILL Rolls-Royce Limited, P. Derby, England AND J. DUPONCHEL S.N.E.C.M.A., Paris, France VELOCITY (Received 10 Februaryand in revised form 6 April ) Measurements have been made of the noise of inverted velocity profile coannular.

Normal-Velocity - Profile Coannular Jets both conventional round and chevron nozzles were manufactured and tested to explore the potential possibility of. The noise reductions from both normal- and inverted-velocity-profile (IVP) shock-free coannular jets are critically assessed on the basis of existing data.

The fully mixed equivalent (FMEQ) single jet, defined as having a uniform exit profile and the same thrust, mass flow rate and exit area as the coannular jet, is used throughout as the reference for noise.

and shock waves. An investigation {described in an unpublished note} has been made of design criteria for annular nozzles and the results are presented in Section 2.

It is assumed that, for given values of the design parameters, the velocity. The results of the investigation of the noise characteristics of the exhaust jets from coannular nozzles with conventional and inverted velocity profiles are presented.

An Investigation of the Inuence of Nozzle Aspect Ratio on the Velocity Field of Turbulent Plane Jet R. Deo, J. Mi and G. Nathan Turbulence, Energy and Combustion [TEC] Group, School of Mechanical Engineering, Adelaide University, South Australia Abstract The effect of nozzle aspect ratio (w H) (major axis to minor.

The current approach to coannular jet noise prediction used in FOOTPR is reported in Refere which updates the earlier conventional-velocity-profile (CVP, Ref.

17) and inverted-velocity. A Jet Exhaust Noise Prediction Procedure for Inverted Velocity Profile Coannular Nozzles AIAA-paper, 79–, Google Scholar /8/.

Larson, R.S. Effects of Geometric and Flow - Field Variables on Inverted Velocity Profile Coaxial Jet Noise and Source Distributions AIAA-paperGoogle Scholar. On the side of the jet where the cooler stream is introduced, the near-nozzle peak velocity is reduced to 83% of the heated jet exit velocity, which is associated with a reduction in the measured peak turbulent stress levels in the region between three to six jet diameters from the nozzle exit.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA AIAA PaperMarch Larson, R. S.; Nelson, D. P.; Stevens, B. S.: Aerodynamic and Acoustic Investigation of Inverted Velocity Profile Coannular Exhaust Nozzle Models and Development of Aerodynamic and Acoustic Prediction Procedures.

Pratt and Whitney Aircraft, PWA, May of the maximum velocity at the exit of the nozzle. Fig.9 Velocity Profile of conical micronozzle at mass flow rate of [mg/s] Mass Flow Rate (mg/s) Fig Velocity Profile of conical micronozzle at mass flow rate of 2[mg/s] Fig Temperature Profile of conical micronozzle at mass flow rate of [mg/s] 0 1 2 0.