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3 edition of Mixing of multiple jets with a confined subsonic crossflow found in the catalog.

Mixing of multiple jets with a confined subsonic crossflow

J. D. Holdeman

Mixing of multiple jets with a confined subsonic crossflow

  • 302 Want to read
  • 28 Currently reading

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

    Subjects:
  • Jet mixing flow.,
  • Three dimensional flow.,
  • Orifices.,
  • Mass flow.,
  • Gas turbine engines.,
  • Ducted flow.,
  • Combustion chambers.,
  • Cross flow.

  • Edition Notes

    Other titlesPart II, Opposed rows of orifices in rectangular ducts.
    StatementJames D. Holdeman, David S. Liscinsky, Daniel B. Bain.
    SeriesNASA technical memorandum -- 107461.
    ContributionsLiscinsky, David S., Bain, Daniel B., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15484286M

    ence between the crossflow and the liquid jet, not just the crossflow velocity. As a result, in cases where the jet has a significant velocity, the velocity associated with the Weber number should be the vector combina-tion of the jet and crossflow velocities, which could be . Transverse jets in crossflow are widely used to enhance mixing between two flow streams. Such jets exhibit complex flow features, and are highly sen- sitive to a wide variety of operating conditions. The focus of this work is the mixing of relatively low Reynolds number jets that are often encountered in the chemical processing industry. Supersonic and subsonic aircraft fly in atmospheric regions that have quite different dynamical and chemical regimes. Subsonic aircraft fly in the upper troposphere and in the stratosphere near the tropopause, where stratospheric residence times due to exchange with the troposphere are measured in months. Proposed supersonic aircraft will fly in.   The Interaction of Jets with Crossflow The Interaction of Jets with Crossflow Mahesh, Krishnan It is common for jets of ï¬ uid to interact with crossï¬ ow. This article reviews our understanding of the physical behavior of this important class of ï¬ ow in the incompressible and compressible : Mahesh, Krishnan.

    What turbine engine section provides for proper mixing of the fuel and air? combustion section. In a gas turbine engine, combustion occurs at a constant. Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. The pressure of subsonic air as if flows through a.


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Mixing of multiple jets with a confined subsonic crossflow by J. D. Holdeman Download PDF EPUB FB2

Mixing of opposed rows of jets with a confined subsonic crossflow in rectangular ducts. The studies from which these results were excerpted investigated flow and geometric variations typical of the complex 3-D flowfield in the combustion chambers in gas turbine engines.

The principal observation was that the momentum-flux ratio, J, and the. Get this from a library. Mixing of multiple jets with a confined subsonic crossflow: summary of NASA-supported experiments and modeling. [J D Holdeman; Lewis Research Center.].

Prog. Energy Corabust. Sci. Vol. 19, pp. 31 70 /93 $ Printed in Great Britain. Pergamon Press Ltd MIXING OF MULTIPLE JETS WITH A CONFINED SUBSONIC CROSSFLOW JAMES D. HOLDEMAN* National Aeronautics and Space Administration, Lewis Research Center, Cleveland, 0H, U.S.A. Received 21 December Abstract--This Cited by: This paper summarizes experimental and computational results on the mixing of opposed rows of jets with a confined subsonic crossflow in rectangular ducts.

The studies from which these results were excerpted investigated flow and geometric variations typical of the complex 3-D flowfield in the Mixing of multiple jets with a confined subsonic crossflow book chambers in gas turbine engines.

Mixing of Multiple Jets With a Confined Subsonic Crossflow: Part I—Cylindrical Duct J. Eng. Gas Turbines Power (October, ) The Effects of Air Preheat and Number of Orifices on Flow and Emissions in an RQL Mixing SectionCited by: California, Irvine.

The studies investigated the mixing of jets injected normal to a confined subsonic mainsteam in both rectangular and cylindrical ducts. Experimental and computational studies were performed in both nonreacting and reacting flows.

The orifice geometries and flow conditions were selected as typical of the complex three-dimensional. Get this from a library. Mixing of multiple jets with a confined subsonic crossflow Part II, opposed rows of orifices in rectangular ducts. [J D Holdeman; D S Liscinsky; Daniel B Bain; United States.

National Aeronautics and Space Administration.]. This paper summarizes NASA-supported experimental and computational results on the mixing of a row of jets with a confined subsonic crossflow in a cylindrical duct. The studies from which these results were excerpted investigated flow and geometric variations typical of the complex three-dimensional flowfield in the combustion chambers in gas Cited by:   The mixing of the round jet normal to a uniform crossflow is studied for a range of jet-to-crossflow velocity ratios, r, from 5 to Planar laser-induced fluorescence (PLIF) of acetone vapour seeded into the jet is used to acquire quantitative two-dimensional images of the scalar concentration by: English, Book, Government publication, Microform edition: Mixing of multiple jets with a confined subsonic crossflow [microform]: summary of NASA-supported experiments and modeling / James D.

Holdeman ; prepared for the 27th Joint Propulsion Conference cosponsored by AIAA, SAE, ASME, and ASEE, Sacramento, California, June The mixing of multiple air jets with a subsonic heated crossflow in a constant area duct was studied experimentally.

The jet-to-mainstream momentum flux ratio was varied from 6 to Abstract. The jet in crossflow or transverse jet has been studied extensively because of its relevance to a wide variety of flows in technological systems, including fuel or dilution air injection in gas turbine engines, thrust vector control for high speed airbreathing and rocket vehicles, and exhaust plumes from power by: 3.

AbstractIn our previous work, a new technology has been proposed that the cooled synthetic gas (syngas) produced in the partial oxidation process can be used as Mixing of multiple jets with a confined subsonic crossflow book medium.

The mixing of the hot product gas and cold syngas is critical to this new quenching approach. In this work, both experimental measurements and CFD simulations were Cited by: 6. An experimental investigation of isothermal jet-mixing in a swirling crossflow has been conducted using a planar Mie-scattering technique.

The mixing. A jet in crossflow (JICF) is a fundamental canonical flow for the investigation of turbulent mixing and combustion. It is of relative simplicity yet retaining many features of interest, such as three-dimensionality, separation and recirculation regions, wall-bounded effects, and vortical flows.

Jets in Crossflow Figure: Isometric view of a jet in crossflow. Contours of velocity (v) on the symmetry plane indicate the extent of the jet. Jet cross--section, at various distances along the jet length is shown using contours of us. Streamlines at. An analysis of experimental data is presented for three methods, developed by Murdock, James, and Benjamin and Miller, used to design flashing orifices needed for the development and exploitation of a liquid dominant geothermal field.

The three methods were tested by comparing the computed values of. Abstract. The scalar concentration field of the round jet in a uniform crossflow is studied for a range of jet to crossflow velocity ratios, r, with emphasis on r = 10 using planar laser-induced fluorescence (PLIF) of acetone. For a top-hat jet exit velocity profile, the emerging presence of jet fluid in the wake structures is seen for for r > Cited by: 1.

Mixing of a Plain Jet into a Swirling Crossflow B.J. Masuda and V.G. McDonell* UCI Combustion Laboratory University of California Irvine CA USA G.W. Oskam Solar Turbines Incorporated PO Box San Diego, CA USA Abstract Many gas turbine combustion systems employ swirl to help mix fuel and air and subsequently stabilizeFile Size: KB.

on multiple jets in cross flow in a subsonic wind tunnel. He produced data for jet trajectories of tandem jets injected normal and inclined to a cross stream as well as data for side-by-side jets injected normal to a cross stream.

Ziegler and Wooler. The same is found true for laminar confined co-axial jets as can be seen by comparing the mixture fraction fields shown in Fig.

10, Fig. Thus generally the laminar mixing problem also increases in proportion to Reynolds number until a transition to unsteady or turbulent flow is achieved.

Download: Download full-size image; Fig. Cited by: Results of experimental research on aerodynamic and acoustic control of subsonic turbulent jets by acoustic excitation are presented.

It was demonstrated that these control methods, originated by authors, not only can intensify mixing (by acoustic irradiation at low frequency), but also notably ease it (at high-frequency irradiation). Investigation of Sonic Jet Mixing in a Stream of Supersonic Cross-flow Using Large Eddy Simulations using Laser Doppler Velocimeter (LDV).

As the measurements were taken in several planes, and the accuracy of the measurement technique is considered very good (i.e., LDV method), it pro-vides an excellent opportunity for CFD code by: 6. A uniformly valid solution is then constructed for use in a stability analysis that concentrates on the effect of crossflow upon the dominant mode of the free jet.

Both the characteristic frequency and growth rate of this mode are found to increase with λ, in qualitative agreement with recent experimental by:   Mixing of multiple jets with a confined subsonic crossflow in a cylindrical Duct.

The international gas turbine and aeroengine congress & exhibition Birmingham, UK -JuneASME. GT Google ScholarAuthor: Yinli Xiao, Zhibo Cao, Changwu Wang.

Predictions are in good agreement with experiments of clustered jet groups, turbulent plume pairs, alternating diffusers, and rosette buoyant jet groups; the approach can also be extended to multiple jets in cross-flow. The mixing of a rosette buoyant jet group in a cross-flow is reviewed. Molecular mixing via jets in conJined volumes scale global vortices (Konrad ).

For example, a factor of lo3 variation in Schmidt number only changes the amount of turbulent mixing in a plane shear layer by at most a factor of two. Physical reasons for this behaviour have been proposed as follows.

The timescale of the largest eddies is. The interaction of multiple tandem jets in a cross-flow has been studied through experiments.

Experiments are conducted with 2–8 momentum and buoyant jets discharged into a perpendicular cross-flow. The tracer concentration field is measured by the laser-induced fluorescence technique.

BREAKUP CHARACTERISTICS OF A LIQUID JET IN SUBSONIC CROSSFLOW A Thesis Presented to in the School of Aerospace Engineering Georgia Institute of Technology August BREAKUP CHARACTERISTICS OF LIQUID JET IN SUBSONIC CROSSFLOW Approved by: Dr. Ben T. Zinn, Advisor School of Aerospace Engineering Primary Breakup of.

Rayleigh/Mie scattering (from flow-field ice crystals) was used to study mixing and penetration of a forced supersonic jet in a supersonic Mach (M)-2 cross stream. Instantaneous images—using image planes along (side-view) and normal (end-view) to the flow axis—were used to study the dynamical structures in the jet whereas ensemble images provide information Cited by: Manipulation and Control of Jets in Crossflow (CISM International Centre for Mechanical Sciences) [Karagozian, Ann R., Cortelezzi, Luca, Soldati, Alfredo] on *FREE* shipping on qualifying offers.

Manipulation and Control of Jets in Crossflow (CISM International Centre for Mechanical Sciences)Format: Paperback. An expansion in terms of the ratio of the characteristic crossflow velocity U to jet velocity Uj, a flow structure associated with enhanced mixing by the transverse jet in comparison with that by the free jet.

Mixing of multiple jets in a confined Cited by:   However, for jets undergoing strong screeching, there is broadband noise amplification for both turbulent mixing noise components.

It is discovered through a pilot study of the noise spectrum of rectangular and elliptic supersonic jets that the turbulent mixing noise of these jets is also made up of the same two noise components found in.

noise for subsonic and supersonic jets. Moreover, the effect of chevron for the subsonic jet noise and the effect of temperature on flow and noise in near field of supersonic jet was studied.

2 Numerical method The method is based on Navier-Stokes equations describing the flow of a compressible gas. on mixing. Unmixedness was found to be highest for.

J = 4 since the penetrations and thus. collision of opposing jets were weak for. J = 4. When. J = 9, 16, 64, mixing was improved by jet collision. It is proposed that the mixing mechanisms are differed depending on. INTRODUCTION. eddy simulatio. The operating temperatures of combustors. Flow and Acoustic Characteristics of Subsonic and Supersonic Jets from Convergent Nozzle.

NASA Contractor Report CR [Nagamatsu, H. (et al).] on *FREE* shipping on qualifying offers. Flow and Acoustic Characteristics of Subsonic and Supersonic Jets from Convergent Nozzle.

NASA Contractor Report CRAuthor: H. (et al). Nagamatsu. Mixing Field Characteristics of Multi-lateral Jets Injected into a Round Pipe Flow C.X.

Thong1, P.A.M. Kalt1, B.B. Dally1, C.H. Birzer1 1School of Mechanical Engineering The University of Adelaide, South AustraliaAustralia Abstract Jet in cross-flow is a well-studied and characterised fluid-mixing Size: KB. determine the near and far field mixing of coaxial jets. Chigier and Beer () studied the near nozzle flow region in double concentric jets.

Ko and Kwan () and Kwan and Ko () carried out subsonic coaxial jet studies and divided the near field into different zones, while defining the mixing regions with demonstration of. A review of individual state mixing zone policies shows that 48 out of 50 states make use of a mixing zone in some form (Table ).

The mixing zone dimensions vary from state to state as shown in Table The mixing zone can be defined as a downstream distance, cross-sectional area, or volume of water. Subsonic air entering the engine inlet is slowed down to low subsonic speed by the diffuser compressed to a high pressure and enters into the combustion chamber where heat is added to it by burning the fuel then t he high pressure, h igh temperature air is expanded out through the turbine into the nozzle where it is accelerated to high speed to.

@article{osti_, title = {Physics and technology of low-temperature plasma}, author = {Dresvin, S V and Donskoi, A V and God'dfarb, V M and Klubnikin, V S}, abstractNote = {Plasmatrons and their technical possibilities are considered together with the composition of a plasma, its thermodynamic functions, and the spectral diagnostics of a low-temperature plasma.LES predictions of mixing enhancement for Jets In Cross-Flows C Pri ere y, LYM Gicquely x, P Kaufmannz, W Krebsz and T Poinsot] y European Center For Research and Formation in Advanced Computations, 42 Avenue Coriolis, Toulouse Ce France z Siemens PG, M uhlheim an der Ruhr, Germany.Velocity characteristics of multiple impinging jets through a crossflow: Authors: characteristics of the flowfield due to an impingement of two and three jets against a wall through low-velocity crossflow.

The results obtained characterize the turbulent transport that is typical of the multiple impinging flows that are associated with a.