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Sunday, July 19, 2020 | History

1 edition of Turbulence structure resulting from interaction between an embedded vortex and wall jet found in the catalog.

Turbulence structure resulting from interaction between an embedded vortex and wall jet

James G. Green

Turbulence structure resulting from interaction between an embedded vortex and wall jet

by James G. Green

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Published by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


Edition Notes

ContributionsLigrani, P. M., Subramanian, Chelakara S.
The Physical Object
Pagination213 p.
Number of Pages213
ID Numbers
Open LibraryOL25503737M

Glenn R. Flierl's research works with 5, citations and 6, reads, including: Resonant Activation of Population Extinctions.   At the lowest Reynolds number Re = × 10 3, the dual jets can be generally treated as two isolated jets with a good in-phase sweeping motion and a relatively stable jet velocity. One pair of wall vortices develops and interacts in a trade-off manner in the middle region between the two jets.

Interactions of wall jets and vortices embedded in turbulent layers commonly occur near gas turbine blades and endwalls where film cooling is employed. These interactions frequently result in undesirable heat transfer effects at blade and endwall surfaces. In this study, a crossed hot-wire probe is used to measure the turbulence structure resulting from this type of interaction. RDT uses a formalism similar to the acoustic analogy in the sense of determining a Green's function and modelling the unsteady turbulence source structure. But in contrast to jet noise modelling the basic interaction problem is linear and can be solved in terms of a single convected scalar quantity that is an arbitrary function of its arguments.

lated to the shock–turbulence interaction, which is one of the major sources of noise, and has attracted a lot of attention in the literature. An early experimental study of shock vortex interaction was carried out by Hollingsworth and Richards.1 A plane shock wave was generated by a shock tube. As it passed an. The wall vortex interaction noise at high M is also dominant between 0° ≥ θ ≤ 40°as low M vortex ring wall interaction. in the generating jet. Strength of the embedded shock also varies.


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Turbulence structure resulting from interaction between an embedded vortex and wall jet by James G. Green Download PDF EPUB FB2

Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection Turbulence structure resulting from interaction between an embedded vortex and wall jet.

Interactions of wall jets and vortices embedded in turbulent boundary layers commonly occur near gas turbine blades and endwalls where film cooling is employed. These interactions frequently result in undesirable heat transfer effects at blade and endwall : James G. Green. Further studies of turbulence structure resulting from interactions between embedded vortices and wall jets at high blowing ratios - NASA/ADS Interactions of wall jets and vortices embedded in turbulent layers commonly occur near gas turbine blades and endwalls where film cooling is : William D.

Doner. Turbulence structure resulting from interaction between an embedded vortex and wall jet. By James G. Green. Download PDF (10 MB) Abstract. Approved for public release; distribution in ctions of wall jets and vortices embedded in turbulent boundary layers commonly occur near gas turbine blades and endwalls where film cooling is Author: James G.

Green. Barata et al. [11] presented a detailed analysis of the turbulent structure of a ground vortex flow resulting from the collision of a wall jet with a boundary layer, following the work reported in.

Green, Turbulence structure resulting from interactions between an embedded vortex and wall jet. thesis, Department of Mechanical Engineering, U.S. Naval Postgraduate School, Monterey, CA (). The underlying mechanism of jet and wave formation revealed by S3T is the spectrally nonlocal interaction between the large-scale structure and the small-scale turbulence (Farrell and Ioannou ).

S3T is a nonequilibrium statistical theory based on a closure comprising the nonlinear dynamics of the coherent large-scale structure together with. side. It follows that the coefficient of proportionality between the jet radius R and the downstream distance x from the outlet is tan()≃ 1/5: R(x) = 1 5 x.

() Note that since the initial jet radius is not zero but the finite nozzle radius, equal to half the exit diameter d. Other attempts at defining a coherent structure can be done through examining the correlation between their momenta or pressure and their turbulent flows.

However, it often leads to false indications of turbulence, since pressure and velocity fluctuations over a fluid could be well correlated in the absence of any turbulence or vorticity.

Near Wall Region Modeling From a physical point of view: It is important because solid walls are the main source of vorticity and turbulence (local extrema of turbulent kinetic energy, large variations of turbulence dissipation, etc.) In engineering applications: Wall.

shear is created between the entering and ambient fluids, causing turbulence and mixing. Perhaps the most clearly defined jets are those produced when a fluid is discharged in the environment through a relatively narrow conduit, such as an industrial discharge released through a pipe on the bank of a river, lake, or coastal ocean.

Measurement of interaction between the boundary layer, vortex upwash, and the wall jet was made at one station with various blowing ratios. At low blowing ratios (m = and ) the vortex dominates the flow. Significant alterations to the turbulent structure are seen in the Reynolds stress components, vorticity distributions and mean velocities.

3 Notation for the turbulent round jet. Laboratory observations reveal that all turbulent round jets possess the same opening angle, regardless of fluid (air, water, other), orifice diameter (d) and injection speed (U).The universal value is o, yielding a ratio radius-to-distance of 1-to 5.

the jet–wave coexistence regime in barotropic beta-plane turbulence. To probe the jet–wave–turbulence dynamics in more depth, a separation is made between the coherent jets and large-scale waves and the smaller-scale motions, which are considered to constitute the incoherent turbulent component of the flow.

This sep. embedded in a wall turbulent flow were generated using an oriented rectangular continuous or synthetic yet interacting with the main flow. Zhang and Collins [9] examined the development of a longitudinal vortex produced as a result of the interaction between a rectangular continuous jet and a two-dimensional flat plate boundary layer.

They. Turbulence structure resulting from interaction between an embedded vortex and wall jet Year: OAI identifier: oai: The counter-rotating vortex is aligned to the jet trajectory (i.e., almost parallel to the wall for attached coolants) and entrains the hot gas from the sides toward the wall and eject the flow away from the wall near the centerline of the jet.

This mechanism plays very important role in. A longitudinal vortex in a flat-plate turbulent boundary layer was examined in a wind tunnel experiment using Laser Doppler Anemometry. The vortex was produced by an inclined round jet (D = 14 mm) in the turbulent boundary layer (δ ≈ 25 mm).

The jet nozzle was positioned at pitch and skew angles of 45 deg to the oncoming stream, and the jet speed ratios (jet speed/freestream flow speed. We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising.

For further information, including about cookie. The resulting flow configuration has applications in turbomachinery, for example, to intensify the local heat transfer at turbine disks.

The experiments cover separate measurements of the disk-wall flow, the jet flow and interaction between the two. This vortex forms through the interaction of the channel flow and the high velocity wall jet that flows radially outward from the jet impingement point (B) on the cube’s top surface.

From the mean velocity field in the symmetry plane (z / H = 0) that is shown in Fig. 7a, it is seen that the core of this vortex is located at x / H = Jet in a cross-flow (JICF) is a flow arrangement found in many engineering applications, especially in gas turbine air–fuel mixing.

Understanding of scalar mixing in JICF is important for low NO x burner design and operation, and numerical simulation techniques can be used to understand both spatial and temporal variation of air–fuel mixing quality in such applications.left behind a jet plane that seems chaotic, but does not diffuse for miles is then not turbulent.

– Turbulent flows always occur at high Reynolds numbers. They are caused by the complex interaction between the viscous terms and the inertia terms in the momentum equations. – Turbulent flows are rotational ; that is, they have non-zero.