Last edited by Jukasa
Monday, July 13, 2020 | History

3 edition of Turbulent swirling jets with exitation found in the catalog.

Turbulent swirling jets with exitation

# Turbulent swirling jets with exitation

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

Subjects:
• Aerodynamics.

• Edition Notes

The Physical Object ID Numbers Statement Rahmat Taghavi and Saeed Farokhi. Series NASA contractor report -- 180895., NASA contractor report -- NASA CR-180895. Contributions Farokhi, Saeed., United States. National Aeronautics and Space Administration. Format Microform Pagination 1 v. Open Library OL15291356M

investigate the structure and dynamics of round turbulent jets. The results suggest that the far­ field region of the jet is dominated by large-scale vortical structures, which appear to be axisymmetric or helical a large part of the time. Entrainment and mixing of the reservoir fluid. Comparison of Turbulent Thermal Diﬀusivity and Scalar Variance Models Dennis A. Yoder∗ NASA Glenn Research Center, Cleveland, OH, , USA In this study, several variable turbulent Prandtl number formulations are examined for boundary layers, pipe ﬂow, and axisymmetric jets. The model formulations include simpleFile Size: 1MB.

We present a unified vision of the existing theoretical models for the turbulent plane jet, leading to new analytical profiles for scalar concentration and turbulent quantities, including a complete turbulent kinetic energy budget. Integrals of the budget terms are also computed. The present model is split into two variants. Both compare fairly well with referenced experimental : D. Violeau. Turbulent jets 11 Turbulent jets issuing from rectangular nozzles 13 Description of the velocity field 14 Mean velocity fields 14 a) Mean streamwise velocity 14 b) Mean lateral velocity 15 c) Mean spanwise velocity 15 d) Spread of rectangular jets 16 e) Decay of centerline mean velocity

Turbulent swirling jets with exitation [microform] / Rahmat Taghavi and Saeed Farokhi; Large amplitude acoustic excitation of swirling turbulent jets [microform] / R. Taghavi, E.J. Rice, S. F Controlled excitation of a cold turbulent swirling free jet [microform] / R. Taghavi, E.J. Rice, and S. TY - GEN. T1 - Measurements of entrainment and mixng in turbulent jets. AU - Dahm, Werner. AU - Dimotakis, P. E. PY - Y1 - N2 - An experimental investigation of entrainment and mixing in the self-similar far field of an axisymmetric free turbulent jet in water is by:

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Turbulent Jets Whenever a moving fluid enters a quiescent body of the same fluid, a velocity 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 industrialFile Size: 1MB.

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 author's first monograph on turbulent jets, indealt solely with a free submerged jet. Since that time, the theory of the turbulent jet has been developed in many published works both in the USSR and abroad: it has been enriched with a large amount of experimental material and has been applied in many new fields of engineering.5/5(2).

tation acoustic pressure for effective turbulent mixing and a consequential jet noise amplification can be taken to be percent of the jet dynamic head at the "correct" Strouhal number. The objective of the present investigation is to obtain a basic under- standing of the response of cold swirling turbulent free jets to acoustic exci- tation.

Turbulent Jets and Plumes: A Lagrangian Approach, Volume 1 Joseph Hun-wei Lee, Vincent Chu, Vincent H. Chu Limited preview - All Book Search results ».

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 5File Size: KB.

Search in this book series. Turbulent Jets. Edited by N. Rajaratnam. Volume 5, Pages ii-vi, () Download full volume. Previous volume. Next volume. Actions for selected chapters. Select all / Deselect all. Download PDFs Export citations.

Show all chapter previews Show all chapter previews. The author's first monograph on turbulent jets, indealt solely with a free submerged jet. Since that time, the theory of the turbulent jet has been developed in many published works both in the USSR and abroad: it has been enriched with a large amount of experimental material and has been applied in many new fields of engineering.

In the last 10 years very substantial progress has been. Purchase Turbulent Buoyant Jets and Plumes - 1st Edition. Print Book & E-Book. ISBNBook Edition: 1. Measurements in the far field of swirling round jets [4,7,8] suggest that these flows are evolving in a self-similar manner.

It is demonstrated here the first order momentum equations and transport equations for the turbulent Reynolds stresses have internally consistent self-similar by: Abstract. A jet is the flow generated by a continuous source of momentum.

The Reynolds number of a jet can be conveniently defined as $$Re = \frac{{u_o D}} {v}$$ where u o = jet velocity; D = jet diameter; v = kinematic viscosity of the fluid. Experiments have shown that if Re exceeds aboutthe jet flow will be turbulent.

In most problems of concern to the engineer, the Reynolds number. Elsner J.W., Drobniak S. () Turbulence Structure in Swirling Jets. In: Dumas R., Fulachier L.

(eds) Structure of Complex Turbulent Shear Flow. International Union of Theoretical and Applied by: 4. D jets are turbulent. It is a bit diﬃcult to deﬁne exactly where the transition occurs as it depends on the exact conditions of the ﬂow at the oriﬁce. Jets begin to exhibit turbulent behavior at relatively low Re D, as low asbut the fundamental parameters that characterize the turbulent round jet (to be deﬁnedFile Size: KB.

TY - GEN. T1 - Modified theories of laminar and turbulent swirling jets. AU - Sohrab, Siavash H. PY - /1/1. Y1 - /1/1. N2 - Scale-invariant forms of mass, energy, and linear momentum conservation equations in chemically reactive fields are : Siavash H Sohrab.

The effect of swirl on the impingement surface heat transfer is experimentally investigated in incompressible turbulent (Re = 11,–35,) impinging air jets. Turbulent Jets: Theory and Models Environmental Hydraulics Definitions Jet = boundary layer flow originating from a source of momentum Plume = boundary layer flow originating from a source of buoyancy Buoyant jet (forced plume) = boundary layer flow originating from a source of momentum and buoyancy Boundary layer: high rate of change across someFile Size: 1MB.

An infrared methodology to spatially and temporally resolve transient heat transfer is presented and tested on turbulent impinging (cooling) jets (non-swirling, swirling, Re = 11, to 35, S. Purchase Turbulent Jets, Volume 5 - 1st Edition.

Print Book & E-Book. ISBNBook Edition: 1. nism of swirling turbulent jets. Reynolds-averaged Navier–Stokes (RANS) methods represent the most efﬁcient methodology for the calculationofturbulentﬂows,buttheuseofstandardRANSmethods for swirling jet ﬂow simulations has, to date, turned out to be inap.

Phase-averaged characterization of turbulent isothermal free swirling jet after vortex breakdown R. 1Sharma1,*, F. Cozzi, A. Coghe1 the instantaneous flow field close to the nozzle exit for non-swirling (S=0) and a high swirling jets (S=) both with a Reynolds number of At swirl level ofthe velocity maps evidenced the.

Turbulent Swirling Jets V. Tesař Helicity offers an alternative approach to investigations of the structure of turbulent flows. Knowledge of the spatial distribution of the time-mean component of helicity is the starting point.

Yet very little is known even about basic cases in which Helicity plays important role, such as Cited by: 2. I am interested in simulating turbulent jets with a 3D solver I've been working on. I was curious if anyone has suggestions on what I should use as an inlet condition.

So far I'm using Gaussian noise where my standard deviation is equal to the maximum velocity. I am also setting u, v, w, p = 0 for my initial condition.Theory of Jets Division of Safety and Fire Engineering, School of Engineering, CUSAT 2 THEORY OF JETS Introduction Overview of Jet Flows Structure and Development of a Free Jet Factors Influencing Jet Spread Conclusion Introduction In this chapter, the basic jet theory is explained in detail.