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Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Turbulent jet flows"

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Akin, J. E., and J. Bass. "Asymmetric turbulent jet flows." Computer Methods in Applied Mechanics and Engineering 191, no. 6-7 (December 2001): 515–24. http://dx.doi.org/10.1016/s0045-7825(01)00299-7.

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2

Polezhaev, Yu V., A. V. Korshunov, and G. V. Gabbasova. "Turbulence and turbulent viscosity in jet flows." High Temperature 45, no. 3 (June 2007): 334–38. http://dx.doi.org/10.1134/s0018151x07030091.

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3

Erdil, A., H. M. Ertunc, and T. Yilmaz. "Decomposition of forced turbulent jet flows." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, no. 4 (December 11, 2008): 919–33. http://dx.doi.org/10.1243/09544062jmes1173.

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In many cases, turbulence is superimposed on an unsteady organized motion of a mean flow. Indeed, large ranges of scales are involved in these flows, and it is important to investigate their characteristics and interactions. Thus, the time—frequency decomposition provided by the wavelet analysis appears an efficient tool that complements the classical approach and the Fourier transform. In this study, the wavelet decomposition (WD) method has been applied to the forced turbulent jet flows. The obtained results of the WD are compared with those of the other most common techniques such as proper orthogonal decomposition and phase averaging. In addition, the spectrogram of the signals has been presented for a visual representation of the frequency contents. It is shown that the WD is a successful tool to decompose the forced turbulent jet flows into its components for various axial distances, Re numbers, and forcing frequencies.
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4

Mostafa, A. A. "Turbulent Diffusion of Heavy-Particles in Turbulent Jets." Journal of Fluids Engineering 114, no. 4 (December 1, 1992): 667–71. http://dx.doi.org/10.1115/1.2910083.

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The turbulent dispersion of heavy suspended particles in turbulent shear flows is analyzed when crossing trajectory effects are important. A semiempirical expression for particle diffusion coefficient is developed via a comparison with experimental data of two-phase turbulent jet flows. This expression gives the particle momentum diffusion coefficient in terms of the gas diffusion coefficient, mean relatively velocity, and root mean square of the fluctuating fluid velocity. The proposed expression is used in a two-phase flow mathematical model to predict different particle-laden jet flows. The good agreement between the predictions and data suggests that the developed expression for particle diffusion coefficient is reasonably accurate in predicting particle dispersion in turbulent free shear flows.
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5

NICKELS, T. B., and IVAN MARUSIC. "On the different contributions of coherent structures to the spectra of a turbulent round jet and a turbulent boundary layer." Journal of Fluid Mechanics 448 (November 26, 2001): 367–85. http://dx.doi.org/10.1017/s002211200100619x.

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This paper examines and compares spectral measurements from a turbulent round jet and a turbulent boundary layer. The conjecture that is examined is that both flows consist of coherent structures immersed in a background of isotropic turbulence. In the case of the jet, a single size of coherent structure is considered, whereas in the boundary layer there are a range of sizes of geometrically similar structures. The conjecture is examined by comparing experimental measurements of spectra for the two flows with the spectra calculated using models based on simple vortex structures. The universality of the small scales is considered by comparing high-wavenumber experimental spectra. It is shown that these simple structural models give a good account of the turbulent flows.
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6

Alekseenko, Sergey, Artur Bilsky, Vladimir Dulin, Boris Ilyushin, and Dmitriy Markovich. "TURBULENT ENERGY BALANCE IN FREE AND CONFINED JET FLOWS(Free and Confined Jet)." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2005 (2005): 281–86. http://dx.doi.org/10.1299/jsmeicjwsf.2005.281.

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7

Stoellinger, Michael K., Stefan Heinz, Celestin P. Zemtsop, Harish Gopalan, and Reza Mokhtarpoor. "Stochastic-Based RANS-LES Simulations of Swirling Turbulent Jet Flows." International Journal of Nonlinear Sciences and Numerical Simulation 18, no. 5 (July 26, 2017): 351–69. http://dx.doi.org/10.1515/ijnsns-2016-0069.

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AbstractMany turbulent flow simulations require the use of hybrid methods because LES methods are computationally too expensive and RANS methods are not sufficiently accurate. We consider a recently suggested hybrid RANS-LES model that has a sound theoretical basis: it is systematically derived from a realizable stochastic turbulence model. The model is applied to turbulent swirling and nonswirling jet flow simulations. The results are shown to be in a very good agreement with available experimental data of nonswirling and mildly swirling jet flows. Compared to commonly applied other hybrid RANS-LES methods, our RANS-LES model does not seem to suffer from the ’modeled-stress depletion’ problem that is observed in DES and IDDES simulations of nonswirling jet flows, and it performs better than segregated RANS-LES models. The results presented contribute to a better physical understanding of swirling jet flows through an explanation of conditions for the onset and the mechanism of vortex breakdown.
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8

Alvani, R. F., and M. Fairweather. "Ignition Characteristics Of Turbulent Jet Flows." Chemical Engineering Research and Design 80, no. 8 (November 2002): 917–23. http://dx.doi.org/10.1205/026387602321143471.

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9

Louda, Petr, Jaromír Příhoda, and Karel Kozel. "Numerical solution of turbulent jet flows." PAMM 8, no. 1 (December 2008): 10629–30. http://dx.doi.org/10.1002/pamm.200810629.

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10

Walker, D. T., C. Y. Chen, and W. W. Willmarth. "Turbulent structure in free-surface jet flows." Journal of Fluid Mechanics 291 (May 25, 1995): 223–61. http://dx.doi.org/10.1017/s0022112095002680.

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Results of an experimental study of the interaction of a turbulent jet with a free surface when the jet issues parallel to the free surface are presented. Three different jets, with different exit velocities and jet-exit diameters, all located two jet-exit diameters below the free surface were studied. At this depth the jet flow, in each case, is fully turbulent before significant interaction with the free surface occurs. The effects of the Froude number (Fr) and the Reynolds number (Re) were investigated by varying the jet-exit velocity and jet-exit diameter. Froude-number effects were identified by increasing the Froude number from Fr = 1 to 8 at Re = 12700. Reynolds-number effects were identified by increasing the Reynolds number from Re = 12700 to 102000 at Fr = 1. Qualitative features of the subsurface flow and free-surface disturbances were examined using flow visualization. Measurements of all six Reynolds stresses and the three mean velocity components were obtained in two planes 16 and 32 jet diameters downstream using a three-component laser velocimeter. For all the jets, the interaction of vorticity tangential to the surface with its ‘image’ above the surface contributes to an outward flow near the free surface. This interaction is also shown to be directly related to the observed decrease in the surface-normal velocity fluctuations and the corresponding increase in the tangential velocity fluctuations near the free surface. At high Froude number, the larger surface disturbances diminish the interaction of the tangential vorticity with its image, resulting in a smaller outward flow and less energy transfer from the surface-normal to tangential velocity fluctuations near the surface. Energy is transferred instead to free-surface disturbances (waves) with the result that the turbulence kinetic energy is 20% lower and the Reynolds stresses are reduced. At high Reynolds number, the rate of evolution of the interaction of the jet with the free surface was reduced as shown by comparison of the rate of change with distance downstream of the local Reynolds and Froude numbers. In addition, the decay of tangential vorticity near the surface is slower than for low Reynolds number so that vortex filaments have time to undergo multiple reconnections to the free surface before they eventually decay.
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Дисертації з теми "Turbulent jet flows"

1

Mastorakos, Epaminondas. "Turbulent combustion in opposed jet flows." Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/11820.

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2

Müller, Sebastian. "Numerical investigations of compressible turbulent swirling jet flows." kostenfrei, 2007. http://e-collection.ethbib.ethz.ch/view/eth:30052.

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3

Pouransari, Zeinab. "Numerical studies of turbulent flames in wall-jet flows." Doctoral thesis, KTH, Turbulens, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160609.

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The present thesis deals with the fundamental aspects of turbulent mixing and non-premixed combustion in the wall-jet flow, which has a close resemblance to many industrial applications. Direct numerical simulations (DNS) of turbulent wall-jets with isothermal and exothermic reactions are performed. In the computational domain, fuel and oxidizer enter separately in a nonpremixed manner and the flow is compressible, fully turbulent and subsonic. The triple “turbulence-chemistry-wall” interactions in the wall-jet flow have been addressed first by focusing on turbulent flow effects on the isothermal reaction, and then, by concentrating on heat-release effects on both turbulence and flame characteristics in the exothermic reaction. In the former, the mixing characteristics of the flow, the key statistics for combustion and the near-wall effects in the absence of thermal effects are isolated and studied. In the latter, the main target was to identify the heat-release effects on the different mixing scales of turbulence. Key statistics such as the scalar dissipation rates, time scale ratios, two-point correlations, one and two-dimensional premultiplied spectra are used to illustrate the heat release induced modifications. Finer small mixing scales were observed in the isothermal simulations and larger vortical structures formed after adding significant amounts of heat-release. A deeper insight into the heat release effects on three-dimensional mixing and reaction characteristics of the turbulent wall-jet flow has been gained by digging in different scales of DNS datasets. In particular, attention has been paid to the anisotropy levels and intermittency of the flow by investigating the probability density functions, higher order moments of velocities and reacting scalars and anisotropy invariant maps for different reacting cases. To evaluate and isolate the Damkohler number effects on the reaction zone structure from those of the heat release a comparison between two DNS cases with different Damkohler numbers but a comparable temperature rise is performed. Furthermore, the wall effects on the flame and flow characteristics, for instance, the wall heat transfer; the near-wall combustion effects on the skin-friction, the isothermal wall cooling effects on the average burning rates and the possibility of formation of the premixed mode within the non-premixed flame are addressed. The DNS datasets are also used for a priori  analysis, focused on the heat release effects on the subgrid-scale (SGS) statistics. The findings regarding the turbulence small-scale characteristics, gained through the statistical analysis of the flow have many phenomenological parallels with those concerning the SGS statistics. Finally, a DNS of turbulent reacting wall-jet at a substantially higher Reynolds number is performed in order to extend the applicability range for the conclusions of the present study and figuring out the possible differences.

QC 20150225

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4

Kakhi, M. "The transported probability density function approach for predicting turbulent combusting flows." Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/8729.

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5

Rana, Zeeshan Ahmed. "Implicit LES of turbulent compressible high-speed flows with transverse jet injection." Thesis, Cranfield University, 2011. http://dspace.lib.cranfield.ac.uk/handle/1826/7218.

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Implicit Large Eddy Simulation (ILES) has rapidly emerged as a powerful technique which is utilised to explore the unsteady compressible turbulent flows. Apart from o ering accuracy in numerical simulations, ILES is also computationally e cient compared to Direct Numerical Simulations or conventional Large Eddy Simulations. This report focuses on the validation of the existing high-resolution methods within the framework of ILES and explores its applications to the high-speed compressible turbulent flows such as a typical flow field inside a scramjet engine. The methodology applied in the current work employs a fifth-order MUSCL scheme with a modified variable extrapolation and a three-stage second-order Runge-Kutta scheme for temporal advancement. In order to simulate a realistic and accurate supersonic turbulent boundary layer (STBL) a synthetic turbulent inflow data generation method based upon digital filters has been implemented. This technique has been validated and compared against various other turbulent inflow data generation methods in order to find the most accurate, reliable and computationally e cient technique. The high-speed complex multi-species flow of a transverse sonic jet injection into a supersonic crossflow (JISC), which is typical fuel injection strategy inside a scramjet engine, has been investigated for time-averaged and instantaneous flow. It has been demonstrated that the incoming STBL plays a vital role in establishing the correct flow dynamics in JISC study as it enhances the KH instabilities in the flow field. Thermally perfect gas formulation has been implemented according to the NACA- 1135 report to study the e ects of high temperatures on the ratio of specific heats ( ). Using this, the full geometry of the HyShot-II scramjet engine is investigated to obtain the inflow conditions for the HyShot-II combustion chamber. Although the design of HyShot-II allowed to disgorge the shock and boundary layer which could otherwise enter the combustion chamber, but, it has been demonstrated that the flow field inside the combustion chamber still consists of a weak shock-train. Finally, the hydrogen injection is analysed inside the HyShot-II combustion chamber, with the shock-train travelling inside and the incoming STBL using digital filters based technique, to explore various time-averaged and instantaneous flow structures and parameters with a view to enhance the understanding of the complex flow field inside the combustion chamber. It is demonstrated from the detailed investigations of a complex high-speed flow that ILES methodology has the potential to develop the understandings of the high-speed compressible turbulent flows using comparatively less computational resources.
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6

Örlü, Ramis. "Experimental studies in jet flows and zero pressure-gradient turbulent boundary layers /." Stockholm : Skolan för teknikvetenskap, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10448.

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7

Smith, Benjamin Scott. "Wall Jet Boundary Layer Flows Over Smooth and Rough Surfaces." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/27597.

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The aerodynamic flow and fluctuating surface pressure of a plane, turbulent, two-dimensional wall jet flow into still air over smooth and rough surfaces has been investigated in a recently constructed wall jet wind tunnel testing facility. The facility has been shown to produce a wall jet flow with Reynolds numbers based on the momentum thickness, Re&delta = &deltaUm/&nu, of between 395 and 1100 and nozzle exit Reynolds numbers, Rej = Umb/&nu, of between 16000 and 45000. The wall jet flow properties (&delta, &delta*, &theta, y1/2, Um, u*, etc.) were measured and characterized over a wide range of initial flow conditions and measurement locations relative to the wall jet source. These flow properties were measured for flow over a smooth flow surface and for flow over roughness patches of finite extent. The patches used in the current study varied in length from 305 mm to 914 mm (between 24 and 72 times the nozzle height, b) and were placed so that the leading edge of the patch was fixed at 1257 mm (x/b = 99) downstream of the wall jet source. These roughness patches were of a random sand grain roughness type and the roughness grain size was varied throughout this experiment. The tests covered roughness Reynolds numbers (k+) ranging from less than 2 to over 158 (covering the entire range of rough wall flow regimes from hydrodynamically smooth to fully rough). For the wall jet flows over 305 mm long patches of roughness, the displacement and momentum thicknesses were found to vary noticeably with the roughness grain size, but the maximum velocity, mixing layer length scale, y1/2, and the boundary layer thickness were not seen to vary in a consistent, determinable way. Velocity spectra taken at a range of initial flow conditions and at several distinct heights above the flow surface showed a limited scaling dependency on the skin friction velocity near the flow surface. The spectral density of the surface pressure of the wall jet flow, which is not believed to have been previously investigated for smooth or rough surfaces, showed distinct differences with that seen in a conventional boundary layer flow, especially at low frequencies. This difference is believed to be due to the presence of a mixing layer in the wall jet flow. Both the spectral shape and level were heavily affected by the variation in roughness grain size. This effect was most notable in overlap region of the spectrum. Attempts to scale the wall jet surface pressure spectra using outer and inner variables were successful for the smooth wall flows. The scaling of the rough wall jet flow surface pressure proved to be much more difficult, and conventional scaling techniques used for ordinary turbulent boundary layer surface pressure spectra were not able to account for the changes in roughness present during the current study. An empirical scaling scheme was proposed, but was only marginally effective at scaling the rough wall surface pressure.
Ph. D.
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8

Küng, Marco. "Large eddy simulation of turbulent channel and jet flows using the approximate deconvolution model." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17466.

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9

Xu, Hongyi. "Large eddy simulation of turbulent flows in square and annular ducts and confined square coaxial jet." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0006/NQ27860.pdf.

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10

Örlü, Ramis. "Experimental studies in jet flows and zero pressure-gradient turbulent boundary layers". Doctoral thesis, KTH, Mekanik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10448.

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This thesis deals with the description and development of two classical turbulent shear flows, namely free jet and flat plate turbulent boundary layer flows. In both cases new experimental data has been obtained and in the latter case comparisons are also made with data obtained from data bases, both of experimental and numerical origin. The jet flow studies comprise three parts, made in three different experimental facilities, each dealing with a specific aspect of jet flows. The first part is devoted to the effect of swirl on the mixing characteristics of a passive scalar in the near-field region of a moderately swirling jet. Instantaneous streamwise and azimuthal velocity components as well as the temperature were simultaneously accessed by means of combined X-wire and cold-wire anemometry. The results indicate a modification of the turbulence structures to that effect that the swirling jet spreads, mixes and evolves faster compared to its non-swirling counterpart. The high correlation between streamwise velocity and temperature fluctuations as well as the streamwise passive scalar flux are even more enhanced due to the addition of swirl, which in turn shortens the distance and hence time needed to mix the jet with the ambient air. The second jet flow part was set out to test the hypothesis put forward by Talamelli & Gavarini (Flow, Turbul. & Combust. 76), who proposed that the wake behind a separation wall between two streams of a coaxial jet creates the condition for an absolute instability. The experiments confirm the hypothesis and show that the instability, by means of the induced vortex shedding, provides a continuous forcing mechanism for the control of the flow field. The potential of this passive mechanism as an easy, effective and practical way to control the near-field of interacting shear layers as well as its effect towards increased turbulence activity has been shown. The third part of the jet flow studies deals with the hypothesis that so called oblique transition may play a role in the breakdown to turbulence for an axisymmetric jet.For wall bounded flows oblique transition gives rise to steady streamwise streaks that break down to turbulence, as for instance documented by Elofsson & Alfredsson (J. Fluid Mech. 358). The scenario of oblique transition has so far not been considered for jet flows and the aim was to study the effect of two oblique modes on the transition scenario as well as on the flow dynamics. For certain frequencies the turbulence intensity was surprisingly found to be reduced, however it was not possible to detect the presence of streamwise streaks. This aspect must be furher investigated in the future in order to understand the connection between the turbulence reduction and the azimuthal forcing. The boundary layer part of the thesis is also threefold, and uses both new data as well as data from various data bases to investigate the effect of certain limitations of hot-wire measurements near the wall on the mean velocity but also on the fluctuating streamwise velocity component. In the first part a new set of experimental data from a zero pressure-gradient turbulent boundary layer, supplemented by direct and independent skin friction measurements, are presented. The Reynolds number range of the data is between 2300 and 18700 when based on the free stream velocity and the momentum loss thickness. Data both for the mean and fluctuating streamwise velocity component are presented. The data are validated against the composite profile by Chauhan et al. (Fluid Dyn. Res. 41) and are found to fulfil recently established equilibrium criteria. The problem of accurately locating the wall position of a hot-wire probe and the errors this can result in is thoroughly discussed in part 2 of the boundary layer study. It is shown that the expanded law of the wall to forth and fifth order with calibration constants determined from recent high Reynolds number DNS can be used to fix the wall position to an accuracy of 0.1 and 0.25 l_ * (l_* is the viscous length scale) when accurately determined measurements reaching y+=5 and 10, respectively, are available. In the absence of data below the above given limits, commonly employed analytical functions and their log law constants, have been found to affect the the determination of wall position to a high degree. It has been shown, that near-wall measurements below y+=10 or preferable 5 are essential in order to ensure a correctly measured or deduced absolute wall position. A  number of peculiarities in concurrent wall-bounded turbulent flow studies, was found to be associated with a erroneously deduced wall position. The effect of poor spatial resolution using hot-wire anemometry on the measurements of the streamwise velocity is dealt with in the last part. The viscous scaled hot-wire length, L+, has been found to exert a strong impact on the probability density distribution (pdf) of the streamwise velocity, and hence its higher order moments, over the entire buffer region and also the lower region of the log region. For varying Reynolds numbers spatial resolution effects act against the trend imposed by the Reynolds number. A systematic reduction of the mean velocity with increasing L+ over the entire classical buffer region and beyond has been found. A reduction of around 0.3 uƬ, where uƬ is the friction velocity, has been deduced for L+=60 compared to L+=15. Neglecting this effect can lead to a seemingly Reynolds number dependent  buffer or log region. This should be taken into consideration, for instance, in the debate, regarding the prevailing influence of viscosity above the buffer region at high Reynolds numbers. We also conclude that the debate concerning the universality of the pdf within the overlap region has been artificially complicated due to the ignorance of spatial resolution effects beyond the classical buffer region on the velocity fluctuations.
QC 20100820
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Книги з теми "Turbulent jet flows"

1

Song, Jin-Min. Studies of confined and unconfined turbulent jet flows. Manchester: University of Manchester, 1996.

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2

Burns, A. D. Numerical prediction of turbulent three dimensional jet flows in rectangular enclosures. Oxfordshire: Computer Science and Systems Division, Harwell Laboratory, 1986.

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3

Jiang, Zhu, Lumley John L. 1930-, and Lewis Research Center. Institute for Computational Mechanics in Propulsion., eds. Modeling of wall-bounded complex flows and free shear flows. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1994.

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4

Chiang, Chu, Lumley John L. 1930-, and Lewis Research Center. Institute for Computational Mechanics in Propulsion., eds. Modeling of wall-bounded complex flows and free shear flows. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1994.

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Chiang, Chu, Lumley John L. 1930-, and Lewis Research Center. Institute for Computational Mechanics in Propulsion., eds. Modeling of wall-bounded complex flows and free shear flows. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1994.

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6

Villasenor, R. Modeling ideally expanded supersonic turbulent jet flows with nonpremixed H2-air combustion. Washington: American Institute of Aeronautics and Astronautics, 1990.

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7

Y, Chen J., Limley J. L, and Lewis Research Center. Institute for Computational Mechanics in Propulsion., eds. Second order modeling of boundary-free turbulent shear flows. Cleveland, Ohio: NASA Lewis Research Center, Institute for Computational Mechanics in Propulsion, 1991.

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8

Ryan, Martyn J. The effect of hydrodynamic stress on plant cell cultures in turbulent jet flows. Dublin: University College Dublin, 1997.

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9

Rubinstein, Robert. Time correlations and the frequency spectrum of sound radiated by turbulent flows. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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10

IUTAM, Symposium (1990 Novosibirsk R. S. F. S. R. ). Separated flows and jets. Berlin: Springer-Verlag, 1991.

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Частини книг з теми "Turbulent jet flows"

1

Mastorakos, E., A. M. K. P. Taylor, and J. H. Whitelaw. "Mixing in Turbulent Opposed Jet Flows." In Turbulent Shear Flows 9, 147–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-78823-9_10.

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2

Gimranov, E. G. "A Jet-Turbulent “Pseudo-Shock” Model." In Separated Flows and Jets, 533–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84447-8_72.

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3

Fric, T. F., and A. Roshko. "Structure in the Near Field of the Transverse Jet." In Turbulent Shear Flows 7, 225–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76087-7_17.

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4

Glauser, Mark N., Stewart J. Leib, and William K. George. "Coherent Structures in the Axisymmetric Turbulent Jet Mixing Layer." In Turbulent Shear Flows 5, 134–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71435-1_13.

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5

Morris, Philip J., and K. Viswanathan. "Jet Noise." In Noise Sources in Turbulent Shear Flows: Fundamentals and Applications, 119–96. Vienna: Springer Vienna, 2013. http://dx.doi.org/10.1007/978-3-7091-1458-2_3.

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6

Ginevsky, A. S., Ye V. Vlasov, and R. K. Karavosov. "Self-Excitation of Turbulent Jet Flows." In Foundations of Engineering Mechanics, 127–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-39914-8_5.

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7

Saripalli, K. R. "Laser Doppler Velocimeter Measurements in 3-D Impinging Twin-Jet Fountain Flows." In Turbulent Shear Flows 5, 146–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71435-1_14.

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8

Meiburg, Eckart, Juan C. Lasheras, and James E. Martin. "Experimental and Numerical Analysis of the Three-Dimensional Evolution of an Axisymmetric Jet." In Turbulent Shear Flows 7, 195–208. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76087-7_15.

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9

Miyata, M., N. Kurita, and I. Nakamura. "Turbulent Plane Jet Excited Mechanically by an Oscillating Thin Plate in the Potential Core." In Turbulent Shear Flows 7, 209–23. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-76087-7_16.

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10

Durão, D. F. G., G. Knittel, J. C. F. Pereira, and J. M. P. Rocha. "Measurements and Modelling of the Turbulent Near Wake Flow of a Disk With a Central Jet." In Turbulent Shear Flows 8, 141–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77674-8_11.

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Тези доповідей конференцій з теми "Turbulent jet flows"

1

Helmer, David B., and Lester K. Su. "Imaging of Turbulent Buoyant Jet Mixing." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16365.

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This paper presents quantitative imaging measurements of jet fluid mole fraction fields in turbulent buoyant jets of helium issuing into air. The measurements use planar laser Rayleigh scattering. Signal levels are low, necessitating a novel approach to background subtraction in the signal processing. The jet flows considered are classified as momentum-driven, meaning that buoyancy effects are presumed to be confined to the small scales of the flow. We focus here on the near-nozzle, developing region of the jet, which is of particular interest to flows with combustion. The results suggest that buoyancy affects the details of the evolution of the mixing field even while the mean field maintains scaling properties consistent with non-buoyant jets. Specifically, the mean jet fluid mole fraction profiles show a sharper jet/ambient fluid interface relative to non-buoyant jets. The mole fraction fluctuations within the jet are also weaker than those reported in non-buoyant jets. These results will inform ongoing efforts to model the mixing process in flows with density differences, such as combustion systems.
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2

Ferrao, Paulo C., Manuel V. Heitor, Mario F. de Matos, and Renato K. Salles. "TURBULENT SCALAR MIXING IN COAXIAL JET FLOWS." In First Symposium on Turbulence and Shear Flow Phenomena. Connecticut: Begellhouse, 1999. http://dx.doi.org/10.1615/tsfp1.1260.

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3

Chernykh, G. G., A. G. Demenkov, and S. N. Yakovenko. "Mathematical models of swirling turbulent jet flows." In INTERNATIONAL CONFERENCE ON THE METHODS OF AEROPHYSICAL RESEARCH (ICMAR 2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5065158.

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4

NALLASAMY, M. "Computation of confined turbulent coaxial jet flows." In 24th Aerospace Sciences Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/6.1986-218.

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5

Ihme, Matthias, and Heinz Pitsch. "EFFECTS OF HEAT RELEASE ON TURBULENT JET FLOWS." In Fifth International Symposium on Turbulence and Shear Flow Phenomena. Connecticut: Begellhouse, 2007. http://dx.doi.org/10.1615/tsfp5.1540.

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6

Zemtsop, Celestin, Michael Stoellinger, Stefan Heinz, and Dan Stanescu. "Swirl-Induced Mixing Enhancement in Turbulent Jet Flows." In 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-1510.

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7

NAMAZIAN, M., J. KELLY, and R. SCHEFER. "Concentration imaging measurements in turbulent concentric-jet flows." In 27th Aerospace Sciences Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-58.

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8

da Silva, Filipe Dutra, Vinícius da Fonseca Pereira, and Widmark Kauê Silva Cardoso. "Prediction of axisymmetric turbulent jet flows using OpenFOAM." In 13th Spring School on Transition and Turbulence. ABCM, 2022. http://dx.doi.org/10.26678/abcm.eptt2022.ept22-0010.

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9

Yoo, Geun Jong, and Won Dae Jeon. "Analysis of Unsteady Turbulent Merging Jet Flows With Temperature Difference." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22235.

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Suitable turbulence model is required in the course of establishing a proper analysis methodology for thermal stripping phenomena. For this purpose, three different turbulence models of k-ε model, modified k-ε model, and full Reynolds stress model and VLES are applied to analyze unsteady turbulent flows with temperature variation. Four test cases are selected for verification. These are vertical jet flows with water and sodium, parallel jet flow with sodium, and merging pipe flow through T-junction with sodium. The geometries of test cases well represent common places where thermal stripping might be occurred. The turbulence model computation shows overall jet flow characteristics well and good comparison of mean temperature distribution. Temperature variance (θ′2) is rather over-predicted, but location of high temperature variance is matched well with that of the large amplitude of temperature variation of experimental results. Meanwhile, mixing of hot and cold jet flow is found to be not that active.
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10

Chen, Qingguang, Zhong Xu, Yulin Wu, and Yongjian Zhang. "Three-Dimensional Simulation of Turbulent Rectangular and Square Impinging Jet Flows." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56131.

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Flow characteristics of turbulent impinging jets issuing, respectively, from a rectangular and a square nozzles have been investigated numerically through the solution of three-dimensional Navier-Strokes equations in steady state. Two geometries with two nozzle-to-plate spacings of four and eight times of hydraulic diameters of the jet pipes, and two Reynolds numbers of 20000 and 30000 have been considered with fully developed inlet boundary conditions. An RNG based k–ε turbulence model and a deferred correction QUICK scheme in conjunction with the wall function method have been applied to the prediction of the flow fields within semi-confined spaces. A common feature revealed by the computational results is the presence of a toroidal recirculation zone around the jet. An adverse pressure gradient is found at the impingement surface downstream the stagnation point. Boundary layer separation will occur if the gradient is strong enough, and the separation manifests itself as a secondary recirculation zone at the surface. In addition, three-dimensional simulations reveal the existence of two and four pronounced streamwise velocity off-center peaks at the cross-planes near to the impingement plate, respectively, in the rectangular and square impinging jet flows. These peaks are found forming at the horizontal planes where the wall jets start forming accompanied by two or four pairs of counter-rotating vortex rings. It is believed that the formation of the off-center velocity peaks is due to the vorticity diffusion along the wall jet as the jet impinges on the target plate.
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Звіти організацій з теми "Turbulent jet flows"

1

Jones, S. C., F. Sotiropoulos, and M. J. Sale. Large-eddy simulation of turbulent circular jet flows. Office of Scientific and Technical Information (OSTI), July 2002. http://dx.doi.org/10.2172/1218155.

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2

Kimber, Mark. Experimental Validation Data and Computational Models for Turbulent Mixing of Bypass and Coolant Jet Flows in Gas-Cooled Reactors. Office of Scientific and Technical Information (OSTI), December 2019. http://dx.doi.org/10.2172/1650667.

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3

Colbert, John E., and Clarence J. Nowack. Evaluation of Thermal Stability Improving Additives for Jet Fuel in Both Laminar and Turbulent Flow Test Units. Fort Belvoir, VA: Defense Technical Information Center, September 2000. http://dx.doi.org/10.21236/ada389293.

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4

Frouzakis, Christos E., George K. Giannakopoulos, Mahmoud Jafargholi, Stefan G. Kerkemeier, Misun Min, Ananias G. Tomboulides, Paul F. Fischer, and Scott Parker. Flow, Mixing and Combustion of Transient Turbulent Gaseous Jets in Confined Cylindrical Geometries. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1483962.

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5

Lyra, Sgouria, B. Wilde, Hemanth Kolla, J. Seitzman, T. C. Lieuwen, and Jacqueline H. Chen. Structure and stabilization of hydrogen-rich transverse jets in a vitiated turbulent flow. Office of Scientific and Technical Information (OSTI), July 2014. http://dx.doi.org/10.2172/1171424.

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6

Dimenna, R. A., and S. Y. Lee. Validation Analysis for the Calculation of a Turbulent Free Jet in Water Using CFDS-FLOW 3-D and FLUENT. Office of Scientific and Technical Information (OSTI), May 1995. http://dx.doi.org/10.2172/122020.

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7

Freedland, Graham. Entrainment Processes for a Jet in Cross-flow: The Quantification of Turbulent Contributions and their Importance on Accurate Modeling. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.7490.

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