Готові списки джерел за темами / Turbulent swirling

Добірка наукової літератури з теми "Turbulent swirling"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Turbulent swirling"

1

Nejad, A. S., S. P. Vanka, S. C. Favaloro, M. Samimy, and C. Langenfeld. "Application of Laser Velocimetry for Characterization of Confined Swirling Flow." Journal of Engineering for Gas Turbines and Power 111, no. 1 (January 1, 1989): 36–45. http://dx.doi.org/10.1115/1.3240225.

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Анотація:
A two-component LDV was used in a cold flow dump combustor model to obtain detailed mean and turbulence data for both swirling and nonswirling inlet flows. Large samples were collected to resolve the second and third-order products of turbulent fluctuations with good accuracy. Particle interarrival time weighting was used to remove velocity bias from the data. The swirling flows, with and without vortex breakdown, exhibited significantly different mean flow and turbulent field behavior. A numerical scheme with the k–ε closure model was used to predict the flow fields. Comparison of the numerical and experimental results showed that the k–ε turbulence model is inadequate in representing the complex turbulent structure of confined swirling flows.
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2

Yang, Xingtuan, Nan Gui, Gongnan Xie, Jie Yan, Jiyuan Tu, and Shengyao Jiang. "Anisotropic Characteristics of Turbulence Dissipation in Swirling Flow: A Direct Numerical Simulation Study." Advances in Mathematical Physics 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/657620.

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This study investigates the anisotropic characteristics of turbulent energy dissipation rate in a rotating jet flow via direct numerical simulation. The turbulent energy dissipation tensor, including its eigenvalues in the swirling flows with different rotating velocities, is analyzed to investigate the anisotropic characteristics of turbulence and dissipation. In addition, the probability density function of the eigenvalues of turbulence dissipation tensor is presented. The isotropic subrange of PDF always exists in swirling flows relevant to small-scale vortex structure. Thus, with remarkable large-scale vortex breakdown, the isotropic subrange of PDF is reduced in strongly swirling flows, and anisotropic energy dissipation is proven to exist in the core region of the vortex breakdown. More specifically, strong anisotropic turbulence dissipation occurs concentratively in the vortex breakdown region, whereas nearly isotropic turbulence dissipation occurs dispersively in the peripheral region of the strong swirling flows.
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3

Yan, Jie, Nan Gui, Gongnan Xie, and Jinsen Gao. "Direct Numerical Simulation and Visualization of Biswirling Jets." Advances in Mechanical Engineering 6 (January 1, 2014): 193731. http://dx.doi.org/10.1155/2014/193731.

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Анотація:
Two parallel swirling/rotating jets with a distance between them are termed biswirling jets here, which have important and complicated vortex structures different from the single swirling jet due to the negligible vortex-vortex interactions. The visualization of vortex-vortex interaction between the biswirling jets is accomplished by using direct numerical simulation. The evolution of vortex structures of the biswirling jets is found rather complicated. The turbulent kinetic energy and turbulence dissipation in the central convergence region are augmented locally and rather strongly. The modulation of turbulent kinetic energy by jet-jet interaction upon different scales of vortices is dominated by the swirling levels and the distance between the jets. The turbulent kinetic energy upon intermediate and small scale vortices in bijets with not very high swirling level and at a very close distance is smaller than that in single swirling jets, whereas the opposite is true under a far distance, and so forth.
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4

Xu, Wenkai, Nan Gui, Liang Ge, and Jie Yan. "Direct Numerical Simulation of Twin Swirling Flow Jets: Effect of Vortex-Vortex Interaction on Turbulence Modification." Journal of Computational Engineering 2014 (July 9, 2014): 1–14. http://dx.doi.org/10.1155/2014/313201.

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Анотація:
A direct numerical simulation (DNS) was carried out to study twin swirling jets which are issued from two parallel nozzles at a Reynolds number of Re = 5000 and three swirl levels of S = 0.68, 1.08, and 1.42, respectively. The basic structures of vortex-vortex interaction and temporal evolution are illustrated. The characteristics of axial variation of turbulent fluctuation velocities, in both the near and far field, in comparison to a single swirling jet, are shown to explore the effects of vortex-vortex interaction on turbulence modifications. Moreover, the second order turbulent fluctuations are also shown, by which the modification of turbulence associated with the coherent or correlated turbulent fluctuation and turbulent kinetic energy transport characteristics are clearly indicated. It is found that the twin swirling flow has a fairly strong localized vortex-vortex interaction between a pair of inversely rotated vortices. The location and strength of interaction depend on swirl level greatly. The modification of vortex takes place by transforming large-scale vortices into complex small ones, whereas the modulation of turbulent kinetic energy is continuously augmented by strong vortex modification.
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5

Nazarov, F. Kh. "Comparing Turbulence Models for Swirling Flows." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 2 (95) (April 2021): 25–36. http://dx.doi.org/10.18698/1812-3368-2021-2-25-36.

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Анотація:
The paper considers a turbulent fluid flow in a rotating pipe, known as the Taylor --- Couette --- Poiseuille flow. Linear RANS models are not suitable for simulating this type of problems, since the turbulence in these flows is strongly anisotropic, which means that solving these problems requires models accounting for turbulence anisotropy. Modified linear models featuring corrections for flow rotations, such as the SARC model, make it possible to obtain satisfactory solutions. A new approach to turbulence problems has appeared recently. It allowed a novel two-fluid turbulence model to be created. What makes this model different is that it can describe strongly anisotropic turbulent flows; moreover, it is easy to implement numerically while not being computationally expensive. We compared the results of solving the Taylor --- Couette --- Poiseuille flow problem using the novel two-fluid model and the SARC model. The numerical investigation results obtained from the novel two-fluid model show a better agreement with the experimental data than the results provided by the SARC model
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6

Stepanov, Rodion, Peter Frick, Vladimir Dulin, and Dmitriy Markovich. "Analysis of mean and fluctuating helicity measured by TomoPIV in swirling jet." EPJ Web of Conferences 180 (2018): 02097. http://dx.doi.org/10.1051/epjconf/201818002097.

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Анотація:
Important role of helicity was theoretically predicted for the generation of large-scale magnetic fields and atmospheric vortices. Helicity can lead to a reduction of turbulent dissipation in the atmosphere or in a specific constrained flow, e.g. in pipe. We use the TomoPIV data (42 cube of grid points, resolution 0.84 mm) to measure 3D velocity field of turbulent swirling flows. We study spatial distribution of the mean and fluctuating components of energy and helicity. We find that helical turbulence excitation and decay along stream of the jet strongly depend on the inflow swirl. We observe spatial separation of turbulent flow with different sign of helicity while integrated values are conserves. It is shown that large scale swirling flow induces helicity at the small scales. Our results bring valuable materials for benchmark the modern numerical simulations with turbulent closure technique.
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7

Gomez, L., R. Mohan, and O. Shoham. "Swirling Gas–Liquid Two-Phase Flow—Experiment and Modeling Part II: Turbulent Quantities and Core Stability." Journal of Fluids Engineering 126, no. 6 (November 1, 2004): 943–59. http://dx.doi.org/10.1115/1.1849254.

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Анотація:
In Part I of this two-part paper on swirling gas–liquid two-phase flow, correlations have been developed for the continuous liquid-phase velocity field under swirling conditions, such as that occurring in the lower part of the Gas–Liquid Cylindrical Cyclone (GLCC©1) compact separator. The developed correlations, including the axial, tangential, and radial velocity distributions, are applicable for swirling flow in both cyclones and pipe flow. The first objective of this paper is to extend the study of Part I by developing correlations for the turbulent quantities of the continuous liquid phase, including the turbulent kinetic energy and its dissipation rate and Reynolds shear stresses. The second objective is to study experimentally and theoretically two-phase swirling flow gas-core characteristics and stability. The first objective has been met utilizing local LDV measurements acquired for swirling flow. The developed turbulent quantities correlations have been tested against data from other studies, showing good agreement. For the second objective, experimental data have been acquired under swirling two-phase flow conditions. A model for the prediction of the gas-core diameter and stability in swirling flow field has been developed, based on the turbulent kinetic energy behavior predicted by the developed correlations. Good agreement is observed between the model predictions and the data.
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8

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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9

Riahi, A., and P. G. Hill. "Turbulent Swirling Flow in Short Cylindrical Chambers." Journal of Fluids Engineering 115, no. 3 (September 1, 1993): 444–51. http://dx.doi.org/10.1115/1.2910158.

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Turbulent swirling flow in a short closed cylindrical chamber has been measured with laser Doppler anemometry. The swirl was generated by a rotating roughened disk and measured during steady and transient conditions with a smooth disk. The velocity and turbulence fields were found to be strongly dependent on swirl Reynolds numbers (in the range 0.3 × 106 < ΩR2/v < 0.6 × 106) and on chamber length-to-diameter ratio (in the range 0.1 ≤ L/D ≤ 0.5). With a roughened disk the flow was nearly independent of Reynolds number though still strongly dependent on chamber length-to-diameter ratio.
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10

Schutz, W. M., and J. W. Naughton. "Wake rotation impacts on wake decay." Journal of Physics: Conference Series 2265, no. 2 (May 1, 2022): 022090. http://dx.doi.org/10.1088/1742-6596/2265/2/022090.

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Abstract This study considers the behavior of a well-conditioned swirling turbulent wake. A custom swirling wake generator was used to produce a swirling wake absent of a tower that complicates the flow regime. Four swirling wakes were studied with swirl numbers ranging from 0.19 to 0.37 and compared to a non-swirling counterpart. Two-component Laser-Doppler Anemometry was used to measure mean and turbulent quantities in the wake. Measured profiles were analyzed based on similarity theory applied to a swirling wake. The results show that wake behavior was impacted by the initial swirl strength. Generally, wake growth rate and axial deficit decay rate increased with higher levels of swirl, and tangential velocity decay rate increased with lower levels of swirl. However, the wake that diffused fastest was the case with a swirl number of 0.27.
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Дисертації з теми "Turbulent swirling"

1

Jones, Lee Nicholas. "Modelling of turbulent swirling flows." Thesis, University of Leeds, 2004. http://etheses.whiterose.ac.uk/1192/.

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This thesis investigates the predictability of non-reacting and reacting anistropic turbulent, swirling flows using popular turbulence models with a robust numrical procedure. The performance of these turbulence models is assessed and compared against experimental data for anisotropic, turbulent swirling flow in a cylindrical pipe and non-reacting and reacting combustion chambers. The transport equations for title k -e and k - w two-equation turbulence models are presented along with the LRR and SSG second-moment closure models for isothermal and variable density flows. The effect of anisotropy in the Reynolds stress dissipation rate tensor is accounted for by the inclusion of an algebraic model for the dissipation anistropy tensor dependent 0n the mean strain and vorticity of the flow. The implementation of the SMART and CUBISTA boundedness preserving, high order accurate convective discretisation schemes is shown to yield superior predictive accuracy compared to previous methods such as Upwinding. The PISO and SIMPLE solution algorithms are employed to provide a robust calculation procedure. The second moment closure models are found to provide increased predictive accuracy compared to those of the two-equation models. Mean flow properties are predicted well, capturing the effects of the swirl in the experimental flow field. The LRR model shows a premature decay of swirl downstream compared to the more accurate predictions of the other models. The effect of dissipation anistropy on the SSG model shows an over-prediction of the turbulent properties in the upstream region followed by premature decay downstream. In the near field of the non-reacting combustion chamber flow, the anisotropic dissipation model corrects the SSG model over-prediction of the veloocities at the central axis. A combined CMC flamelet combustion model is employed alongside the anisotropic dissipation Reynolds stress model to predict the flow field and combustion related properties of the TECFLAM swirl burner. The species mass fractions are conditioned on the mixture fraction to provide an accurate model for the determination of the probability density functions governing the reactions within the turbulent flamelet. The turbulent model shows an ability to provide accurate predictinS for the aerodynamic properties of the flow whilst providing accurate determination of combustion related phenomena alongside the combnstion model. A limitation of the flamelet assumption was identified with the over-prediction of CO due to the larger lengthscales of the oxidation reactions present in such flows.
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2

Zhang, Huangwei. "Extinction in turbulent swirling non-premixed flames." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/254974.

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Анотація:
This thesis investigates the localized and global extinction in turbulent swirling non-premixed flames with Large Eddy Simulation (LES) and sub-grid scale Conditional Moment Closure (CMC) model. The first part of this thesis describes the derivations of the three dimensional conservative CMC governing equations and their finite volume discretization for unstructured mesh. The parallel performance of the newly developed CMC code is assessed. The runtime data coupling interface between the 3D-CMC and LES solvers is designed and the different solvers developed during the course of this research are detailed. The aerodynamics of two swirling non-reacting flows from the Sydney and Cambridge burners are first simulated. The main ow structures (e.g. the recirculating zones) in both cases are correctly predicted. The sensitivity analysis about the influences of turbulent inlet boundary, computational domain and mesh refinement on velocity statistics is conducted. This analysis acts as the preparatory investigation for the following flame simulations. The Sydney swirl diluted methane flame, SMA2, is then simulated for validating the LES/3D-CMC solvers. Excellent agreements are achieved in terms of velocity and mixture fraction statistics, averaged reactive scalars in both physical and mixture fraction space. The local extinction level from the increased central fuel velocity is reasonably predicted. At the experimental blow-off point, the LES/3D-CMC modelling does not obtain the occurrence of complete extinction, but severe extinction occurs at the flame base, qualitatively in line with experimental observations. Localized extinction features of a non-premixed methane flame in the Cambridge swirl burner are investigated and it is found that the occurrence of local extinction is typically manifested by low heat release rate and hydroxyl mass fraction, as well as low or medium temperature. It is also accompanied by high scalar dissipation rates. In mixture fraction space, the CMC cells undergoing local extinction have relatively wide scatter between inert and fully burning solutions. The PDFs of reactedness at the stoichiometric mixture fraction demonstrate some extent of bimodality, showing the events of local extinction and reignition and their relative occurrence frequency. Local extinction near the bluff body in the Cambridge swirl burner is also studied. The convective wall heat loss is included as a source term in the conditionally filtered total enthalpy equation. It shows a significant influence on the mean flame structures, directly linked to the changes of the conditional scalar dissipation near the wall. Furthermore, the degree of local extinction near the bluff body surface is intensified because of the wall heat loss. However, the wall heat loss shows a relatively small influence on the statistics of lift-off height. Finally, the blow-off conditions and dynamics in the Cambridge swirl burner are investigated. The blow-off critical air bulk velocity from LES/3D-CMC is over-predicted, greater than the experimental one by at most 25%. The predicted blow-off transient lasts finitely long duration quantified by the blow-off time, in good agreement with the experimental results. The reactive scalars in both physical and mixture fraction space demonstrate different transient behaviors during blow-off process. When the current swirling flame is close to blow-off, high-frequency and high-amplitude fluctuations of the conditionally filtered stoichiometric scalar dissipation rate on the iso-surfaces of the filtered stoichiometric mixture fraction are evident. The blow-off time from the computations is found to vary with different operating conditions.
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3

Riahi, Ardeshir. "Turbulent swirling flow in short cylindrical chambers." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30810.

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Анотація:
The effects of aspect ratio (L/D) on the rate of decay of swirl in a cylindrical chamber were experimentally studied using the Laser-Doppler-Anemometry technique. Preliminary measurements revealed that water should be used as working fluid; the results pertaining to air were inferred from Reynolds number similarity. The steady-state measurements revealed that a solid body type of rotation can be generated by a disc whose surface has been uniformly roughened. The effect of aspect ratio on the rate of decay of such flow field was studied in three chambers with aspect ratios in the range of interest to engine combustion. Experimental results showed a faster decay rate in the shorter chamber (i.e. smaller aspect ratio). This was attributed to the stronger swirl driven secondary flow pattern in the shorter chamber. A mathematical model describing axi-symmetric, decaying, turbulent swirling flow inside a short cylindrical chamber was also developed. The model was numerically solved, using the control-volume analysis, to provide insight on swirl decay in engines. The model validation was based on experimental observations. Turbulence parameters were represented by a two-equation turbulence model, modified for streamline curvature effects. The ad-hoc curvature modification of the standard k-e model proposed by Launder et al. and the mixing energy model developed by Saffman-Wilcox-Traci (SWT) were used to account for curvature effects. The analysis of steady flow between two long concentric cylinders, established the superiority of the latter over the former method. The SWT model was also successfully used in reproducing previously published experimental results, pertaining to decaying swirling flow field (mean velocity and turbulence intensity) in a short cylinder. The calculated turbulence intensity profile revealed that swirl promotes anisotropic turbulence. The validated numerical model was used to predict the effect of aspect ratio on the rate of decay of the flow field observed by the experimental measurements in the present study. The overall prediction of decay rate was successful, leading to the conclusion that Wilcox and Chambers model can be used in predicting the behaviour of two-dimensional transient turbulent swirling flows.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
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4

García-Villalba, Navaridas Manuel. "Large eddy simulation of turbulent swirling jets." Karlsruhe : Univ.-Verl. Karlsruhe, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?idn=979664586.

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5

Ranga-Dinesh, K. K. J. "Large eddy simulation of turbulent swirling flames." Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/21086.

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Анотація:
Large eddy simulation (LES) is attractive as it provides a reasonable compromise between accuracy and cost, and is rapidly evolving as a practical approach for many engineering applications. This thesis is concerned with the application of large eddy simulation to unconfined swirl in turbulent non-premixed flames and isothermal flows. The LES methodology has been applied for the prediction of turbulent swirling reacting and non-reacting flows based on laboratory scale swirl burner known as the Sydney swirl burner, which has been a target flame of the workshop series of turbulent non-premixed flames (TNF). For that purpose a LES code was developed that can run wide range of applications. An algorithm was developed for LES of variable density reacting flow calculations. Particular attention was given to primitive conservation (mass, momentum and scalar) and kinetic energy of the flow and mixing field. The algorithm uses the primitive variables, which are staggered in both space and time. A steady laminar flamelet model which includes the detailed chemical kinetics and multi component mass diffusion, has been implemented in the LES code. An artificial inlet boundary condition method was implemented to generate instantaneous turbulent velocity fields that are imposed on the inflow boundary of the Cartesian grid. To improve the applicability of the code, various approaches were developed to improve stability and efficiency. LES calculations for isothermal turbulent swirling jets were successful in predicting experimentally measured mean velocities, their rms fluctuations and Reynolds shear stresses. The phenomenon of vortex breakdown (VB) and recirculation flow structures at different swirl and Reynolds numbers were successfully reproduced by the present large eddy simulations indicating that LES is capable of predicting VB phenomena which occurs only at certain conditions. For swirling flames, the LES predictions were able to capture the unsteady flow field, flame dynamics and showed good agreement with experimental measurements. The LES predictions for the mean temperature and major species were also successful.
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6

Vondál, Jiří. "Computational Modeling of Turbulent Swirling Diffusion Flames." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-234149.

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Schopnost predikovat tepelné toky do stěn v oblasti spalování, konstrukce pecí a procesního průmyslu je velmi důležitá pro návrh těchto zařízení. Je to často klíčový požadavek pro pevnostní výpočty. Cílem této práce je proto získat kvalitní naměřená data na experimentálním zařízení a využít je pro validaci standardně využívaných modelů počítačového modelování turbulentního vířivého difúzního spalování zemního plynu. Experimentální měření bylo provedeno na vodou chlazené spalovací komoře průmyslových parametrů. Byly provedeny měření se pro dva výkony hořáku – 745 kW a 1120 kW. Z měření byla vyhodnocena data a odvozeno nastavení okrajových podmínek pro počítačovou simulaci. Některé okrajové podmínky bylo nutné získat prostřednictvím dalšího měření, nebo separátní počítačové simulace tak jako například pro emisivitu, a nebo teplotu stěny. Práce zahrnuje několik vlastnoručně vytvořených počítačových programů pro zpracování dat. Velmi dobrých výsledků bylo dosaženo při predikci tepelných toků pro nižší výkon hořáku, kde odchylky od naměřených hodnot nepřesáhly 0.2 % pro celkové odvedené teplo a 16 % pro lokální tepelný tok stěnou komory. Vyšší tepelný výkon však přinesl snížení přesnosti těchto predikcí z důvodů chybně určené turbulence. Proto se v závěru práce zaměřuje na predikce vířivého proudění za vířičem a identifikuje několik problematických míst v použitých modelech využívaných i v komerčních aplikacích.
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7

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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8

Regunath, Gavita Shamuna. "Measurements and Investigation of Helicity in Turbulent Swirling Flow." Thesis, University of Sheffield, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489741.

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9

Chang, T. H. "An investigation of turbulent swirling flow with heat transfer." Thesis, Swansea University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636228.

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A detailed investigation of swirling flow in an axisymmetric pipe has been undertaken and the findings from both an experimental and analytical research programme have been reported in this thesis. The study was divided into two sections, firstly that concerning isothermal flow, before extending it to account for heat transfer resulting from swirling flow within a heated pipe. An experimental test-rig was manufactured to permit a detailed interrogation of all flow variables. The rig incorporated a specially designed swirl generator, fitted to the inlet of a perspex circular pipe, enabling varying intensities of swirl flow to be stimulated over a Reynolds number range of 20-60 x 103. An identical pipe, manufactured out of copper, enabled a constant heat flux to be applied at its outer surface, thereby permitting a corresponding investigation of the heat transfer phenomena. An analysis of the above flow regimes was undertaken through the solution of the equations of flow and the one-equation (k-1) model together with corresponding boundary conditions, for depicting isothermal turbulent flow with swirl. For the heat transfer analysis, a solution of the energy equation with its appropriate boundary conditions was included. The solution of the mathematical model was effected by using the finite element method and discretising in three dimensions over the domain. The effect of increasing the swirl intensity results in a migration of the locus of the points of maximum axial and tangential velocity towards the pipe wall. This is accompanied by higher heat transfer rates for a constant surface heat flux. The analysis has provided a viable technique for predicting turbulent flow with low swirl intensities, exhibiting good comparisons with the experimental results over much of the flow field. The main discrepancy occurred in the region of flow reversal, where the analysis is underpredictive, a consequence of the limitation of the one-equation model in accounting for momentum transport across the boundary of zero velocity.
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10

Croft, Thomas Nicholas. "Unstructured mesh : finite volume algorithms for swirling, turbulent, reacting flows." Thesis, University of Greenwich, 1998. http://gala.gre.ac.uk/6371/.

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The work presented in this thesis develops techniques, employing the Finite Volume discretisation method, which allow the numerical simulation of three dimensional heat transfer and fluid flow problems using unstructured meshes. The method solves and stores all variables at the element centres which lowers storage requirements and generally shortens run times compared with the Control Volume-Finite Element approach. Correction terms are formulated which address two of the main forms of errors caused by mesh skewness. To allow a generic handling of any unstructured mesh the Cartesian components of velocity are solved under all circumstances. This leads to the requirement to adjust the discretisation of the momentum equations when there is significant flow curvature. The changes are presented in this study both when the position of the flow axis is known prior to the simulation and when its position is known only as a result of the simulation, this being the case when there is more than one source of swirling flow. These original features contribute to a Computational Fluid Dynamics code which is capable of solving swirling, turbulent fluid flow and reactive, radiative heat transfer on highly complex geometries. Specifically the techniques are applied to the simulation of processes occurring in the direct smelting of iron. The use of the Finite Volume method makes it relatively easy to employ many techniques and physical models developed for structured codes. The evaluation of the face convective fluxes is effected through the Rhie - Chow interpolation method. The SIMPLE algorithm is used in the pressure - velocity coupling. In the simulation of swirling flows it is shown that both the standard and ReNormalisation Group k-e models fail to accurately predict turbulent effects. An anisotropic hybrid (k-e and mixing length) model is developed which produces excellent numerical results for the flows of interest. The Simple Chemical Reaction Scheme is used to evaluate the transport of the various chemical species. Radiation effects are simulated through the use of the radiosity model. A series of simulation results are presented which show the capabilities of the methods in test cases ranging from simple heat transfer problems through to the simulation of two swirling jets in a three dimensional unstructured mesh.
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Книги з теми "Turbulent swirling"

1

Saeed, Farokhi, and United States. National Aeronautics and Space Administration., eds. Turbulent swirling jets with exitation. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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2

Tsan-Hsing, Shih, and United States. National Aeronautics and Space Administration., eds. Modeling of turbulent swirling flows. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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3

G, Lilley D., and Lewis Research Center, eds. Confined turbulent swirling recirculating flow predictions. [Cleveland, Ohio?]: National Aeronautics and Space Administration, Lewis Research Center, 1985.

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4

Cusworth, R. A. Computation of turbulent free isothermal swirling jets. [Downsview, Ont.]: Institute for Aerospace Studies, 1987.

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5

Sislian, Jean Pascal. Measurements of mean velocity and turbulent intensities in a free isothermal swirling jet. [S.l.]: [s.n.], 1986.

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6

J, Rice Edward, Farokhi Saeed, and United States. National Aeronautics and Space Administration., eds. Large amplitude acoustic excitation of swirling turbulent jets. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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7

J, Rice Edward, Farokhi Saeed, and United States. National Aeronautics and Space Administration., eds. Large amplitude acoustic excitation of swirling turbulent jets. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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8

J, Rice Edward, Farokhi Saeed, and United States. National Aeronautics and Space Administration., eds. Controlled excitation of a cold turbulent swirling free jet. [Washington, DC]: National Aeronautics and Space Administration, 1987.

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9

Tangirala, Venkat E. Effect of swirl and heat release on flow fields in nonpremixed turbulent flames. Ann Arbor, Mich: University of Michigan, 1986.

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10

S, Lundgren Thomas, and United States. National Aeronautics and Space Administration., eds. Effect of swirl on turbulent structures in supersonic jets: Final report, NCC2-5221. [Washington, DC: National Aeronautics and Space Administration, 1998.

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Частини книг з теми "Turbulent swirling"

1

Pinton, J. F., P. Odier, and S. Fauve. "Magnetohydrodynamics in turbulent swirling flow." In Fundamental Problematic Issues in Turbulence, 467–70. Basel: Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-8689-5_46.

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2

Ashgriz, Nasser, Siyu Chen, Viktor Nikulin, and Serguei Savtchenko. "Turbulent Suppression in Swirling Sprays." In Modeling and Simulation of Turbulent Mixing and Reaction, 251–63. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2643-5_11.

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3

Poncet, S., R. Schiestel, and R. Monchaux. "Turbulent Von Kármán Swirling Flows." In Springer Proceedings Physics, 547–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-72604-3_174.

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4

Mao, Xuerui, and Spencer J. Sherwin. "Spectra of Swirling Flow." In Seventh IUTAM Symposium on Laminar-Turbulent Transition, 247–52. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3723-7_39.

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5

Menon, Suresh, Vaidyanathan Sankaran, and Christopher Stone. "Combustion Dynamics of Swirling Turbulent Flames." In Computational Science — ICCS 2001, 1127–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45545-0_124.

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6

Shtern, V. "Asymptotic Study of Turbulent Swirling Jets." In Fluid Mechanics and Its Applications, 187–200. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1728-6_16.

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7

Odier, P., J. F. Pinton, and S. Fauve. "Magnetohydrodynamics in a Turbulent Swirling Flow." In Fluid Mechanics and Its Applications, 407–10. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5118-4_100.

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8

Szasz, Robert Zoltan, Laszlo Fuchs, and Doru Adrian Caraeni. "Study of Mixing in Swirling Turbulent Jets." In IUTAM Symposium on Turbulent Mixing and Combustion, 221–33. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-1998-8_18.

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9

Ettestad, David, and John L. Lumley. "Parameterization of Turbulent Transport in Swirling Flows — I: Theoretical Considerations." In Turbulent Shear Flows 4, 87–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-69996-2_7.

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10

Obligado, Martin, Romain Volk, Nicolas Mordant, and Mickael Bourgoin. "Preferential Concentration of Finite Solid Particles in a Swirling von Kármán Flow of Water." In Turbulent Cascades II, 207–16. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12547-9_22.

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Тези доповідей конференцій з теми "Turbulent swirling"

1

Lilley, David. "Turbulent swirling reacting flow." In 32nd Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-113.

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2

Holmes, Marlin, Eric J. DeMillard, and Jonathan W. Naughton. "Turbulence Structure of the Swirling Axisymmetric Turbulent Wake." In 35th Wind Energy Symposium. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-0919.

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3

Dong, Mingchun, and David Lilley. "Prediction of turbulent swirling reacting flows." In 33rd Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-285.

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4

Hind, Michael, and Jonathan W. Naughton. "Experimental Investigation of Turbulent Swirling Wakes." In 52nd Aerospace Sciences Meeting. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-0958.

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5

Khalil, Essam. "Turbulent Swirling Furnace Flows: History and Development." In 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-442.

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6

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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7

CHEN, C. "Particle dispersion in confined turbulent swirling flows." In 22nd Joint Propulsion Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/6.1986-1450.

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8

Craft, Tim J., Brian E. Launder, Athanasios Zacharos, and Hector Iacovides. "SOME SWIRLING-FLOW CHALLENGES FOR TURBULENT CFD." In Proceedings of CHT-08 ICHMT International Symposium on Advances in Computational Heat Transfer. Connecticut: Begellhouse, 2008. http://dx.doi.org/10.1615/ichmt.2008.cht.20.

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9

Kozorezov, Yu S., S. I. Shtork, Sergei V. Alekseenko, V. M. Dulin, and D. M. Markovich. "Flow structure of swirling turbulent propane flames." In Turbulence, Heat and Mass Transfer 6. Proceedings of the Sixth International Symposium On Turbulence, Heat and Mass Transfer. Connecticut: Begellhouse, 2009. http://dx.doi.org/10.1615/ichmt.2009.turbulheatmasstransf.1770.

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10

Kapoor, Abhinav, Ashoke De, and Rakesh Yadav. "Multi Eulerian PDF Transport Modelling of Turbulent Swirling Flame." In ASME 2012 Gas Turbine India Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gtindia2012-9543.

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Анотація:
The paper presents numerical investigation using Multi environmental Eulerian PDF (MEPDF) transport model for turbulence-chemistry interaction. A turbulent flame (SM1) from Sydney swirling burner database is simulated along with two isothermal cases (N29S054, N16S159) of different swirl numbers. MEPDF methodology, a probability density function (PDF) transport modeling, exploits the advantages of the PDF transport equation and is also computationally less expensive compared to popularly used Lagrangian solution approach of PDF transport equation. In the MEPDF approach, the PDF transport equation is represented by direct quadrature method of moments with presumed shape PDF and the closure of micro-mixing is achieved by interaction by exchange with mean (IEM) model. In the current work, the reacting flow results using MEPDF are reported for SM1 flame, which is a part of the database of turbulent reacting flows and widely considered as benchmark test cases for validating turbulent-chemistry interaction models. Initially, the non-reacting flows are simulated to properly choose the boundary conditions, turbulence models as well as the grid; followed by reacting flow calculations. SKE and RKE predictions show good agreement with each other while the other turbulence model exhibit substantially different behavior, especially for non-reacting case. However, RKE model exhibits substantial improvement in the case of reacting flows.
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Звіти організацій з теми "Turbulent swirling"

1

Cloutman, L. Analytic solutions for the decay of turbulent swirling flow in a cylinder. Office of Scientific and Technical Information (OSTI), December 1989. http://dx.doi.org/10.2172/5110095.

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2

Gessner, Frederick B. Turbulence Structure of Mixing Swirling Flows. Fort Belvoir, VA: Defense Technical Information Center, December 1987. http://dx.doi.org/10.21236/ada193063.

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3

Gessner, Fredrick B. Turbulence Structure of Mixing Swirling Flows. Fort Belvoir, VA: Defense Technical Information Center, December 1989. http://dx.doi.org/10.21236/ada216628.

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4

Naughton, J., D. Stanescu, S. Heinz, R. Semaan, M. Stoellinger, and C. Zemtsop. Integrated Computational/Experimental Study of Turbulence Modification and Mixing Enhancement in Swirling Jets. Fort Belvoir, VA: Defense Technical Information Center, January 2009. http://dx.doi.org/10.21236/ada495159.

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