Tesi sul tema "Swirling"
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Stokes, Jason R. "Swirling flow of viscoelastic fluids /". Connect to thesis, 1998. http://eprints.unimelb.edu.au/archive/00000686.
Testo completoFerguson, John William James. "Swirling flows in conical vessels". Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329778.
Testo completoDavidson, P. A. "Magnetohydrodynamics of swirling, recirculating flow". Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383052.
Testo completoJones, Lee Nicholas. "Modelling of turbulent swirling flows". Thesis, University of Leeds, 2004. http://etheses.whiterose.ac.uk/1192/.
Testo completoLucca-Negro, Oona. "Modelling of swirling flow instabilities". Thesis, Cardiff University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310677.
Testo completoHeaton, Christopher James. "Acoustics and stability in swirling flow". Thesis, University of Cambridge, 2006. https://www.repository.cam.ac.uk/handle/1810/272161.
Testo completoQuaranta, Hugo. "Instabilities in a swirling rotor wake". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0052.
Testo completoThis work studies the instabilities associated with the wake of a rotor. These devices are used in many applications such as energy harvesting or propulsion,and their optimisation is crucial for both industry and the environment. The wakebehind a rotor is broadly defined as a system of interlaced helical vortices, whose dynamics governs the transition from the near-wake to the far-wake regime. In our first study, we investigate the wake behind different small-scale rotors in their design operating condition. We use the resulting flows in a subsequent linear stability analysis, aiming at predicting long-wavelength instability modes in the helical vortex. We find that the theoretical prediction of the modes growth-rates matches our experimental measurements. We also show that the dynamics of helical vortex filaments can be predicted from simple two-dimensional theory. In more critical flow configurations, instabilities are suspected to promote the transition to hazardous regimes such as the so called Vortex-Ring State, characterised by large-scale recirculating structures.The second part of this work is thus dedicated to the spatio-temporal evolution of localised perturbations in the rotor plane, and their potential tendency to propagate upstream in the flow
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.
Testo completoTarr, Stephen John. "The mathematical modelling multiple swirling burner flows". Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243506.
Testo completoVondál, 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.
Testo completoZhang, Huangwei. "Extinction in turbulent swirling non-premixed flames". Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/254974.
Testo completoHatziapostolou, Antonis. "Swirling flows in direct-injection diesel engines". Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/8661.
Testo completoRiahi, Ardeshir. "Turbulent swirling flow in short cylindrical chambers". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30810.
Testo completoApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Ranga-Dinesh, K. K. J. "Large eddy simulation of turbulent swirling flames". Thesis, Loughborough University, 2007. https://dspace.lboro.ac.uk/2134/21086.
Testo completoNygaard, Thor Isak. "Two phase swirling flow in a cylindrical reactor". Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/10192.
Testo completoIJzermans, Rutgerus Henricus Anthonius. "Dynamics of dispersed heavy particles in swirling flow". Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/57886.
Testo completoShort, David James. "Swirling flow induced by a rotating magnetic field". Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338644.
Testo completoDunham, David. "Unsteady fluid mechanics of annular swirling shear layers". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8483.
Testo completoValenciano, Rubio Jose L. "Adaptive spectral element methods for swirling Newtonian flows". Thesis, Edinburgh Napier University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285227.
Testo completoAhmadi, Abolfazl. "The swirling orifice plate independent of inlet conditions". Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427248.
Testo completoMüller, Sebastian. "Numerical investigations of compressible turbulent swirling jet flows". kostenfrei, 2007. http://e-collection.ethbib.ethz.ch/view/eth:30052.
Testo completoWilley, Donald. "Application of small swirling jets in fluidised beds". Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/15259/.
Testo completoZhang, Qingguo. "Lean blowoff characteristics of swirling H2/CO/CH4 Flames". Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22641.
Testo completoStone, Christopher. "Large-Eddy simulation of combustion dynamics in swirling flows". Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/13430.
Testo completoRegunath, 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.
Testo completoChang, 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.
Testo completoFeyedelem, Michael S. "Interaction of a swirling jet with a free surface". Thesis, Monterey, California. Naval Postgraduate School, 1996. http://hdl.handle.net/10945/8548.
Testo completoThe turbulent flow field of a swirling jet issuing from a nozzle, beneath and parallel to a free surface has been studied in as much detail as possible using a three-component laser Doppler velocimeter and flow visualization. The results have shown that the swirl leads to the faster spreading and quicker mixing of the jet. For strongly swirling jets (S = 0.522), the similarity is not reached within ten diameters downstream. The results have also shown that both the acial and tangential velocity components decrease outward from the jet axis, naturall leading to centrifugal instabilities. This, in turn, leads to the creation of large scale coherent structures at the periphery of the jet, particularly when it is in the vicinity of the free surface. The turbulent shear stresses exhibit anisotropic behavior, the largest always being in the plane passing through the jet axis. The change of TKE with S is not monotonic. It is maximum for S - 0.265, smallest for S = 0.50, and has an intermediate value for S - 0.522. This is due to the occurrence of vortex breakdown and the resulting intensification of the turbulence within the jet prior to its exit from the nozzle.
Tonkin, Ruth Julie Jane. "Swirling pipeflow of non-Newtonian and particle-laden fluids". Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/11673/.
Testo completoGatti, Marco. "Combustion dynamics of premixed swirling flames with different injectors". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC070/document.
Testo completoLean premixed (LPM) combustion systems achieve low pollutant emission levels, with compact flames and high power densities, but are highly sensitive to dynamic phenomena, e.g, flashback, blowout and thermoacoustic instabilities, that hinder their practical application. Most LPM gas turbine combustors use swirling flows to stabilize compact flames for efficient and clean combustion. A better knowledge of the mechanisms of steady and unsteady combustion of lean premixed swirled mixtures is then of practical, as well as fundamental interest. This thesis is a contribute towards the achievement of this goal. A burner, made of several components with variable geometry, was specifically designed for this scope. An experimental analysis was conducted to investigate the main parameters leading to a reduction of the sensitivity of LPM systems to dynamic phenomena. The diagnostics applied include flame transfer function (FTF) measurements, laser diagnostics (LDV and PIV) and flame imaging. Large eddy simulations were also exploited to elucidate the mechanisms behind the experimental observations
Carrara, Mark David. "Hydrodynamic Stability of Periodically Unsteady Axisymmetric and Swirling Jets". Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/10139.
Testo completoMaster of Science
Baej, Hesham. "Effects of geometry and gas composition on swirling flow". Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/86536/.
Testo completoQadri, Ubaid Ali. "Global stability and control of swirling jets and flames". Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245143.
Testo completoLewis, Jonathan. "The behaviour of swirling flames under variable fuel composition". Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/66162/.
Testo completoWANG, DEXIN. "STRONGLY SWIRLING FLOW STUDY ON PRESSURE-SWIRL ATOMIZER AND CYCLONE COMBUSTOR". University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1032210020.
Testo completoYazdabadi, Paul Adi. "A study of the precessing vortex core in cyclone dust separators and a method of prevention". Thesis, Cardiff University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297246.
Testo completoÖrlü, Ramis. "Experimental study of passive scalar mixing in swirling jet flows". Licentiate thesis, KTH, Mechanics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4142.
Testo completoDespite its importance in various industrial applications there is still a lack of experimental studies on the dynamic and thermal field of swirling jets in the near-field region. The present study is an attempt to close this lack and provide new insights on the effect of rotation on the turbulent mixing of a passive scalar, on turbulence (joint) statistics as well as the turbulence structure.
Swirl is known to increase the spreading of free turbulent jets and hence to entrain more ambient fluid. Contrary to previous experiments, which leave traces of the swirl generating method especially in the near-field, the swirl was imparted by discharging a slightly heated air flow from an axially rotating and thermally insulated pipe (6 m long, diameter 60 mm). This gives well-defined axisymmetric streamwise and azimuthal velocity distributions as well as a well-defined temperature profile at the jet outlet. The experiments were performed at a Reynolds number of 24000 and a swirl number (ratio between the angular velocity of the pipe wall and the bulk velocity in the pipe) of 0.5.
By means of a specially designed combined X-wire and cold-wire probe it was possible to simultaneously acquire the instantaneous axial and azimuthal velocity components as well as the temperature and compensate the former against temperature variations. The comparison of the swirling and non-swirling cases clearly indicates a modification of the turbulence structure to that effect that the swirling jet spreads and mixes faster than its non-swirling counterpart. It is also shown that the streamwise velocity and temperature fluctuations are highly correlated and that the addition of swirl drastically increases the streamwise passive scalar flux in the near field.
Facciolo, Luca. "A study on axially rotating pipe and swirling jet flows". Doctoral thesis, Stockholm : Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3862.
Testo completoÖrlü, Ramis. "Experimental study of passive scalar mixing in swirling jet flows /". Stockholm : KTH Mechanics, Royal Institute of technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4142.
Testo completoYehia, Mohamed Ahmed Aly. "Modelling of pulverised coal swirling flames in axi-symmetric furnaces". Thesis, Imperial College London, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245761.
Testo completoFu, Song. "Computational modelling of turbulent swirling flows with second-moment closures". Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267917.
Testo completoMobed, Darius Darayes. "Experimental aero-acoustic assessment of swirling flows for drag applications". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38650.
Testo completoIncludes bibliographical references (p. 131-133).
The need for quiet drag technologies stems from stricter requirements for and growing demand of low-noise aircraft. The research presented in this thesis regards the use of swirling exhaust flows capable of generating pressure drag quietly by establishing a steady streamwise vortex. The simple concept of a so called swirl tube, a ducted set of stationary turning vanes, was implemented to experimentally assess the aerodynamic and aero-acoustic behavior of swirling flows. A modular design was chosen for the model-scale wind-tunnel test article based on a full-scale diameter of 1.2 m to allow for the wind-tunnel testing of different swirl angles, including both stable swirling configurations and cases exhibiting vortex breakdown. Analyses of both aerodynamic and aero-acoustic test results indicate that highly swirling stable flows obtain maximum drag coefficients greater than 0.8 +0.04 referenced to inlet area with full-scale overall sound pressure level (OASPL) of 42 dBA ±2 dBA, validating the working hypothesis that swirling flows can generate drag quietly. An advanced deconvolution approach for the mapping of acoustic sources (DAMAS), previously developed at the NASA Langley Research Center, was used to identify and to quantify quadrupole- and turbulent scattering-type noise sources in stable swirling flow cases, radiating from the downstream exhaust core and nacelle trailing edge regions, respectively.
(cont.) Cases exhibiting vortex breakdown, found to occur at swirl angle settings exceeding -50', demonstrated noise signatures 10 to 15 dB louder than the stable swirling flows, attributable to the increased scattering noise due to the turbulence of the burst vortex near swirl tube rear surfaces and edges. The practical integration of swirl tubes into aircraft design was assessed based on the conceptual silent aircraft design SAX-40. Integrating swirl vanes into the fan bypass or mixing ducts of aircraft engines is suggested to be capable of generating effective drag at minimal weight cost, benefiting from increased mass flow through the device due to fan pumping. The effects of non-uniform inlet flows on the generation of drag and noise were assessed experimentally and showed a reduction in drag by less than 17% with virtually no noise penalty. The experimental assessment of the swirl tube combined with theoretical engine and airframe integration studies suggest that swirling exhaust flows are capable of generating drag for quiet transport aircraft.
by Darius Darayes Mobed.
S.M.
Kharraz, Adel Omar. "Stability of Swirling Flow in Passive Cyclonic Separator in Microgravity". Case Western Reserve University School of Graduate Studies / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case150257066154572.
Testo completoGhulam, Mohamad. "Characterization of Swirling Flow in a Gas Turbine Fuel Injector". University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563877023803877.
Testo completoCroft, Thomas Nicholas. "Unstructured mesh : finite volume algorithms for swirling, turbulent, reacting flows". Thesis, University of Greenwich, 1998. http://gala.gre.ac.uk/6371/.
Testo completoWang, Xionghui. "Experimental Investigation of Self-Excited Instabilities in Liquid-Fueled Swirl Combustion". University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1516361245616083.
Testo completoCazan, Radu. "Dynamics of swirling flows induced by twisted tapes in circular pipes". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33944.
Testo completoGarcía-Villalba, Navaridas Manuel [Verfasser]. "Large eddy simulation of turbulent swirling jets / Manuel García-Villalba Navaridas". Karlsruhe : Univ.-Verl. Karlsruhe, 2006. http://d-nb.info/979664586/34.
Testo completoQuaranta, Erika. "Noise radiation from a ducted rotor in a swirling-translating flow". Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/4577.
Testo completoTerdalkar, Rahul J. "Direct numerical simulation of swirling flows using the front tracking method". Worcester, Mass. : Worcester Polytechnic Institute, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-122007-233351/.
Testo completoKong, L. "Finite element analysis to confined turbulent swirling flow with heat transfer". Thesis, Swansea University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637821.
Testo completo