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Tesi sul tema "Jets"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Pietroniro, Asuka Gabriele. "Modelling coaxial jets relevant to turbofan jet engines." Thesis, KTH, Mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200909.

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Simulations of subsonic turbulent coaxial hot jets were conducted on two types ofunstructured grids within the framework of STAR-CCM+. The study case is based on atypical airliner turbofan engine model with a core nozzle and a fan nozzle, having a bypassratio of five. The two meshes used are a polyhedral one, suitable for complex surfaces, and atrimmed one mainly made of hexahedral cells. The sensitivity of the study case to variousinputs is attested using second and third order upwind schemes, modelling turbulence with aSST k-omega model. The project proves to be a valid feasibility study for

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2

Pietroniro, Asuka Gabrielle. "Modelling coaxial jets relevat to turbofan jet engines." Thesis, KTH, Mekanik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204020.

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Abstract (sommario):

Simulations of subsonic turbulent coaxial hot jets were conducted on two types ofunstructured grids within the framework of STAR-CCM+. The study case is based on atypical airliner turbofan engine model with a core nozzle and a fan nozzle, having a bypassratio of five. The two meshes used are a polyhedral one, suitable for complex surfaces, and atrimmed one mainly made of hexahedral cells. The sensitivity of the study case to variousinputs is attested using second and third order upwind schemes, modelling turbulence with aSST k-omega model. The project proves to be a valid feasibility study for

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3

Smith, Barton Lee. "Synthetic jets and their interaction with adjacent jets." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18889.

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4

Manfroi, Aldo J. "Zonal jets /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2001. http://wwwlib.umi.com/cr/ucsd/fullcit?p3035898.

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5

Moutoussi, Ann. "Quark and gluon jets in a three-jet environment." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297244.

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6

Ghahremanian, Shahriar. "Near-Field Study of Multiple Interacting Jets : Confluent Jets." Doctoral thesis, Linköpings universitet, Energisystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-113259.

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This thesis deals with the near-field of confluent jets, which can be of interest in many engineering applications such as design of a ventilation supply device. The physical effect of interaction between multiple closely spaced jets is studied using experimental and numerical methods. The primary aim of this study is to explore a better understanding of flow and turbulence behavior of multiple interacting jets. The main goal is to gain an insight into the confluence of jets occurring in the near-field of multiple interacting jets. The array of multiple interacting jets is studied when they ar

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7

Stan, Gheorghe. "Fundamental Characteristics of Turbulent Opposed Impinging Jets." Thesis, University of Waterloo, 2000. http://hdl.handle.net/10012/831.

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A fundamental study of two turbulent directly opposed impinging jets in a stagnant ambient fluid, unconfined or uninfluenced by walls is presented. By experimental investigation and numerical modeling, the main characteristics of direct impingement of two turbulent axisymmetric round jets under seven different geometrical and flow rate configurations (L*= L/d = { 5, 10, 20 }, where L is nozzle to nozzle separation distance and d is nozzle diameter, and Re = { 1500, 4500, 7500, 11000 }) are discussed. Flow visualization and velocity measurements performed using various laser based technique

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8

Mutter, Troy Blake. "Numerical simulations of elliptical jets : a study of jet entrainment /." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07102009-040630/.

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9

Chakravorty, Saugata. "A Numerical Study On Absolute Instability Of Low Density Jets." Thesis, Indian Institute of Science, 2000. https://etd.iisc.ac.in/handle/2005/227.

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A spectacular instability has been observed in low density round jets when the density ratio of jet fluid to ambient fluid falls below a threshold of approximately 0.6. This phenomenon has been observed in non-buoyant jets of helium in air, heated air jets and heated buoyant jets. The oscillation of the flow near the nozzle is extremely regular and periodic and consists of ring vortices. Even the smaller scale structures that appear downstream exhibit similar regularity. A theory for predicting the onset of this oscillation is based on finding regions of absolute instability from linear stabil

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10

Chakravorty, Saugata. "A Numerical Study On Absolute Instability Of Low Density Jets." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/227.

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Abstract (sommario):

A spectacular instability has been observed in low density round jets when the density ratio of jet fluid to ambient fluid falls below a threshold of approximately 0.6. This phenomenon has been observed in non-buoyant jets of helium in air, heated air jets and heated buoyant jets. The oscillation of the flow near the nozzle is extremely regular and periodic and consists of ring vortices. Even the smaller scale structures that appear downstream exhibit similar regularity. A theory for predicting the onset of this oscillation is based on finding regions of absolute instability from linear stabil

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11

Kogan, Lucy Anne. "The jet energy scale uncertainty derived from gamma-jet events for small and large radius jets and the calibration and performance of variable R jets with the ATLAS detector." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:b70b8c23-ffce-4d7a-b3d0-2cc5c9fd1d69.

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In this thesis the jet energy scale uncertainty of small and large radius jets at the ATLAS detector is evaluated in-situ using gamma-jet events. The well calibrated photon in the gamma-jet events is used to probe the energy scale of the jets. The studies of the jet energy scale of small radius jets are performed using 4.7 fb<sup>-1</sup> of data collected at sqrt{s} = 7 TeV in 2011. The gamma-jet methods which were developed are then adapted and applied to large radius jets, using 20.3 fb^-1 of data collected at sqrt{s} = 8 TeV in 2012. The new jet energy scale uncertainties are found to be ~

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12

Lin, Kuanchung J. "Modeling viscoelastic jets /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487594970651388.

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13

Wannassi, Manel. "Etude des transferts thermiques par batteries de jets pour la trempe du verre." Thesis, Valenciennes, 2013. http://www.theses.fr/2013VALE0022/document.

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La trempe à l’air est largement utilisée dans les procédés de production de verre de sécurité. L’obtention d’une distribution de contraintes adéquate requiert un refroidissement intense et homogène à la fois, et ces deux propriétés sont difficiles à obtenir sur la courte durée de la trempe. Les batteries de jets utilisées dans la plupart des systèmes de trempe produisent un refroidissement adéquat mais souffrent d’inhomogénéité, à l’origine de défauts de trempe et de casse durant le processus.L’objectif de cette thèse est d’explorer des nouvelles configurations qui améliorent l’homogénéité du

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14

Fletcher, Gregory. "A Measurement of W+jets Z+jets with the ATLAS Detector." Thesis, Queen Mary, University of London, 2015. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8047.

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A study is presented on the production of vector boson (W and Z0) events in association with recoiling hadronic activity in the form of hadronic jets, using proton-proton collisions at the LHC. The dataset was taken by the ATLAS detector during the 2011 data-taking run, at a centre of mass energy p s = 7 TeV, and corresponds to an integrated luminosity of 4.6 fb 1. A measurement of the cross-section ratio of W+jets Z+jets events is de ned, reducing the large systematic uncertainties inherent in the experimental measurement of such events. Inclusive and di erential cross-sections are presented

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15

Gao, Nan Ewing Daniel. "Offset attaching planar jets with and without a co-flowing jet." *McMaster only, 2006.

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16

Fendt, Christian. "Formation of astrophysical jets." Thesis, [S.l. : s.n.], 2002. http://pub.ub.uni-potsdam.de/2003/0014/door.htm.

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17

Zahniser, Russell 1982. "Instabilities of rotating jets." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32752.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.<br>Includes bibliographical references (p. 33-34).<br>When a jet of water is in free fall, it rapidly breaks up into drops, since a cylinder of water is unstable. This and other problems involving the form of a volume of water bound by surface tension have yielded a wealth of theoretical and experimental results, and given insight into such phenomena as the shape of the Earth. Particularly interesting behaviors tend to emerge when the fluid in question is rotating; a drop may, for example, form a toroidal or ellipsoi

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18

Wadhwa, Navish. "Non-coalescence of Jets." Thesis, Virginia Tech, 2012. http://hdl.handle.net/10919/42636.

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Abstract (sommario):

Contrary to common intuition, free jets of fluid can ``bounce'' off each other on collision in mid-air, through the effect of a lubricating air film that separates the jets. While there has been much work on coalescing jets of fluid and non-coalescence in other systems like drop-drop, drop on a bath, jet on a bath, non-coalescence of fluid jets has been little studied. A simple experimental setup was developed to stably demonstrate and study the non-coalescence of jets upon collision. This thesis presents the results of an experimental investigation of oblique collision between two fluid jets.

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19

Ben-Yeoshua, Moshe 1957. "Coaxial jets with swirl." Thesis, The University of Arizona, 1993. http://hdl.handle.net/10150/291734.

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The near field of coaxial air jets, with swirl in the outer one, was investigated experimentally. Axial and azimuthal velocities were mapped using hot-wire anemometry, and static pressure measurements were obtained using a pitot tube. The flow was visualized using a double-pass schlieren system. The flow is sensitive to both the amount of swirl, characterized by the swirl number S, and the mass flow ratio between the outer and inner jets, mr. A necessary condition for recirculation to occur was that S > 0.58 and mr > 8.5. The magnitude of a pressure deficit in the centerline strongly depends o

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20

Norenius, Linus. "Geoeffectiveness of Magnetosheath Jets." Thesis, Umeå universitet, Institutionen för fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-164846.

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In this report we present spacecraft and ground-based observations of magnetosheath jets impacting the magnetosphere, both as a case study and a statistical study. In the case study, jets were detected in the magnetosheath by the Magnetospheric MultiScale mission, MMS. By utilizing a data-based magnetosphericmodel (Tsyganenko T96 [29]), we estimated which jets were likely to impact the magnetopause and where they would do so. We examined ground based magnetometers, GMAGs, at the expected foot-point to the affected magnetic fieldline and compared this with the spacecraft observations. Theoretic

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21

Goparaju, Kalyan. "Flow and Acoustic Characteristics of Complex Supersonic Jets." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1510933315034965.

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22

Algwari, Q. Th. "Plasma jet formation and interactions between atmospheric pressure dielectric barrier discharge jets." Thesis, Queen's University Belfast, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.545999.

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23

Koeksal, Ayda. "Determination of differences between quark and gluon jets in 3-jet events." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388708.

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24

Ma, Frank Teng. "Detailed characterization of jets in heavy ion collisions using jet fragmentation functions." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/83823.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 159-163).<br>In this thesis the jet fragmentation function of inclusive jets with transverse momentum PT > 100 GeV/c in PbPb collisions is measured for reconstructed charged particles with PT > 1 GeV/c within the jet cone. A data sample of PbPb collisions collected in 2011 at a center-of-mass energy of [square root of]sNN = 2.76 TeV corresponding to an integrated luminosity of 150 [mu]b-1 is used. The results for PbPb collisions

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25

Sauvan, Jean-Baptiste. "Z+jets au LHC : calibration des jets et mesure de sections efficaces avec le détecteur ATLAS." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00747024.

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La recherche du boson de Higgs ainsi que celle de nouvelle physique auprès du LHC requiert une excellente compréhension des processus du Modèle Standard du fait de leurs signatures expérimentales similaires. La capacité de mesurer le plus précisément possible l'énergie des objets reconstruits dans les détecteurs est par ailleurs primordiale à la fois pour effectuer des mesures de précision et pour accroître la sensibilité des analyses à des signaux de physique au-delà du Modèle Standard. Les travaux présentés dans cette thèse s'attachent à ces deux points par l'étude d'événements contenant un

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26

Rajakuperan, E. "Experimental And Computational Investigations Of Underexpanded Jets From Elliptical Sonic Nozzles." Thesis, Indian Institute of Science, 1994. https://etd.iisc.ac.in/handle/2005/158.

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Abstract (sommario):

Three dimensional nozzles and jet flows have attracted the attention of many researchers due to their potential application to many practical devices. Rectangular nozzles are considered for short/vertical take off and landing aircrafts for achieving powered lift. Axisymmetric nozzles with lobes, tabs or slots and elliptical nozzles are considered for noise reduction in aircrafts and mixing augmentation in airbreathing rockets. Interaction of supersonic jets with solid surface, as in the case of retro and ullage rockets in launch vehicles and interaction of multiple jets as in the case of lau

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27

Rajakuperan, E. "Experimental And Computational Investigations Of Underexpanded Jets From Elliptical Sonic Nozzles." Thesis, Indian Institute of Science, 1994. http://hdl.handle.net/2005/158.

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Abstract (sommario):

Three dimensional nozzles and jet flows have attracted the attention of many researchers due to their potential application to many practical devices. Rectangular nozzles are considered for short/vertical take off and landing aircrafts for achieving powered lift. Axisymmetric nozzles with lobes, tabs or slots and elliptical nozzles are considered for noise reduction in aircrafts and mixing augmentation in airbreathing rockets. Interaction of supersonic jets with solid surface, as in the case of retro and ullage rockets in launch vehicles and interaction of multiple jets as in the case of laun

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28

Dubois, Julien. "Etude expérimentale de jets libres, compressibles ou en présence d'un obstacle." Thesis, Aix-Marseille 2, 2010. http://www.theses.fr/2010AIX22010/document.

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L’objectif de ces travaux est d’étudier expérimentalement la dispersion d’hydrogène pour évaluer l’impact des fuites chroniques ou accidentelles qui peuvent intervenir en milieu libre ou encombré, à faible ou à forte pression, sur un véhicule fonctionnant avec une pile à combustible. Les fuites étudiées sont assimilées à des jets verticaux, turbulents, axisymétriques, à densité variable, et issus d’orifices cylindriques de 1 à 3 mm de diamètre. Un banc expérimental a été conçu pour étudier ces fuites : l’hydrogène a été remplacé par de l’hélium pour des raisons de sécurité. Il résiste à une pr

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29

Forti, Nicola. "Study of jets produced at LHC and measurements of their substructures." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24278/.

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I jets sono prodotti dalla pioggia di adronizzazione di partoni prodotti negli hard scattering ad alta energia e sono osservabili fondamentali per comprendere i processi fisici nei collisori ad alta energia. Negli ultimi anni lo studio della loro struttura interna è diventato un tema scottante. Considerando il grande centro di energia di massa a LHC, molte particelle che decadono possono produrre partoni quasi collineari. La comprensione della struttura interna dei jets ci permette di comprendere le interazioni e le dinamiche che portano alla produzione, in particolare, di large-R jets. In que

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30

Biolchini, Romain. "Etudes des effets de température sur le bruit de jet subsonique par simulation des grandes échelles." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC064.

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Ces travaux de recherche sont consacrés à l’étude des effets de température sur le développement aérodynamique et l’acoustique rayonnée d’un jet subsonique par simulation des grandes échelles. Ces simulations sont réalisées avec un solveur 3D résolvant les équations de Navier-Stokes compressibles par une approche Volumes Finis. De plus, des schémas de discrétisation spatiale et d’intégration temporelle peu dissipatifs et peu dispersifs sont utilisés pour permettre l’étude des phénomènes acoustiques. La propagation acoustique est réalisée grâce à l’analogie acoustique de Ffowcs-Williams et Hawk

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31

Cutler, Philip Robert Edward. "On the structure and mixing of a jet in crossflow : Ph.D. thesis." Title page, abstract and table of contents only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phc9895.pdf.

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32

Caron, Sascha. "Jets in photoproduction at HERA." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=96548209X.

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33

Lai, Chung-kei Chris. "Mixing of inclined dense jets." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B4423661X.

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34

Stuland, Eirik Martin. "Computation of impinging gas jets." Thesis, Norwegian University of Science and Technology, Department of Energy and Process Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9716.

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<p>Abstract This dissertation has been produced during the spring semester of 2008 to serve to the requirements for the degree of Master of Technology at the Norwegian University of Science and Technology (NTNU). The thesis has been written at the department of Energy and Process Engineering, with supervision of Professor Helge I. Andersson from the Fluid Dynamics department. The thesis has the title Computation of Impinging Gas Jets, and aims to investigate the Impinging Jet Flow (IJF) problem presented in section[2] by means of Computational Fluid Dynamics (CFD). For the work of this

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35

Lekholm, Ville. "Schlieren imaging of microrocket jets." Thesis, Uppsala University, Ångström Space Technology Centre, ÅSTC, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-127219.

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<p>In this report, microrockets from the company NanoSpace were studied using schlieren imaging techniques. The rocket chips are manufactured using MEMS technology, which requires compromises regarding the shape of the nozzle. The rocket chips are 22x22x0.85 mm, manufactured from laminated silicon. The nozzles are approximately 20 µm wide at the throat, and 350 µm wide at the exit. A semi in-line schlieren apparatus was designed, set up, and aligned. A small vacuum chamber was constructed, and a series of tests was conducted in order to qualitatively evaluate the consequences of these compromi

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36

Mazurek, Kerry Anne. "Scour of clay by jets." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ60324.pdf.

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37

Zou, Yue. "Air jets in ventilation applications." Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3146.

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38

Brinkert, Jacob. "Particle jets in fluidised beds." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319390.

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39

Kurosoy, Ersel. "Opposed jets, flames and extinction." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402177.

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40

Outten, Stephen. "Easterly Tip Jets Around Greenland." Thesis, University of East Anglia, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.514267.

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41

Hardcastle, M. J. "The jets in radio galaxies." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603680.

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I present high-resolution, high-sensitivity images of four FRI radio galaxies and seventeen FRII radio galaxies, made with the aim of detecting and imaging jets and counterjets. For the FRIs, I show images of the detailed total intensity and polarisation structure in the jets and counterjets and in the sources as a whole. I argue that models in which the jets are initially relativistic but decelerate are a good fit to the overall behaviour of the objects, but that some recent models of the polarisation structure are ruled out by the observations. The radio-optical spectrum of the jet in one ob

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42

Lai, Chung-kei Chris, and 黎頌基. "Mixing of inclined dense jets." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B4423661X.

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43

Baker, Laura. "Sting jets in extratropical cyclones." Thesis, University of Reading, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.541952.

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44

Ho, Y. K. "Supersonic and subsonic radial jets." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378306.

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45

Cox, Christopher Ian. "Numerical simulations of astrophysical jets." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335736.

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46

Kuo, Chih-yu. "The acoustics of impinging jets." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624916.

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47

Bence, Stephen John. "Stellar jets and molecular outflows." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627089.

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48

Liamini, Mokhtar. "Étude des jets supersoniques impactants." Mémoire, Université de Sherbrooke, 2005. http://savoirs.usherbrooke.ca/handle/11143/1289.

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Un large éventail d'applications industrielles fait appel aux jets supersoniques impactants. Notamment leur utilisation pour la manutention sans contact des objets de faible masse. Il s'avère donc nécessaire de pouvoir prédire les profils de pression et de température que crée un jet supersonique sous-détendu sur l'objet impacté ainsi que de démonter les phénomènes qui gouvernent l'écoulement. Dans une étude ultérieure menée par J.-M. Papillon et commanditée conjointement par l'Université de Sherbrooke et IBM, un banc d'essai de jets supersoniques sous-détendus impactants a été réalisé. Ce ba

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49

Craske, John. "Unsteady turbulent jets and plumes." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/44208.

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This thesis investigates the physics of statistically unsteady axisymmetric turbulent jets and plumes using theory and direct numerical simulation. The focus is on understanding and modelling the physics that govern the behaviour of radially integrated quantities, such as the integral scalar flux, momentum flux and buoyancy flux. To this end, a framework is developed that generalises previous approaches, making no assumption about the longitudinal velocity profile, turbulence transport or pressure. The framework is used to develop well-posed integral models that exhibit a good agreement with s

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50

Sol, Hélène. "Jets et sources radio extragalactiques." Paris 7, 1987. http://www.theses.fr/1987PA077163.

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Abstract (sommario):

Travaux sur les proprietes radiatives et dynamiques des jets associes a des galaxies ou a des quasars. L'etude du jet optique de la galaxie active pks 0521-36 est abordee en detail. On decrit ensuite le passage d'un jet vlbi de quelques pc a un jet observe a grande echelle sur plusieurs dizaines de kpc. On traite, sur ce sujet, des mecanismes physiques qui entrent en jeu pour interpreter ce phenomene. En derniere partie on pose le probleme de la determination de la constante de hubble en termes de mirages gravitationnels et celui des jets d'echelle stellaire

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