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Dissertations / Theses on the topic 'Jet interaction'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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1

Viti, Valerio. "Numerical Studies of the Jet Interaction Flowfield with a Main Jet and an Array of Smaller Jets." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/11267.

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A numerical study of a proposed innovative jet interaction configuration is presented. This work aimed at improving present-day jet interaction configurations in their applications as control thrusters on hypersonic vehicles. Jet thrusters are a useful control system for fast-moving vehicles flying in the upper layers of the atmosphere because of their effectiveness and responsiveness. They produce a strong and responsive lateral force on the vehicle through the interaction of two main mechanisms. The first mechanism comes from the momentum of the injectant itself, basically the thrust of the
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2

Kumar, Purushotam. "Liquid jet interaction with a moving surface." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/36767.

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An experimental study was conducted to study the splash-deposition characteristics of a liquid jet impinging on a moving surface. The main focus of this study was to determine the effects of fluid, flow and surface properties on the outcome of the jet impingement. Several parameters such as fluid viscosity, elasticity and surface tension, jet and surface velocity, jet diameter surface wettability and surface roughness were changed and their effects on splash-deposition characteristics were analyzed during this research work. For non-Newtonian fluids increase in the yield stress and consistenc
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3

Sementi, Joshua Paul. "A study of jet exhaust-wing interaction /." Thesis, Connect to this title online; UW restricted, 2005. http://hdl.handle.net/1773/10002.

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4

Christie, Robert. "Lateral jet interaction with a supersonic crossflow." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/6815.

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A lateral jet in a supersonic crossflow creates a highly complex three-dimensional flow field which is not easily predicted. The aim of this research was to assess the use of a RANS based CFD method to simulate a lateral jet in supersonic crossflow interaction by comparing the performance of available RANS turbulence models. Four turbulence models were trialled in increasingly complex configurations; a flat plate, a body of revolution and a body of revolution at incidence. The results of this numerical campaign were compared to existing experimental and numerical data. Overall the Spalart-Allm
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5

Nativi, Lorenzo. "Jet-wind interaction in neutron star mergers." Licentiate thesis, Stockholms universitet, Institutionen för astronomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-189245.

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Besides being sources of gravitational waves, there has been evidence that neutron starmergers release neutron-rich material suitable for the production of heavy r-process nuclei.The radioactive decay of these freshly synthesised elements powers a rapidly evolvingthermal transient, the “macronova” (also known as “kilonova”). Its spectral propertiesstrongly depend on the ejecta composition, since neutron rich material synthesises heavyr-process elements that can efficiently trap radiation inside the ejecta producing a longlasting signal peaking in the red part of the spectrum. The first detecti
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6

Claus, Malcolm. "Jet interaction effects on a hypersonic interceptor." Thesis, Kingston University, 2001. http://eprints.kingston.ac.uk/20674/.

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A series of experiments were undertaken at the Defence Evaluation Research Agency (DERA) Farnborough, within the Aero Physics group into the phenomenon called Jet Interaction (JI). Jet Interaction (JI) is produced by the interaction of a jet with the external flow around a vehicle. This study focused on investigating the effects of a divert thruster employed to provide a vehicle with a rapid divert capability on the external flow-field and on the induced forces and moments exerted on the vehicle by the jet. The research was based on studying the effects on a hypersonic interceptor sometimes re
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7

Salomé, Quentin. "Interaction jet radio-gaz dans des galaxies proches." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEO005/document.

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Les galaxies massives sont moins nombreuses que ce qui est attendu avec le modèle standard (le modèle Λ-CDM). Ceci ce traduit par une formation d’étoiles moins importante que prévue dans les galaxies. Pour expliquer celà, il est globalement accepté que des processus stoppent le formation d’étoiles. Pour les galaxies massives, ceci est expliqué par l’action des trous noirs supermassifs. En accrétant du gaz, le trou noir central produit de l’énergie et de l’impulsion. Quand l’accrétion devient importante, le trou noir forme un noyau actif de galaxie, et l’énergie peut ralentir la formation d’éto
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8

Wallis, Scott Evan. "Innovative Transverse Jet Interaction Arrangements in Supersonic Crossflow." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/36041.

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The experiments on this project proceeded on the premise that adding an array of auxiliary jets behind a main jet injector would alleviate the large region of low pressure typically found downstream of a normal, sonic injector in supersonic flow and also possibly increase in intensity of the upstream high-pressure region. The secondary jet would, in theory, "push" the primary jet further into the flow, increasing the size of the obstacle as seen by the flow. The resulting increased high pressure upstream of the flow would increase the force on the body. Also, the presence of secondary jets
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9

Powrie, Honor Elisabeth Georgette. "A study of the interaction between an underexpanded normal jet and a hypersonic free stream." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242791.

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10

Huppertz, Guido [Verfasser]. "Experimental Investigation of Engine Jet/Vortex Interaction / Guido Huppertz." Aachen : Shaker, 2010. http://d-nb.info/1120864828/34.

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11

Feyedelem, Michael S. "Interaction of a swirling jet with a free surface." Thesis, Monterey, California. Naval Postgraduate School, 1996. http://hdl.handle.net/10945/8548.

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Approved for public release; distribution is unlimited<br>The 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 a
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12

Baier, Florian. "Noise Radiation from a Supersonic Nozzle with Jet/Surface Interaction." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1617108352134538.

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13

Srinivasan, Ravichandra. "Improved understanding and control of high-speed jet interaction flows." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3055.

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A numerical study of the flow field generated by injection through diamondshaped orifices into a high-speed flow is presented in this document. Jet interaction flows have a wide range of applications in the field of engineering. These applications include the use of jets for fuel injection in scramjets, for reaction control of high-speed aerodynamic bodies and as cooling jets for skins of high-speed vehicles. A necessary requirement in the use of transverse jets for these and other applications is a thorough understanding of the physics of the interaction between the jet and freestream. This i
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14

Keshavarz, Bavand. "Newtonian and elastic liquid jet interaction with a moving surface." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/33875.

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In the railroad industry a friction modifying agent may be applied to the rail or to the wheel in the form of a liquid jet. In this mode of application the interaction between the high speed liquid jet and a fast moving surface is important. Seven different Newtonian liquids with widely varying shear viscosities along with twelve different solutions of polyethylenoxide (PEO) and water with varying relaxation times were tested to isolate the effect of viscosity and elasticity from other fluid properties. Tests for the Newtonian liquids were done with five surfaces having different roughness hei
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15

Yang, Li. "Ink-paper interaction : a study in ink-jet color reproduction /." Linköping : Univ, 2003. http://www.bibl.liu.se/liupubl/disp/disp2003/tek806s.pdf.

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16

Long, Ted Alan 1964. "Non-linear interaction of Azimuthal modes in an Axisymmetric jet." Diss., The University of Arizona, 1991. http://hdl.handle.net/10150/565535.

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17

Minton, Christopher Mills. "Wake Filling Techniques for Reducing Rotor-Stator Interaction Noise." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33990.

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Several flow control schemes were designed and tested to determine the most suitable method for reducing the momentum deficit in a rotor wake and thus attenuate rotor-stator interaction noise. A secondary concern of the project was to reduce the amount of blowing required air for wake filling and thus limit the efficiency penalty in an aircraft engine environment. Testing was performed in a linear blow down cascade wind tunnel, which produced an inlet Mach number of 0.345. The cascade consisted of five blades with the stagger angle, pitch, and airfoil cross-section representative of 90% spa
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18

Li, Tingwen. "Numerical investigation of the gas/spray jet interaction with fluidized beds." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/6049.

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In many industrial fluidized bed reactors, for example fluid catalytic cracking units, coaters and fluid cokers, the reactant feed is introduced into the system in the form of a gas jet or spray for different purposes. A good understanding of the interaction between the feed injection and the bed can lead to improved reactor design and operation. Despite the fact that numerical models and simulations have been used extensively to investigate fluidization processes, still little is known about the interactions of the jet/spray with fluidized beds. In this thesis, gas jets and liquid spray in
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19

Mitchell, G. "Interaction of a synthetic Jet with a thermal turbulent boundary layer." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492487.

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An experimental study has been performed to determine the influence of a synthetic jet on a thermal turbulent boundary layer. Measurements were carried out using a slot type synthetic jet operated in a water channel. PlV measurements were used to determine how the synthetic jet influenced the velocity field. Two formation methods of the synthetic jet were observed. At high jet to crossflow velocity ratios, the vortices produced by the jet move away from the wall, whereas at low velocity ratios they remain near the surface. As a result of the jet/crossflow interaction, there is a zone of revers
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20

Myrillas, Konstantinos. "Experimental and numerical investigation of gas jet and liquid film interaction." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209848.

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The topic of this thesis is the interaction between gas jet flow and a liquid film dragged by a solid substrate. This method, known as jet-wiping, is used in several industrial processes. Hot-dip galvanization of steel strips is an important application, where jet wiping is used to control the thickness of the liquid zinc that is applied on a continuous steel substrate. Unsteady phenomena in the process lead to the creation of waves on the liquid film, which is known as undulation. This unwanted phenomenon deteriorates the quality of the final product.<p>The aim of the current study is to iden
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21

Brichet-Besson, Gwendoline. "Etude du bruit d'un jet double flux installé sous un profil d'aile." Thesis, Ecully, Ecole centrale de Lyon, 2015. http://www.theses.fr/2015ECDL0045.

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Cette étude porte sur le développement d’une méthodologie de calcul pour évaluer les effets d’installation. Ce phénomène, qui représente le bruit d’interaction entre un jet double flux et un profil, constitue un problème modèle pour l’étude du bruit de jet installé en aéronautique. L’écoulement moyen est déterminé à partir de la résolution des équations de Navier-Stokes moyennées et du modèle de turbulence k - ω BSL de Menter. Lorsque le jet est isolé, il est possible ensuite d’utiliser le modèle de Tam &amp; Auriault. Dans des configurations plus complexes, comme l’interaction jet-voilure con
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22

Depommier, Guillaume. "Analyse de l'interaction entre un jet turbulent et un tourbillon." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00814804.

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Cette thèse a pour but l'analyse de l'interaction entre un jet turbulent et un tourbillon de sillage, dans la phase dite d'interaction du régime de sillage. C'est à dire lorsque le jet s'enroule autour du tourbillon car sa vitesse axiale n'est plus suffisamment élevée pour résister à l'attraction de ce tourbillon. Il y a alors un changement dans la nature de la turbulence du jet : des structures tourbillonnaires plus intenses émergent et perturbent le tourbillon autour duquel elles s'enroulent. Parmi les mécanismes physiques intervenant au cours de l'interaction, le travail effectué au cours d
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23

Park, Heungsup. "Drop impingement and interaction with a solid surface." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/8236.

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24

Green, James G. "Turbulence structure resulting from interaction between an embedded vortex and wall jet." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27318.

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25

PEREZ, MARIA ANGELICA ACOSTA. "NUMERICAL STUDY OF THE INTERACTION BETWEEN A SUPERSONIC JET AND PLANAR SURFACE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2008. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=12412@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Neste trabalho é apresentado o estudo da interação entre um jato supersônico e uma superfície plana, com o objetivo de analisar o comportamento do campo de velocidade, pressão e temperatura do escoamento. Este estudo encontra sua motivação no processo de descamação térmica de rochas duras, a qual pode resultar da iteração entre um jato a alta pressão e temperatura e a rocha. Este processo, que pode ser útil na perfuração de rochas duras e profundas, ocorre devido ao acúm
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26

Barat, Robert Benedict. "Characterization of the mixing / chemistry interaction in the toroidal jet stirred combustor." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/97947.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1990.<br>Title as it appears in the M.I.T. Graduate List, Feb. 1990: Characterization of the chemistry / mixing interaction in a toroidal jet stirred combustor.<br>Includes bibliographical references (leaves 175-178).<br>by Robert Benedict Barat.<br>Ph.D.
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27

Valenzuela, Calva Fernando. "Numerical investigation of the interaction of synthetic jets with a laminar boundary layer and the effect of jet orientation." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/numerical-investigation-of-the-interaction-of-synthetic-jets-with-a-laminar-boundary-layer-and-the-effect-of-jet-orientation(5cc80987-a9e1-48ac-9e0f-18067c5f48fe).html.

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In 2009, based on its commitment to take action on the climate change, the aviation industry accorded a group of objectives to reduce carbon dioxide emissions. Although only 2% of all human-induced carbon dioxide (CO2) emissions are produced by the global aviation industry, the aviation industry is set to grow in the next 30 years. In order to maintain this growth without increasing its negative environmental impact, the future aircraft have to be cleaner and greener. In order to reduce carbon emissions and increase the operative efficiency, novel technologies have been developed and applied o
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28

El-Okda, Yasser Mohamed. "Jet/Wall Interaction: An Experimental Study with Applications to VSTOL Aircraft Ground Effects." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/32207.

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The flow field of a twin jet impinging on ground plane with and without free-stream and at low jet-height-to-diameter ratios was investigated using the Particle Image Velocimetry (PIV) technique. Detailed, time-averaged flow field data are obtained via the high-resolution and the high-sampling rate instantaneous velocity field that is made available via the PIV technique. A model of twin jet issuing from 0.245m circular plate, with 0.019m jet exit diameter, and with jet span to diameter ratio of 3.0 is placed in a water tunnel with the jets in tandem arrangement with respect to the free-stream
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29

Blanchard, Jean-Noël. "Etude d'une interaction d'un jet bidimensionnel avec un écoulement transversal perpendiculaire et confiné." Lille 1, 1996. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1996/50376-1996-294.pdf.

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On étudie expérimentalement l'interaction d'un jet issu d'une fine fente rectangulaire perpendiculaire à un écoulement transversal en milieu confiné. Différentes techniques optiques non intrusives (tomographies laser à fluorescence induite, anémométrie laser à effet doppler, filets colorés, particle streak velocimetry, particle tracking velocimetry) sont employées afin d'appréhender cette configuration complexe. Dans une première partie de l'étude, une description de l'écoulement moyen est obtenue par le biais de relevés anémométriques et de visualisations réalisées dans les trois directions n
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30

Wrisdale, Ian Edward. "Flow prediction for three-dimensional intakes and ducts using viscous-inviscid interaction methods." Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293854.

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31

Murphy, Barbara Anne. "INVESTIGATIONS OF CIRCADIAN REGULATION AND IMMUNE-CIRCADIAN INTERACTION IN THE HORSE." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_diss/546.

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The circadian system provides animals with a means to adapt internal physiology to the constantly changing environmental stimuli that exists on a rotating planet. Light information is translated into molecular timing mechanisms within individual pacemaker cells of the mammalian hypothalamic suprachiasmatic nucleus (SCN) via transcriptionaltranslational feedback loops. Humoral and neural outputs from this master clock result in circadian rhythms of physiology and behavior. The hierarchy of the circadian system involves SCN synchronization of cellular clocks within peripheral tissues so that dif
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32

Zaki, Mazen. "Modélisation et simulation numérique du procédé de perçage non débouchant par jet d’eau abrasif." Paris, ENSAM, 2009. http://www.theses.fr/2009ENAM0019.

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Actuellement, nous assistons à une croissance forte de l'emploi des machines d'usinage par jet d'eau haute pression (HP) dans de nombreuses applications industrielles, notamment celle du perçage. Afin d'accompagner cette tendance et pour permettre une avancée technologique significative de ce procédé de fabrication, nous nous proposons, dans le cadre de cette thèse, de modéliser et simuler numériquement le perçage par jet d'eau abrasif. Aujourd'hui, pour étudier l'interaction d'un jet d'eau chargé de particules avec la matière dans le cadre du perçage et ainsi comprendre le mécanisme d'enlèvem
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33

Crowe, Adam. "Inclined Negatively Buoyant Jets and Boundary Interaction." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2013. http://hdl.handle.net/10092/7895.

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Inclined negatively buoyant jets are commonly used to dispose brine effluent produced by desalination plants. Desalination and associated research has expanded in recent years due to the continued depletion and degradation of natural potable water sources. Desalination plants are the preferred option for meeting water demand deficits in many countries around the world. Inclined negatively buoyant jets are produced when the brine is discharged at an upward inclined angle via an offshore pipeline and diffuser system. Previous experimental studies have focused on the rapid mixing and dilution ach
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34

Vollmer, David Russell. "Interaction of jet/front systems and mountain waves : implications for lower stratospheric aviation turbulence /." Raleigh, N.C. : Ft. Belvior, VA : Springfield, Va. : North Carolina State University ; Available to the public through the Defense Technical Information Center ; National Technical Information Service [distributor], 2008. http://www.dtic.mil/dtic/.

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Thesis (Ph.D. in Philosophy (Marine, Earth, and Atmospheric Sciences))--North Carolina State University, July 2008.<br>Title from reproduction cover. "July 2008." Thesis advisor(s): S. Pal Arya and Michael L. Kaplan. Performed by North Carolina State University; sponsored by the United States Air Force Institute of Technology, Wright-Patterson Air Force Base, Ohio. Includes vita. "A dissertation submitted to the Graduate Faculty of North Carolina State University in partial fulfillment of the requirements for the Degree of Doctor of Philosophy, Marine, Earth, and Atmospheric Sciences from Nort
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35

Gallagher, Meurig Thomas. "The initial development of a jet caused by fluid, body and free surface interaction." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5913/.

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The aim of this thesis is to investigate the problem of a rigid plate, inclined at an angle α ∈(0,1/2π) the horizontal, accelerating uniformly from rest into or away from a semi-infinite expanse of inviscid, incompressible fluid. This work generalized that of Needham, Chamberlain, and Billingham\(^1\), by considering the case of negative plate accelerations. We use the method of matched asymptotic expansions to investigate the asymptotic structure of the solution to the free surface evolution problem as t→0\(^+\), paying particular attention to the innermost asymptotic region encompassing the
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36

Robin, Lionel. "Etude cinétique et interaction de paroi dans un jet de plasma d'azote basse pression." Rouen, 1992. http://www.theses.fr/1992ROUES031.

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Le travail présenté dans ce mémoire s'intègre dans une série d'études entreprises dans le but de mieux appréhender les phénomènes physico-chimiques et hydrodynamiques lors de la phase de rentrée d'engins spatiaux dans l'atmosphère terrestre. Le milieu d'étude est un jet de plasma d'azote, fortement dissocié sous pression réduite (0,8 Torr) généré à partir d'un plasmatron type arc soufflé avec étage de transfert. L'analyse des cinétiques chimiques mises en jeu dans le jet libre est en situation de couche limite pariétale, ainsi que les conditions limite à l'interface plasma-paroi entre le régim
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37

Maltoni, Matteo. "Probing anomalous gluon self-interaction at the LHC." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21269/.

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The LHC experiment at CERN has established a golden era for precision measurements in particle physics, opening the possibility to detect deviations from the Standard Model predictions and constrain the new physics, up to the multi-TeV scales. In this work, a procedure is described to use this data to obtain bounds on a higher-dimensional operator, that describes new gluon self-interactions than the Standard Model ones, in an Effective Field Theory framework. In Chapter one, the Standard Model is breefly rehearsed: in Chapter two, the LHC main features are overviewed. In Chapter three, the Eff
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38

Moreau, Julien. "Interaction entre un jet et un tourbillon compressé. Etude expérimentale de l'aérodynamique et de mélange." Phd thesis, Institut National Polytechnique de Toulouse - INPT, 2003. http://tel.archives-ouvertes.fr/tel-00007174.

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Les écoulements internes et le mélange prenant place pendant la phase de compression d'un cylindre moteur constituent des facteurs clés en vue de l'optimisation du moteur ainsi que des émission polluantes. Le cadre contractuel de ce travail est un projet collaboratif mettant en oeuvre les constructeurs automobiles (PSA, Renault) le CNRS ainsi que l'ADEME. Une installation expérimentale existante a été exploitée. Nous avons apporté des modification permettant de réaliser une injection directe au sein de la chambre. Nous avons pu rassembler une base de donnée importante et fiable. Des techniques
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39

Almeida, H. M. D. S. "Study of the interaction of a jet and a uniform stream using pulsed-wire anemometry." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/37923.

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40

Joly, Cécile. "Simulations numériques d'un jet rond turbulent et de son interaction avec un tourbillon de sillage." Université de Marne-la-Vallée, 2002. http://www.theses.fr/2002MARN0147.

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Le contexte général de cette étude concerne l’impact des traînées de condensation, ces fameux panaches blancs fréquemment observés dans le sillage des avions, sur l’atmosphère. D’un point de vue aérodynamique, la formation des traînées de condensation se caractérise par l’interaction entre un jet turbulent et un tourbillon de sillage. L’objectif de cette thèse est de contribuer à une meilleure compréhension des phénomènes thermiques et dynamiques mis en jeu dans cet écoulement. Ce travail repose sur la résolution numérique des équations de Navier-Stokes, et de conservation de l’énergie, formul
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41

Moreau, Julien. "Interaction entre un jet et un tourbillon compressé : étude expérimentale de l'aérodynamique et du mélange." Toulouse, INPT, 2003. http://www.theses.fr/2003INPT049H.

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Les qualités de la combustion dans les cylindres moteurs ainsi que les émissions polluantes résultent d'un couplage entre le mélange et le niveau élevé de turbulence en fin de compression. La solution proposée est l'étude de la possibilité de réaliser une stratification du mélange en utilisant la structure dissipative de type "tumble" pour transporter le carburant jusqu'à la bougie. Une configuration modèle a donc été mise en place afin d'étudier l'interaction entre un jet d'air et une structure tourbillonnaire compressée. Des campagnes expérimentales par vélocimétrie par image de particules (
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42

Ahmed, Ishtiaq. "The interaction of synthetic jets with attached and separating turbulent boundary layer." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/the-interaction-of-synthetic-jets-with-attached-and-separating-turbulent-boundary-layer(1c09d1b2-ca0f-4e60-afc9-8279d879747b).html.

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Like virtually every other human activity, air transport has an impact on the environment and similar to all other industries environmental impacts and economic issues are exerting more pressure on aircraft sector to meet the demands and implicated conditions. Secondly in today’s competitive industrial performance index new modern techniques are being introduced to improve the aerodynamics so that the efficiency of the newly designed aircrafts could be enhanced. The active flow control techniques have been proved vital towards achieving more effective air flow on the aircraft wing and that eve
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43

Lecoanet, Alexandre. "Étude de l'ablation d'une paroi solide par un jet liquide." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0015.

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En cas de fusion du cœur d’un réacteur nucléaire à neutrons rapides refroidi au sodium (RNR-Na), il est important d’extraire le corium ainsi produit du cœur. Pour ce faire, il est possible d’insérer au sein du cœur du réacteur des tubes de déchargement débouchant dans le collecteur froid. Ils permettraient d’évacuer le corium vers un récupérateur placé dans le fond de la cuve du réacteur. Ce récupérateur faciliterait le refroidissement du corium, en augmentant sa surface d’échange avec le sodium. Néanmoins, le jet de corium sortant des tubes de déchargement à une température supérieure à 2 000
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44

Masqué, Saumell Josep Maria. "The star-forming core ahead of HH 80N: studying the interaction with a parsec scale jet." Doctoral thesis, Universitat de Barcelona, 2012. http://hdl.handle.net/10803/81011.

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The region GGD 27, located in Sagittarius at a distance of 1.7 kpc, is an active star forming region. The most well-known observational signature of this region, the HH 80/81/80N jet, is one of the largest collimated jet system known so far, spanning over a total length of about 5 pc. Ahead of the Herbig-Haro object HH 80N, assumed to be the northern head of the jet, there is a dense core of 0.3 pc in size and mass of 20 M (HH 80N core) that exhibits peculiar chemistry, possibly induced by the UV radiation incoming from the HH object. In addition, the HH 80N core has star forming signatures
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45

Bahnev, Blagovest. "Electrical and optical characterisation of an atmosphere pressure plasma jet and its interaction with plasmid DNA." Thesis, Open University, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543860.

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46

Cosimi, Julien. "Caractérisations d'un jet de plasma froid d'hélium à pression atmosphérique." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30136.

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Les jets de plasma froid à la pression atmosphérique connaissent un réel engouement dans de nombreux domaines du biomédical depuis la dernière décennie. Dans les différentes applications de ces jets, le plasma généré est amené à interagir avec de nombreux types de surfaces. Les jets de plasma ont une influence sur les surfaces traitées, mais il est maintenant connu que les surfaces traitées influencent également le plasma en fonction de leurs caractéristiques. Le travail mené dans cette thèse a donc pour but de caractériser un jet de plasma froid d'hélium à la pression atmosphérique en contact
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47

Tazibt, Abou-el-Foutouh. "Étude théorique et expérimentale du processus d'accélération de particules abrasives dans un jet d'eau sous très haute pression : interaction avec le matériau à découper." Lille 1, 1995. http://www.theses.fr/1995LIL10003.

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L'utilisation de la technologie du jet d'eau abrasif comme procédé de découpage à froid de matériaux tels que les composites et métaux, trouve des champs d'applications divers (aéronautique, industrie de l'automobile, génie civil). Bien que ce procédé soit utile, son support théorique est loin d'être maîtrisé quant à l'optimisation du grand nombre de paramètres de travail (pression hydraulique, débit d'abrasif, profondeur de coupe). La résolution de ce problème ne peut être effective que si l'on considère les facteurs qui conduisent principalement au phénomène de coupe. En effet, grâce à l'éne
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48

Fournier, Christophe. "Calcul de l'écoulement visqueux se développant sur une aube de turbine en présence d'un film de refroidissement." Ecully, Ecole centrale de Lyon, 1995. http://www.theses.fr/1995ECDL0003.

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L'objectif de cette thèse est le développement d'un modèle de calcul de l'écoulement visqueux se développant sur une aube de turbine en présence de film de refroidissement. Le refroidissement des étages haute pression des turbines aéronautiques est assuré par des injections discrètes de fluide froid à la paroi des éléments les constituant. La puissance actuelle des calculateurs ne permet pas un calcul complet de tels écoulements. Nous avons développé un modèle de calcul de l'écoulement visqueux se développant sur une aube de turbine en présence d'une ou plusieurs rangées de jets discrets. La p
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49

Klapdor, Eva Verena [Verfasser], Johannes [Akademischer Betreuer] Janicka, and Heinz-Peter [Akademischer Betreuer] Schiffer. "Simulation of Combustor-Turbine Interaction in a Jet Engine / Eva Verena Klapdor. Betreuer: Johannes Janicka ; Heinz-Peter Schiffer." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2011. http://d-nb.info/1105562603/34.

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50

Cazaubon, Bertrand. "Étude par spectrométrie de masse quadripolaire d'un jet pulsé d'oxygène atomique et de son interaction avec les matériaux." Toulouse, ENSAE, 1996. http://www.theses.fr/1996ESAE0012.

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En environnement spatial d'orbite basse, les matériaux de revêtement externes des engins spatiaux subissent d'importantes dégradations, notamment dues à l'action de l'oxygène atomique. Le jet pulsé d'oxygène atomique rapide, utilisé dans le simulateur, a été caractérisé par spectrométrie de masse quadripolaire. Cet appareil de mesure, dans un mode de fonctionnement adapté au caractère spécifique de l'expérience, permet l'analyse qualitative des espèces ioniques positives et neutres présentes dans le jet. La méthode d'analyse, par mesure de temps de vol, permet de déterminer les distributions t
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