Thematische Bibliographien / Jet Surface Interaction

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Auswahl der wissenschaftlichen Literatur zum Thema „Jet Surface Interaction“

Autor: Grafiati

Veröffentlicht am 30. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Jet Surface Interaction"

Schweigert, I., S. Vagapov, L. Lin, and M. Keidar. "Plasma Jet Interaction with Dielectric Surface." Journal of Physics: Conference Series 1112 (November 2018): 012004. http://dx.doi.org/10.1088/1742-6596/1112/1/012004.

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Algwari, Qais Th, and Deborah O'Connell. "Plasma Jet Interaction With a Dielectric Surface." IEEE Transactions on Plasma Science 39, no. 11 (2011): 2368–69. http://dx.doi.org/10.1109/tps.2011.2160658.

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Rodko, Andrew, and Joseph C. Cataldo. "Interaction of Surface Waves and a Jet." International Journal of Fluid Mechanics Research 26, no. 5-6 (1999): 660–78. http://dx.doi.org/10.1615/interjfluidmechres.v26.i5-6.90.

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Chin, David A. "Model of Buoyant‐JET‐Surface‐Wave Interaction." Journal of Waterway, Port, Coastal, and Ocean Engineering 114, no. 3 (1988): 331–45. http://dx.doi.org/10.1061/(asce)0733-950x(1988)114:3(331).

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

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

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Luo, Shi-Jie, Yao-Feng Liu, and Yu-Wei Liu. "Visualization of asymmetric separation induced by lateral jet interaction on a slender body in supersonic flow." International Journal of Modern Physics B 34, no. 14n16 (2020): 2040081. http://dx.doi.org/10.1142/s0217979220400810.

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The lateral jet interaction on a slender body in supersonic flow was investigated by numerical simulation. The spatial and surface flow characteristics induced by jet interaction were shown. As a result, when the lateral jet is not in the longitudinal symmetry plane, the jet interaction causes asymmetric separation flow of surface and space, and destroys the pressure distributions of the slender body. With different angle of attack and circumferential positions of jet, the flow characteristic of the after body for jet in asymmetry plane changes greatly. The results with and without jet interaction also show that the far-field interaction played a major role in the lateral jet interaction.

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Madnia, C. K., and L. P. Bernal. "Interaction of a turbulent round jet with the free surface." Journal of Fluid Mechanics 261 (February 25, 1994): 305–32. http://dx.doi.org/10.1017/s0022112094000352.

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The interaction of a turbulent round jet with the free surface was investigated experimentally. Flow visualization, free-surface curvature measurements and hot-film velocity measurements were used to study this flow. It is shown that surface waves are generated by the large-scale vortical structures in the jet flow as they interact with the free surface. These waves propagate at an angle with respect to the flow direction which increases as the Froude number is increased. Propagation of the waves in the flow direction is suppressed by the surface current produced by the jet. Farther downstream the surface motions are caused by the large-scale vortical structures. Characteristic dark circular features are observed in shadowgraph images associated with concentrated vorticity normal to the free surface. The normal vorticity is believed to be the result of vortex line reconnection processes in the turbulent flow. Measurements of the mean velocity and turbulence intensity are reported. Owing to the confinement by the free surface, the decay rate of the maximum mean velocity is reduced by a factor of √2 compared to an unconfined jet.

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Luo, Shi Jie, Yao Feng Liu, and Ning Cao. "Numerical Simulation of Lateral Jet Interaction a Slender Body in Supersonic Flow." Applied Mechanics and Materials 404 (September 2013): 296–301. http://dx.doi.org/10.4028/www.scientific.net/amm.404.296.

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A numerical investigation has been conducted to research the interaction flowfield of lateral jet not in the longitudinal symmetry plane on a slender body with rudders in supersonic flow. The surface and space flow features of jet interaction flowfield with different angles of attack was analyzed. The paper also compared with and without jet interaction flowfield characteristics. As a result, the jet interaction destroys pressure distributions of the slender body, and causes normal and lateral loads. With angle of attack, the pressure distributions of the after body and rudders surfaces are change tempestuously. The results also show that the far-field interference played a major role in the lateral jet interaction. Besides, the force/moment amplification factors present highly nonlinear with angle of attack.

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Zhang, Fei Hu, Xiao Zong Song, Yong Zhang, and Dian Rong Luan. "Polishing of Ultra Smooth Surface with Nanoparticle Colloid Jet." Key Engineering Materials 404 (January 2009): 143–48. http://dx.doi.org/10.4028/www.scientific.net/kem.404.143.

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A nanoparticle colloid jet machining system has been developed for polishing ultra smooth surface of brittle materials. Interaction between nanoparticles and work surface in nanoparticle colloid jet machining has been given, and the theoretical dependence of the material removal rate with various important process parameters of the nanoparticle colloid jet machining have been investigated through material removal experiments. Some material removal results of nanoparticle colloid jet machining show that it is possible to obtain removal rates of one nanometer level per minute for glass surfaces with appropriate machining process parameters. A K9 glass surface was polished for obtaining ultra smooth surface. The surface roughness value of atomic force microscopy (AFM) observations is under 1nm Rms.

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Luo, Shi Jie. "Asymmetrical Lateral Jet Interaction on a Slender Body in Supersonic Flow." Applied Mechanics and Materials 565 (June 2014): 107–12. http://dx.doi.org/10.4028/www.scientific.net/amm.565.107.

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The lateral jet interaction on a slender body with rudders in supersonic flow had been investigated by numerical simulation, when the lateral jet is not in the longitudinal symmetry plane. It was called Asymmetrical lateral jet interaction in this paper. The flow features of jet interaction flowfield on the surface of the body or in the space far from the surface at different angles of attack and total pressure of jet was analyzed. As a result, the lateral jet interaction disturbed the pressure distributions of the slender body, and it was divided into near-field interaction near jet and far-field interaction aft-body on the basis of distance to jet. With the variety of the angle of attack and total pressure of jet, the pressure distributions at the aft-body change tempestuously, thereby the normal and lateral load will be from positive to negative, or reverse. The results also showed that the far-field interaction played a major role in the lateral jet interaction on a slender body in supersonic flow. The far-field interaction was caused by the changing of the outflow direction and intensity. Besides, the force/moment amplification factors presented highly nonlinear with the variety of angle of attack and total pressure of jet.

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Dissertationen zum Thema "Jet Surface Interaction"

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 consistency constant of the fluids helps in inhibition of the splash. At high Weber number the effects of surface tension and jet impingement angle were negligible compared to effects of Reynolds and Oldroyd numbers. But at smaller Weber number effects of surface tension were comparable to that of Reynolds number. It was also observed that the both normal (jet velocity) and tangential (surface speed) speeds play roles in splash-deposition dynamics. Newtonian liquid jet with smaller diameter illustrated that effect of surface tension becomes prominent only for liquids with low viscosities and for these liquids and 200 micron nozzle jets deposit up to 40 m/s. For high viscosity liquid same trend of deposition was observed and jets deposit up to 35 m/s. It was also observed that the jets of smaller viscosities spread on the surface very easily, making few micron sized lamella. Although higher viscosities liquid jets still spread very easily on the surface, the lamella thickness was much larger than that of low viscosity liquids. It was also found that mid-range viscosities jet started to splash at much lower velocities (13 m/s). This behavior is related to balancing of inertia forces by both the surface tension and viscous forces.

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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 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 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.

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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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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 heights to investigate the effects of surface roughness. High speed video imaging was employed to scrutinize the interaction between the impacting jet and the moving surface. For both Newtonian and Elastic liquids and all surfaces, decreasing the Reynolds number reduced the incidence of splash and consequently enhanced the transfer efficiency. At the elevated Weber numbers of the testing, the Weber number had a much smaller impact on splash than did the Reynolds number. The ratio of the surface velocity to the jet velocity has only a small effect on the splash, whereas increasing the roughness-height-to-jet-diameter ratio substantially decreased the splash threshold. Moreover, the Deborah number was also salient to the splash of elastic liquids.

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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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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 COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR 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 acúmulo de tensões térmicas na rocha, o qual pode acarretar sua fratura. Este tipo de processo também envolve diversos mecanismos aerodinâmicos e termodinâmicos, que são isoladamente fenômenos abertos. No desenvolvimento deste trabalho o escoamento foi modelado pelas equações de Navier - Stokes bidimensionais para uma mistura de gases perfeitos em um sistema de coordenadas cilíndrico. O modelo considerado para descrever o transporte turbulento é o modelo de uma equação de Spalart - Allmaras, o qual envolve a solução de uma equação diferencial para a viscosidade turbulenta. Estas equações são resolvidas utilizando-se uma metodologia de volumes finitos adaptada a escoamentos compressíveis. A descrição dos escoamentos transientes obtidos necessitou de diversas modificações ao código computacional existente. Estas modificações trataram, em particular, das condições de contorno, que utilizam a noção de características, e do modelo de turbulência. A estrutura do escoamento resultante da interação entre o jato supersônico e a parede é estudada, avaliando-se a influência (i) da distância entre a saída do jato e a parede, (ii) da razão de pressões entre o jato e o ambiente. Além disso, é examinada a evolução transiente do escoamento. Os resultados obtidos são analisados com vista a obter as melhores condições aerodinâmicas para o processo de descamação térmica. I in this work a study of the interaction between a supersonic jet and a planar surface is presented, with the aim to analyze the behavior of the velocity, pressure and temperature flowfield. This study finds its motivation in the process of thermal spallation of hard rocks, which may result from the interaction between a high pressure and high temperature jet and the rock. This process, that can be used in the drilling of hard and deep rocks, occurs due to the accumulation of thermal stresses in the rock, which can cause its fracture. This type of process also involves several aerodynamic and thermodynamic mechanisms, which are still open phenomena. In the development of this work the flow was modeled by the two-dimensional Navier-Stokes equation for a mixture of perfect gases in a cylindrical coordinates system. The model considered to describe the turbulent transport is the one equation of Spalart - Allmaras model, which involves the solution of a differential equation for the turbulent viscosity. These equations are solved using a finite volumes methodology which is adapted to compressible flows. The description of the obtained transient flow required several modifications in the existing computational code. These modifications involved, in particular, the choice of boundary conditions, that use the notion of characteristics, and the turbulence model. The structure of the flow resulting from the interaction between the supersonic jet and the wall is studied. In particular, are examined the influence (i) the distance between the jet and wall, (II) of the pressures ratio between the jet and the environment. Moreover, the transient evolution of the flow is examined. The obtained results are examined to determine the best aerodynamic conditions for the process of thermal spallation to occur.

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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 initial interaction between the fluid free surface and the inclined accelerating plate. \(^1\) Needham et al. The initial development of a jet caused by fluid, body and free surface interaction. The Quarterly Journal of Mechanics and Applied Mathematics. 61(4):581-614, 2008.

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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 avec trois types de surfaces (diélectrique, métallique et eau ultrapure) au moyen de différents diagnostics électriques et optiques afin de comprendre l'influence de la nature des surfaces sur les propriétés physiques du plasma et les espèces chimiques générées. La première partie de cette thèse s'intéresse à l'étude de l'influence des surfaces sur le jet de plasma. Différents paramètres sont étudiés, tels que la nature de la surface exposée, le débit de gaz, la distance entre la sortie du dispositif et la surface exposée ou encore la composition du gaz plasmagène. Pour ce faire, nous avons utilisé dans un premier temps l'imagerie Schlieren afin de suivre le flux d'hélium en sortie du dispositif en présence ou non de la décharge. La spectroscopie d'émission a été utilisée pour déterminer les espèces émissives générées par le plasma. L'imagerie rapide nous a permis de suivre la génération et la propagation de la décharge et la distribution de certaines espèces excitées dans le jet avec l'aide de filtres interférentiels passe-bandes. Une cible diélectrique entraîne un étalement de l'onde d'ionisation sur sa surface et une cible conductrice entraîne la formation d'un canal de conduction. L'évolution de la densité d'espèces excitées (OH*, N2*, He* et O*) augmente avec la permittivité relative de la surface traitée. Le rôle joué par les espèces actives générées par les jets de plasma est fondamental dans la cinétique et la chimie des mécanismes liés aux procédés plasma. La seconde étape de la thèse porte donc sur l'évaluation spatiale et temporelle des densités du radical hydroxyle OH, une espèce jouant un rôle majeur dans de nombreux mécanismes. La cartographie spatiale et l'évolution temporelle des densités absolues et relatives de OH ont été obtenues au moyen de diagnostics lasers LIF et PLIF. La densité de OH générée augmente avec la permittivité relative de la surface traitée. On constate que les radicaux OH restent présents dans le canal d'hélium entre deux décharges consécutives (plusieurs dizaines de microsecondes). Enfin, nous nous sommes intéressés à la production d'espèces réactives à longue durée de vie dans l'eau ultrapure traitée par plasma. L'influence de différents paramètres sur la concentration d'espèces dans l'eau traitée a été étudiée dans le but d'optimiser la production de ces espèces. Dans nos conditions expérimentales, la mise à la masse de l'eau ultrapure lors du traitement permet l'augmentation de la concentration de H2O2. Par ailleurs, la mise à la masse induit une diminution la concentration de NO2- Cold atmospheric pressure plasma jets are a subject of great interest in many biomedical fields for the past decade. In the various applications of these jets, the plasma generated can interact with many types of surfaces. Plasma jets influence the treated surfaces, but it is now well known that the treated surface also influences the plasma according to their characteristics. The work carried out in this thesis therefore aims to characterize a cold helium atmospheric pressure plasma jet in contact with three surfaces (dielectric, metallic and ultrapure water) by means of different electrical and optical diagnostics in order to understand the influence of the nature of the surfaces on the physical properties of the plasma and the chemical species generated. The first part of this thesis is focused on the study of the influence of surfaces on the plasma jet. Different parameters are studied, such as the nature of treated surfaces, the gas flow, the distance between the outlet of the device and the surface or the composition of the injected gas. For this purpose, helium flow at the outlet of the device is followed by Schlieren imagery with and without the discharge. Emission spectroscopy is used to determine the emissive species generated by the plasma. ICCD imagery is employed to follow the generation and the propagation of the discharge and the distribution of several excited species in the jet by using band-pass interference filters. A dielectric target causes the ionization wave to spread over its surface and a conductive target leads to the formation of a conduction channel. The evolution of excited species densities (OH*, N2*, He* and O*) increases with the relative permittivity of the treated surface. As well known, active species generated by plasma jets play a fundamental role in the kinetics and the chemistry of the mechanisms linked to plasma processes. The second part of the present work therefore relates to the spatial and temporal evaluation of the densities of the hydroxyl radical OH which plays a major role in many cellular mechanisms. The spatial mapping and the temporal evolution of the absolute and relative densities of OH are obtained by LIF and PLIF laser diagnostics. The density of OH generated increases with the electrical conductivity of the treated surface. It can be noted that the OH molecules remain present in the helium channel between two consecutive discharges (several tens of microseconds). Finally, we focus on the production of chemical species in ultrapure water treated with plasma. The influence of different parameters on the concentration of species in the treated water has been studied to optimize the production of chemical species. In experimental conditions, grounding the ultrapure water during treatment increases the concentration of H2O2. Furthermore, the grounding induces a decrease in the NO2- concentration

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Barillon, Bruno. "Interaction entre un jet gazeux chargé de particules réactives et une surface chaude : application à un procédé de dépôt de couches minces." Vandoeuvre-les-Nancy, INPL, 1996. http://docnum.univ-lorraine.fr/public/INPL_T_1996_BARILLON_B.pdf.

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Ce travail présente les résultats relatifs à l'étude d'un procédé original de dépôt de couches minces. Celui-ci repose sur la projection de particules transportées par un jet gazeux turbulent, sur un substrat chaud où elles subissent une transformation chimique donnant naissance à un dépôt uniforme et adhérent. Le rendement global du procédé dépend de plusieurs processus couples: hydrodynamique (écoulement du gaz vecteur et des particules), transferts de chaleur et de matière (gaz-particules-substrat) et caractéristiques chimiques des réactions. Une des originalités du travail est d'étudier chacun de ces facteurs de manière successive et indépendante afin d'en déterminer leur importance relative et d'identifier les étapes limitantes. L’étude est, de ce fait, menée en 3 étapes: maquettes froide, tiède et chaude. Les deux premières, effectuées avec des solides modèles, ont notamment permis de déterminer l'histoire thermique des particules. La dernière est réalisée en impulsionnel puis en continu avec des particules susceptibles de donner effectivement naissance à une couche mince. Un modèle est finalement proposé pour rendre compte et prévoir de façon très satisfaisante l'épaisseur du dépôt et le rendement du procédé

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Hofmans, Marlous. "Experimental characterization of helium plasma jets." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX062.

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Cette thèse porte sur l’étude d’un jet de plasma d'hélium à pression atmosphérique alimenté par des impulsions positives unipolaires à une fréquence de l’ordre du kHz. Des expériences sont effectuées pour caractériser la dynamique de propagation, la structure de l'écoulement et la température dans un jet en expansion libre, ainsi que l'influence d'une cible métallique sur le plasma.La spectroscopie à polarisation Stark indique un champ électrique axial d'environ 10 kV/cm dans le capillaire du jet et une augmentation jusqu'à 20 kV/cm dans le panache, qui est constante pour différentes amplitudes et durées de l'impulsion de tension appliquée. La diffusion Thomson et la diffusion Raman rotationnelle sont utilisées pour déterminer la densité électronique et la température électronique, à différentes positions axiales et radiales, ainsi que la température du gaz et la densité de N2 et O2 de l'air environnant qui sont mélangés dans le flux d’hélium.La comparaison quantitative de ces résultats expérimentaux avec les résultats d'un modèle fluide 2D montre une bonne concordance et permet une meilleure compréhension des résultats obtenus, à savoir que le champ électrique dans le front d'ionisation augmente avec la quantité d’air intégré au flux d’hélium au lond de la propagation. L'imagerie Schlieren révèle l'apparition de structures turbulentes à des débits élevés et lors de l'application des impulsions de tension. On constate que la température du gaz, mesurée par une sonde de température, augmente d'environ 12 C quand le plasma est allumé et d'environ 25 C lorsqu'une cible métallique est placée devant le jet This thesis studies an atmospheric pressure helium plasma jet that is powered by positive, unipolar pulses at a kHz frequency. Experiments are performed that focus on the propagation dynamics, flow structure and temperature in a freely expanding jet, as well as the influence of a metallic target on the plasma.Stark polarization spectroscopy yields an axial electric field of around 10 kV/cm in the capillary of the jet and an increase up to 20 kV/cm in the plume, which is constant for different amplitudes and durations of the applied voltage pulse. Thomson and rotational Raman scattering are used to determine the electron density and electron temperature, at different axial and radial positions, as well as the gas temperature and the density of N2 and O2 that are mixed into the helium from the surrounding air.Quantitative comparison of these experimental results with results from a 2D fluid model show a good agreement and allow for a better understanding of the obtained results, namely that the electric field in the ionization front depends linearly on the flow composition at that location. Schlieren imaging shows the onset of turbulent structures at high applied flow rates and at the application of the voltage pulses. The gas temperature, as measured by a temperature probe, is found to increase by around 12 C when the plasma is ignited and by around 25 C when a metallic target is placed in front of the jet

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Bücher zum Thema "Jet Surface Interaction"

Feyedelem, Michael S. Interaction of a swirling jet with a free surface. Naval Postgraduate School, 1996.

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Jones, Timothy. The interaction of gas jets with liquid surfaces. University of Birmingham, 1986.

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Raman, Ganesh. Enhanced mixing of an axisymmetric jet by aerodynamic excitation. Lewis Research Center, 1986.

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Raman, Ganesh. Enhanced mixing of an axisymmetric jet by aerodynamic excitation. Lewis Research Center, 1986.

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International Conference on Plasma Surface Interactions in Controlled Fusion Devices. (9th 1990 Bournemouth, England). JET papers presented at the 9th International Conference on Plasma Surface Interactions and Controlled Fusion Devices [Bournemouth, U.K. 2-25 May 1990]. JET Joint Undertaking, 1990.

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Ruban, Anatoly I. Classical Boundary-Layer Theory. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199681754.003.0002.

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Chapter 1 discusses the flows that can be described in the framework of Prandtl’s 1904 classical boundary-layer theory, including the Blasius boundary layer on a flat plate and the Falkner–Skan solutions for the boundary layer on a wedge surface. It presents Schlichting’s solution for the laminar jet and Tollmien’s solution for the viscous wake. These are followed by analysis of Chapman’s shear layer performed with the help of Prandtl’s transposition theorem. It also considers the boundary layer on the surface of a fast rotating cylinder with the purpose of linking the circulation around the cylinder with the speed of its rotation. It concludes discussion of the classical boundary-layer theory with analysis of compressible boundary layers, including the interactive boundary layers in hypersonic flows.

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Buchteile zum Thema "Jet Surface Interaction"

Oliver, J. F. "Ink/Paper Interactions in Ink Jet Printing (lJP)." In Surface and Colloid Science in Computer Technology. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1905-4_27.

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Mangiavacchi, N., R. Gundlapalli, and R. Akhavan. "Direct Numerical Simulations of a Turbulent Jet Interacting with a Free Surface." In Fluid Mechanics and Its Applications. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0457-9_63.

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Gourevitch, U. G., and E. B. Shoubin. "Modeling of the Flows with 3-D Separation Caused by Interaction of the Boundary Layers on the Interesting Surfaces." In Separated Flows and Jets. Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84447-8_15.

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Weinand, K., K. J. Dahlem, R. Höld, D. Stern, B. Sauerwein, and F. Seiler. "Analysis of Jet Thruster Control Effectiveness and the Interaction with Aerodynamic Surfaces for a Slender Cylindrical Missile." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14243-7_47.

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Pericleous, Koulis, Bruno Lebon, Georgi Djambazov, and Mayur Patel. "Mathematical Modeling of a Compressible Oxygen Jet Interacting with a Free Surface in a Basic Oxygen Furnace for Steel Production." In CFD Modeling and Simulation in Materials Processing. John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118364697.ch34.

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Dajuma, Alima, Siélé Silué, Kehinde O. Ogunjobi, et al. "Biomass Burning Effects on the Climate over Southern West Africa During the Summer Monsoon." In African Handbook of Climate Change Adaptation. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_86.

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AbstractBiomass Burning (BB) aerosol has attracted considerable attention due to its detrimental effects on climate through its radiative properties. In Africa, fire patterns are anticorrelated with the southward-northward movement of the intertropical convergence zone (ITCZ). Each year between June and September, BB occurs in the southern hemisphere of Africa, and aerosols are carried westward by the African Easterly Jet (AEJ) and advected at an altitude of between 2 and 4 km. Observations made during a field campaign of Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) (Knippertz et al., Bull Am Meteorol Soc 96:1451–1460, 2015) during the West African Monsoon (WAM) of June–July 2016 have revealed large quantities of BB aerosols in the Planetary Boundary Layer (PBL) over southern West Africa (SWA).This chapter examines the effects of the long-range transport of BB aerosols on the climate over SWA by means of a modeling study, and proposes several adaptation and mitigation strategies for policy makers regarding this phenomenon. A high-resolution regional climate model, known as the Consortium for Small-scale Modelling – Aerosols and Reactive Traces (COSMO-ART) gases, was used to conduct two set of experiments, with and without BB emissions, to quantify their impacts on the SWA atmosphere. Results revealed a reduction in surface shortwave (SW) radiation of up to about 6.5 W m−2 and an 11% increase of Cloud Droplets Number Concentration (CDNC) over the SWA domain. Also, an increase of 12.45% in Particulate Matter (PM25) surface concentration was observed in Abidjan (9.75 μg m−3), Accra (10.7 μg m−3), Cotonou (10.7 μg m−3), and Lagos (8 μg m−3), while the carbon monoxide (CO) mixing ratio increased by 90 ppb in Abidjan and Accra due to BB. Moreover, BB aerosols were found to contribute to a 70% increase of organic carbon (OC) below 1 km in the PBL, followed by black carbon (BC) with 24.5%. This work highlights the contribution of the long-range transport of BB pollutants to pollution levels in SWA and their effects on the climate. It focuses on a case study of 3 days (5–7 July 2016). However, more research on a longer time period is necessary to inform decision making properly.This study emphasizes the need to implement a long-term air quality monitoring system in SWA as a method of climate change mitigation and adaptation.

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Odetti, Angelo, Marco Altosole, Marco Bibuli, Gabriele Bruzzone, Massimo Caccia, and Michele Viviani. "Advance Speed-Hull-Pump-Jet Interactions in Small ASV." In Progress in Marine Science and Technology. IOS Press, 2020. http://dx.doi.org/10.3233/pmst200043.

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This paper is related to the technological development of an innovative small-size Autonomous Surface Vehicle designed to meet the requirement of accessing, monitoring and protecting the shallow waters peculiar of the Wetlands. The first prototype of a fully electric, modular, portable, lightweight, and highly-controllable Autonomous Surface Vehicle (ASV) for extremely shallow water and remote areas, namely SWAMP, was developed by CNR-INM and DITEN-Unige. This catamaran is equipped with four azimuth Pump-Jet Modular (PJM) actuators designed for small-size (1 to 1.5 m long) ASV. The main advantage of Pump-Jet thrusters is that they are flush with the hull, thus minimizing the risks of damages due to possible grounding. This system is used to increase the manoeuvrability in narrow spaces and to increase the spacial resolution by allowing the access also in extremely shallow waters with smaller risk of loosing manoeuvrability. The knowledge of the hydrodynamic characteristics of the thruster and of the vessel allows to partly or fully identifying the vessel for a better controllability. With this aim a series of tests have been conducted in the DITEN towing tank. In particular advance resistance on the SWAMP hull in deep and shallow water, bollard pull and self-propelling tests with the Pump-Jet Module working have been carried out. The results of the tests with the effects of advance speed on the PJM performance is reported in this paper together with the description of the modelling of the thruster itself.

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Rau, Matthew J., and Suresh V. Garimella. "Two-Phase Jet Impingement: Liquid–Vapor Interactions and Heat Transfer Mapping for Multiscale Surface Enhancement Design." In Encyclopedia of Two-Phase Heat Transfer and Flow III. WORLD SCIENTIFIC, 2018. http://dx.doi.org/10.1142/9789813229464_0006.

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Konferenzberichte zum Thema "Jet Surface Interaction"

Khavaran, Abbas. "Acoustics of Jet Surface Interaction - Scrubbing Noise." In 20th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-3314.

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Brown, Clifford A., and Mark P. Wernet. "Jet-Surface Interaction Test: Flow Measurement Results." In 20th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-3198.

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Brown, Clifford. "Jet-Surface Interaction Test: Far-Field Noise Results." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69639.

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Many configurations proposed for the next generation of aircraft rely on the wing or other aircraft surfaces to shield the engine noise from the observers on the ground. However, the ability to predict the shielding effect and any new noise sources that arise from the high-speed jet flow interacting with a hard surface is currently limited. Furthermore, quality experimental data from jets with surfaces nearby suitable for developing and validating noise prediction methods are usually tied to a particular vehicle concept and, therefore, very complicated. The Jet/Surface Interaction Test was intended to supply a high quality set of data covering a wide range of surface geometries and positions and jet flows to researchers developing aircraft noise prediction tools. During phase one, the goal was to measure the noise of a jet near a simple planar surface while varying the surface length and location in order to: (1) validate noise prediction schemes when the surface is acting only as a jet noise shield and when the jet/surface interaction is creating additional noise, and (2) determine regions of interest for more detailed tests in phase two. To meet these phase one objectives, a flat plate was mounted on a two-axis traverse in two distinct configurations: (1) as a shield between the jet and the observer (microphone array) and (2) as a reflecting surface on the opposite side of the jet from the observer. The surface was moved through axial positions 2 ≤ xTE/Dj ≤ 20 (measured at the surface trailing edge, xTE, and normalized by the jet diameter, Dj) and radial positions 1 ≤ h/Dj ≤ 20. Far-field and phased array noise data were acquired at each combination of axial and radial surface location using two nozzles and at 8 different jet exit conditions across several flow regimes (subsonic cold, subsonic hot, underexpanded, ideally expanded, and overexpanded supersonic cold). The far-field noise results, discussed here, show where the surface shields some of the jet noise and, depending on the location of the surface and the observer, where scrubbing and trailing edge noise sources are created as a surface extends downstream and approaches the jet plume.

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Rego, Leandro, Damiano Casalino, Francesco Avallone, and Daniele Ragni. "Noise Amplification Effects due to Jet-Surface Interaction." In AIAA Scitech 2019 Forum. American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-0001.

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Dawson, Martin, Jack Lawrence, Rodney Self, and Michael Kingan. "Modelling Jet-Surface Interaction Noise from Cranked Wings." In AIAA AVIATION 2020 FORUM. American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-2551.

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da Silva, Filipe D., Andrey R. da Silva, Cesar J. Deschamps, et al. "Effects of coherence on jet-surface interaction noise." In 22nd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-2860.

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Khavaran, Abbas, Richard Bozak, and Clifford A. Brown. "Jet Surface Interaction Noise in a Planar Exhaust." In 22nd AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-2863.

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Stich, Gerrit-Daniel, Jeffrey A. Housman, Joseph G. Kocheemoolayil, Cetin C. Kiris, and James E. Bridges. "Large-Eddy Simulation of Jet Surface Interaction Noise." In 25th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-2475.

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Podboy, Gary G. "Jet-Surface Interaction Test: Phased Array Noise Source Localization Results." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69801.

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An experiment was conducted to investigate the effect that a planar surface located near a jet flow has on the noise radiated to the far-field. Two different configurations were tested: 1) a shielding configuration in which the surface was located between the jet and the far-field microphones, and 2) a reflecting configuration in which the surface was mounted on the opposite side of the jet, and thus the jet noise was free to reflect off the surface toward the microphones. Both conventional far-field microphone and phased array noise source localization measurements were obtained. This paper discusses phased array results, while a companion paper discusses far-field results. The phased array data show that the axial distribution of noise sources in a jet can vary greatly depending on the jet operating condition and suggests that it would first be necessary to know or be able to predict this distribution in order to be able to predict the amount of noise reduction to expect from a given shielding configuration. The data obtained on both subsonic and supersonic jets show that the noise sources associated with a given frequency of noise tend to move downstream, and therefore, would become more difficult to shield, as jet Mach number increases. The noise source localization data obtained on cold, shock-containing jets suggests that the constructive interference of sound waves that produces noise at a given frequency within a broadband shock noise hump comes primarily from a small number of shocks, rather than from all the shocks at the same time. The reflecting configuration data illustrates that the law of reflection must be satisfied in order for jet noise to reflect off of a surface to an observer, and depending on the relative locations of the jet, the surface, and the observer, only some of the jet noise sources may satisfy this requirement.

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Brown, Clifford A. "Developing an Empirical Model for Jet-Surface Interaction Noise." In 52nd Aerospace Sciences Meeting. American Institute of Aeronautics and Astronautics, 2014. http://dx.doi.org/10.2514/6.2014-0878.

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