Bibliografías temáticas / Side-Jets

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Literatura académica sobre el tema "Side-Jets"

Autor: Grafiati
Publicado: 29 de marzo de 2025

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Artículos de revistas sobre el tema "Side-Jets"

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MURAMATSU, Akinori, Kuu Kashino y Seiichi Terahara. "Side jets in strongly-forced round air jets". Journal of the Visualization Society of Japan 28-1, n.º 2 (2008): 1009. http://dx.doi.org/10.3154/jvs.28.1009.

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MORIMOTO, Kenta y Yuichi ITOH. "20615 Numerical Simulation of Side-jets generated from Round Jets". Proceedings of Conference of Kanto Branch 2014.20 (2014): _20615–1_—_20615–2_. http://dx.doi.org/10.1299/jsmekanto.2014.20._20615-1_.

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Monkewitz, Peter A., Bernhard Lehmann, Bernd Barsikow y Dietrich W. Bechert. "The spreading of self‐excited hot jets by side jets". Physics of Fluids A: Fluid Dynamics 1, n.º 3 (marzo de 1989): 446–48. http://dx.doi.org/10.1063/1.857467.

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MURAMATSU, Akinori, Mirko GAMBA y Noel T. CLEMENS. "Flow Visualization of Side Jets in Helium Gas Jets by PLMS". Journal of the Visualization Society of Japan 27, Supplement2 (2007): 59–60. http://dx.doi.org/10.3154/jvs.27.supplement2_59.

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Brancher, P., J. M. Chomaz y P. Huerre. "Direct numerical simulations of round jets: Vortex induction and side jets". Physics of Fluids 6, n.º 5 (mayo de 1994): 1768–74. http://dx.doi.org/10.1063/1.868238.

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Monkewitz, Peter A. y Eberhard Pfizenmaier. "Mixing by side jets’’ in strongly forced and self‐excited round jets". Physics of Fluids A: Fluid Dynamics 3, n.º 5 (mayo de 1991): 1356–61. http://dx.doi.org/10.1063/1.858065.

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MIZUSHIMA, J. y Y. KAWAGUCHI. "Transitions of flow past a row of square bars". Journal of Fluid Mechanics 405 (25 de febrero de 2000): 305–23. http://dx.doi.org/10.1017/s0022112099007399.

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Transitions of flow past a row of square bars placed across a uniform flow are investigated by numerical simulations and the bifurcation analysis of the numerical results. The flow is assumed two-dimensional and incompressible. It is already known that jets coming through gaps between square bars are independent of each other when the pitch-to-side-length ratio of the row is large, whereas the confluence of two or three jets occurs due to a first pitchfork bifurcation from the flow with independent jets when the pitch-to-side-length ratio is small. It is found that confluence of four jets occurs in consequence of the second pitchfork bifurcation from the flow with pairs of jets joined to each other. Bifurcation diagrams of the flow are obtained, which include confluences of double, triple and quadruple jets. Lengths of the twin vortices are evaluated for each flow pattern. The confluences of two, three and four jets are qualitatively confirmed experimentally by flow visualizations.
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YAO, YUFENG. "DIRECT NUMERICAL SIMULATION OF MULTIPLE JETS IN CROSS-FLOW". Modern Physics Letters B 23, n.º 03 (30 de enero de 2009): 249–52. http://dx.doi.org/10.1142/s0217984909018126.

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Direct numerical simulation has been performed to study flow interactions in multiple jets in cross-flow. Configurations considered are twin jets side-by-side and triple jets in tandem. Computations are carried out at the jet to cross-flow velocity ratio of 2.5 and the Reynolds number 225 based on the free-stream quantities and the jet width D . For twin jets, results show that in the vicinity of jet exits, the merging of two counter rotating vortex pairs (CRVP) is strongly dependent on the gap of two jets. Downstream in the far-field, a large single CRVP dominates. The simulation is in qualitatively good agreement with the experimental findings by other researchers. For triple jets, more complicated flow structures are revealed, in which a total of three vortex pairs has been identified, but none of them is dominating. The observations of complex flow structure could assistant relevant industrial applications.
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BRUNA, ELENA. "DI-JET MEASUREMENTS IN HEAVY-ION COLLISIONS AT STAR". International Journal of Modern Physics E 20, n.º 07 (julio de 2011): 1551–55. http://dx.doi.org/10.1142/s0218301311019854.

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Jets are produced from hard scatterings in the early stages of heavy-ion collisions. It is expected that these high-pT partons travel through the hot and dense medium before fragmenting. Therefore they are expected to suffer energy loss in the QGP via gluon radiation and elastic collisions along their path. Measurements of fully reconstructed jets help understand the effect of the energy loss on the jet structure and energy profile. A data-driven characterization of the background in Au + Au is needed in order to compare the results to p + p . The full azimuthal coverage of STAR Time Projection Chamber and Electromagnetic Calorimeter allows measurements of fully reconstructed di-jets, defined by jets that match the online trigger and recoil jets on the away side. A tight selection of the trigger jets allows for a selection of those coming from the surface. Hence, the population of jets on the recoil side is biased towards a maximal energy loss because of the extreme in-medium pathlength. We present measurements of di-jets, exploring their structure and properties in Au + Au and p + p at [Formula: see text] in the STAR experiment.
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KATO, Yushi y Akinori MURAMATSU. "Effect on Initial Velocity Gradient on Side-Jets Formation in a Round Jets". Proceedings of the Fluids engineering conference 2018 (2018): OS5–9. http://dx.doi.org/10.1299/jsmefed.2018.os5-9.

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Tesis sobre el tema "Side-Jets"

1

Al-Hasnawi, Adnan Ghareeb Tuaamah [Verfasser] y Eckehard [Akademischer Betreuer] Specht. "Mixing behaviour of side injection of air jets and gaseous fuel jets into the axial flow of tunnel kilns / Adnan Ghareeb Tuaamah Al-Hasnawi ; Betreuer: Eckehard Specht". Magdeburg : Universitätsbibliothek, 2016. http://d-nb.info/1117085953/34.

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Al-Hasnawi, Adnan Ghareeb Tuaamah Verfasser] y Eckehard [Akademischer Betreuer] [Specht. "Mixing behaviour of side injection of air jets and gaseous fuel jets into the axial flow of tunnel kilns / Adnan Ghareeb Tuaamah Al-Hasnawi ; Betreuer: Eckehard Specht". Magdeburg : Universitätsbibliothek, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:ma9:1-8342.

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Kisieliauskas, Vaidas. "Vėjo įtaka purkštukų išpurškiamų lašelių sklaidai". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090609_120811-84776.

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Santrauka Darbo apimtis 53 puslapiai, įskaitant 51 paveikslėlį, 5 lenteles. Informacijos šaltinių sąraše 26 šaltiniai. Darbo pradžia 2007 09 01, pabaiga 2009 05 19. Darbo objektas – skirtingos konstrukcijos purkštukai (skylinis kūgiško srauto, plyšinis plokščiasrautis ir inžektorinis (pneumohidraulinis)). Darbo tikslas – ištirti vėjo greičio įtaką skirtingos konstrukcijos purkštukais išpurškiamų skysčio lašelių sklaidai. Darbo metodai. Taikytas literatūros šaltinių loginės analizės metodas. Tyrimo stende buvo panaudoti 3 skirtingos konstrukcijos purkštukai. Jais išpurkštas skystis buvo apipučiamas ašinio ventiliatoriaus sukuriamu skirtingo stiprumo (greičio) oro srautu. Gauti tyrimų duomenys įvertinti dispersinės ir koreliacinės-regresinės analizės metodais. Darbo rezultatai. Išanalizavus purkštukų gamintojų pateiktą informaciją ir remiantis mokslininkų atliktų tyrimų rezultatais galima teigti, kad vėjo greitis yra svarbiausias meteorologinis veiksnys, nuo kurio labai priklauso išpurkšto skysčio lašelių nunešimas pavėjui. Be to, nustatyta, kad, išpurkšto skysčio lašelių nunešimas pavėjui ženkliai priklauso ir nuo purkštukų konstrukcijos. Apibendrinus visų trijų purkštukų tyrimų rezultatus, nustatyta, kad vidutiniškai, plote nutolusiame nuo purkštuko pastatymo vietos vėjo kryptimi nuo 0,5 m iki 2,0 m, pasklinda 30%, o nuo 2,0 m iki 4,5 m – dar apie 7% lašelių, kai šoninio vėjo greitis siekia 8,2±0,1 m•s-1. Inžektorinio (pneumohidraulinio) purkštuko tyrimų rezultatus lyginant... [toliau žr. visą tekstą]
Summary Scope of work page 53, including 51 picture, 5 tables. The information sources listed 26 sources. Beginning in 2007 09 01, the end of 2009 05 29. Work item – the construction of the nozzles (conical flow skyline, Slit flat flow and injector nozzles (pneumohydraulic)). The aim – to explore the wind velocity influence on the design of different nozzles spray liquid dispersion of droplets. Working methods. Literature sources used for logic analysis method. The study as were used for construction of 3 different nozzles. They sprayed the liquid was mutual axial fan creates a difference in the strength (speed) of air flow. To obtain data to assess the dispersed and the correlation-regression analysis. Results of the work. The analysis of the information submitted by the nozzles and on the basis of research carried out by the results of research can be said that the wind speed is the most important meteorological factor, which relies heavily on sprayed liquid droplets leeway tailwind. In addition, the sprayed liquid droplets leeway tailwind significantly depends on the injector design. The synthesis of all three nozzles studies found that, on average, an area remote from the nozzles built of local wind direction from 0.5 m to 2.0 m, at the 30% and from 2.0 m to 4.5 m – still about 7 % droplets, when the lateral wind speed is 8.2 ± 0.1 m • s-1. Injector nozzles (pneumohydraulic) nozzles test results compared with Slit flat flow results can be said that the tailwind of... [to full text]
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4

Walter, Léo. "Étude expérimentale et théorique du mélange d'un jet léger". Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0071.

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L'objectif de cette thèse est d'étudier les mécanismes physiques qui gouvernent l'évolution et le mélange des jets latéraux au sein des jets ronds de mélange binaire à faible densité, au moyen d'une double approche numérique et expérimentale. Les mécanismes physiques à l'origine des jets latéraux restent encore incertains et sont en lien direct avec le développement d'instabilités secondaires responsables de la tridimensionalisation de l'écoulement. Ainsi, une meilleure compréhension de ces mécanismes en jeu constitue un prérequis indispensable à la conception d'une stratégie de contrôle qui vise à promouvoir le mélange entre le jet et l'environnement ambiant.L'objectif de l'étude numérique est d'identifier les mécanismes transitoires qui influencent la croissance des perturbations tridimensionnelles dans le jet rond à faible masse volumique, en particulier dans les conditions physiques pour lesquelles apparaissent les jets latéraux. À cet effet, nous mettons en oeuvre une analyse de stabilité linéaire non-modale de l'évolution non-linéaire et axisymétrique de l'anneau tourbillonnaire de Kelvin-Helmholtz qui se développe dans les jets ronds à faible masse volumique en réponse à l'instabilité primaire de Kelvin-Helmholtz. Cette analyse de stabilité est réalisée à l'aide du code académique dalsa qui a été adapté pour ce régime d'écoulement. L'utilisation d'une méthode d’optimisation directe-adjointe permet d'identifier la structure spatiale et l'évolution temporelle des perturbations tridimensionnelles qui maximisent leur gain d'énergie généralisée, ainsi que les mécanismes physiques sous-jacents et leur lien avec l'apparition des jets latéraux. En particulier, l'objectif est d'apporter de nouveaux éléments permettant de statuer entre les deux hypothèses proposées dans la littérature pour expliquer le mécanisme à l'origine des jets latéraux. La première proposée par Monkewitz & Pfizenmaier (1991) repose sur un mécanisme d'induction de vitesse par les tourbillons longitudinaux contra-rotatifs qui se développent dans les écoulement cisaillés à masse volumique constante. La seconde est basée sur le mécanisme de tri-dimensionalisation associé aux stries de vitesse longitudinale de signe opposé qui se développent de part et d'autre du point de stagnation hyperbolique dans la tresse identifiée par Lopez-Zazuetaet al. (2016) dans la couche de mélange plane à densité variable.L'étude numérique conduite dans cette thèse est conçue en lien étroit avec la campagne expérimentale visant à étudier la structure des jets latéraux dans un jet de mélange binaire hélium-air. Ainsi, les paramètres de l'étude numérique comme les nombres de Reynolds et d'Atwood ainsi que le rapport d'aspect du jet, sont basés sur les conditions expérimentales. Ceci permet une comparaison directe des résultats théoriques aux observations expérimentales. Pour ce faire, nous avons conduit une campagne de mesures d'anémométrie à fil chaud du profil radial de vitesse du jet, et de la fréquence de l'instabilité primaire, afin de le caractériser et de le placer dans le contexte de la littérature scientifique.L'objectif de l'approche expérimentale est d'analyser la structure des jets latéraux et le mélange qu'ils induisent. Nous avons ainsi conçu et assemblé un banc de Background Oriented Schlieren tomographique (3DBOS). Ce banc est conçu afin de pouvoir observer les déviations optiques de l'ordre de 0,5 mrad induites par le champ hétérogène d'indices de réfraction créé par le jet de mélange hélium-air. Les mesures de 3DBOS obtenues permettent de reconstruire les champs de masse volumique du jet à faible densité en présence de jets latéraux. Ces champs de masse volumique sont originaux dans la littérature scientifique sur le sujet, et permettent d'augmenter notre compréhension de la structure des jets latéraux et de leur impact sur le mélange, et ainsi de corroborer les prédictions issues de l'analyse de stabilité
The aim of this PhD thesis is to study the physical mechanisms which govern the evolution and the mixing of side-jets in low-density binary mixing round jets, using a complementary numerical and experimental approach. The physical mechanisms which are responsible for the generation of side-jets, closely related to the three-dimensionalisation of the jet through the development of secondary instabilities, are as of yet not fully understood. As such, a better understanding of the mechanisms at play is a prerequisite for the design of an efficient control strategy to promote the mixing between the jet and ambient fluid.The objective of the numerical study is to identify the transient mechanisms which influence the growth of three-dimensional disturbances in the low-density round jet, specifically under the physical conditions in which side-jets appear. To that aim, a linear non-modal stability analysis was conducted over the non-linear evolution of a two dimensional axisymmetric Kelvin-Helmholtz vortex ring which develops in low-density round jets due to the Kelvin-Helmholtz primary instability.The stability analysis was implemented through further numerical development of the existing dalsa academic code. Through the use of a direct-adjoint optimisation method, we identify the spatial structure and temporal evolution of three-dimensional disturbances which yield the highest growth of generalised energy, as well as the underlying physical mechanisms and their relation to side-jets generation in low-density round jets at low Atwood numbers. In particular, we seek to bring a new perspective in order to settle between the two current hypotheses concerning the physical mechanisms at the origin of side-jets. The first hypothesis suggested by Monkewitz & Pfizenmaier (1991) relies on a velocity induction mechanism induced by the longitudinal counter-rotating vortex dipoles developing in the constant-density case. The second one is based on the three-dimensionalisation mechanism associated with longitudinal velocity streaks of opposite sign developing on either side of the hyperbolic stagnation point in the braid identified by Lopez-Zazueta et al. (2016) in the case of variable-density plane mixing layers.The numerical analysis is conducted in close relation to an experimental investigation of the structure of side-jets in a helium-air binary mixture round jet. The parameters used in the numerical analysis, such as the Reynolds number, the Atwood number and jet aspect ratio, are based on the operating conditions used in the experiment, allowing the theoretical predictions to be compared with the empirical evolution of the helium-air jet. To that aim, we conduct hot-wire anemometry measurements of the jet radial profile and frequency of the primary instability under several operating conditions to characterise the evolution of the governing parameters and relate the experimental conditions to the existing scientific literature.The objective of the experimental investigation is to study the structure of side-jets and their effect on the mixing of the jet and ambient fluids. To do so, we have designed and assembled a tomographic Background Oriented Schlieren (3DBOS) experimental bench. This bench is designed to observe the deviations of light-rays of the order of 0.5 mrad induced by the change in refractive index in the helium-air jet. The 3DBOS technique employed in this study provides novel reconstructions of three-dimensional density maps of the side-jets which develop over the helium-air jet. Through these novel density maps, we can provide new insight into the structure of side-jets and their induced mixing, and relate them to the predictions of the stability analysis
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5

Bakulu, Natungadio Florian. "Analyse et modélisation de la dynamique de jets décollés en tuyère supersonique". Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2019. http://www.theses.fr/2019ESMA0020.

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Cette thèse, menée en collaboration entre le CNES et l’institut Pprime, a pour objectif d’améliorer la compréhension des phénomènes dynamiques présents dans les jets des tuyères supersoniques de fusée. Ces phénomènes peuvent être à l’origine de charges latérales pouvant endommager la tuyère.L’étude s’est concentrée sur une géométrie de tuyère idéale et sur 3 points de fonctionnement.Les travaux sont basés sur l’exploitation et l’analyse de données expérimentales et numériques.Les données expérimentales proviennent d’une campagne réalisée au sein de l’Institut Pprime comportant des mesures de pression pariétales synchronisées avec des mesures de champs de vitesse par PIV. En complément, une partie numérique consistant à reproduire les essais expérimentaux à l’aide de simulations numériques hautes performances basées sur des approches hybrides RANS/LES est réalisée.Une organisation particulière des fluctuations de pression pariétale vue dans certains travaux dont l’origine reste méconnue est retrouvée dans les données expérimentales et numériques. L’étude montre que cette organisation est aussi présente dans le champ de vitesse du jet où des liens avec la pression pariétale ont été établis par des calculs de corrélation. Les simulations numériques montrent qu’une telle coordination du champ de pression pilote la dynamique des efforts latéraux.Certains scénarios sur l’origine de cette fluctuation organisée sont écartés grâce au recours à des modèles réduits de l’écoulement
This thesis, conducted in collaboration with CNES and Pprime Institut, has the objective of enhancing the dynamic phenomena understanding present in supersonic rocket nozzle. These phenomena may cause lateral loads that can damage the nozzle.The study focused on an ideal nozzle geometry and 3 operating points. The work is based on the exploitation and analysis of experimental and numerical data. The experimental data come from a campaign carried out within the Pprime Institute involving measurements of wall pressure synchronized with measurements of velocity fields by PIV. In addition, a numerical part reproducing the experimental tests using high-performance numerical simulations based on hybrid RANS/LES approaches is carried out.The experimental and numerical data show a particular organization of the wall pressure fluctuations observed in some work whose origin remains unknown. The study shows that this organisation is also present in the velocity field of the jet where links with wall pressure have been established by correlation calculations. Numerical simulations show that such a coordination of the pressure field drives the lateral force dynamics. Some scenarios on the origin of this organised fluctuation are discarded by the use of reduced flow models
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6

Piquet, Arthur. "Analyse physique et simulation numérique des phénomènes de décollement de jet dans les tuyères supersoniques". Thesis, Normandie, 2017. http://www.theses.fr/2017NORMIR09/document.

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Cette thèse, initiée par un programme de coopération franco-britannique entre la DGA et la DSTL, est consacrée à l’étude des phénomènes de décollement de jet au sein des tuyères propulsives sur-détendu. L’aérothermodynamique des systèmes propulsifs (missile, avion supersonique ou lanceur) est un des domaines de la mécanique des fluides où des progrès décisifs restent à réaliser pour améliorer les performances des ensembles moteurs, en terme de bilan de poussée, de stabilité, de fiabilité et de réduction de nuisances (bruit, émission de polluants, etc.). Les conditions de vols et la complexité des phénomènes caractéristiques n’étant pas reproductibles sur bancs d’essais à l’aide des outils expérimentaux actuelles, l’utilisation de simulation numérique permettrait une étude approfondie et précise des phénomènes mis en jeu. Le besoin d’informations concernant l’instationnarité de l’écoulement s’affirmant de plus en plus, notamment sur les phénomènes basse fréquence dû aux décollements de jets, l’utilisation des simulations numériques aux grandes échelles (LES) permettrait de faire face au coût prohibitif des simulations directes (DNS). Les tuyères sur-détendu souffrent de charges latérales, caractérisées par des forces instationnaires orthogonales à la direction de l’écoulement. Ils sont causés par le décollement de la couche limite se développant le long de la paroi, provoquant des excursions de chocs importants, parfois asymétrique. Ces phénomènes instationnaires ont déjà été observés expérimentalement et numériquement. Ces instationnarités émergent d’une combinaison de phénomène complexe, tels que les interactions choc/couche limite sur la paroi de la tuyère, les couches de mélange décollées ou les zones de recirculation en aval du décollement, toutes produisant des modes énergétiques à différente fréquence caractéristique et tout particulièrement dans la plage de basse fréquence. Capturer le phénomène de décollement est un véritable défi dû à la nécessité de résoudre plusieurs échelles spatiales et temporelles. L’utilisation des simulations directes (DNS) ou résolu proche paroi (WR-LES) devient difficile compte tenu des ressources en calcul numérique actuelles. Pour parer ce problème, l’utilisation d’une stratégie de modélisation proche paroi est nécessaire. Le modèle de paroi développé par Kawai & Larsson (2013) est intégré à la simulation LES, combiné au modèle de viscosité de Duprat et al. (2011) afin de tenir compte des gradients de pression rencontré tout au long de la tuyère. Le développement d’un code curviligne a également permis de réduire le coût de calcul des simulations cylindriques en utilisant un maillage raffiné proche paroi. Les résultats obtenus à partir des simulations modélisés (WM-LES) permettent de bien mettre en évidence les phénomènes d’instationnarité menant au problème de charge latérale. Le coût de calcul étant réduit de 40 fois comparé à une simulation résolu proche paroi WR-LES, la production d’une base de donnée basse fréquence devient possible. La comparaison des calculs modélisés aux calculs résolus et aux données expérimentales confirme la bonne implémentation du modèle pour des simulations LES de tuyère propulsive. La caractérisation des différents phénomènes est faite à l’aide d’analyses spectrales effectuées sur la base de donnée permettant de mettre en avant le phénomène basse fréquence rencontré dans les tuyères sur-détendu
The present thesis, sponsored by a Franco-British cooperation program between the DGA and the DSTL, is devoted to the study of separation phenomenon in over-expanded nozzle. The aerothermodynamic of propulsion systems (missile, supersonic aircraft or launcher) is one the fields of fluid mechanics where important progress remains to be made in order to improve the performance of the engine, in terms of thrust, stability, reliability and pollutant (noise reduction, pollutant emissions, etc.). Since the flight conditions and the complexity of the characteristic phenomena are not reproducible on experimental benches, the use of numerical simulation would allow a thorough and precise study of the phenomena involved. The instationnarity observed in the separation of the boundary layer is becoming a main concern nowadays, especially the low-frequency phenomenon observed in some experiments, the use of large scale simulations (LES) would fit perfectly the computational power allocated on supercomputer compared to the prohibitive cost of direct simulations (DNS). Over-expanded nozzles are known to suffer from side loads, characterized by undesired unsteady forces orthogonal to the flow direction. They are caused by boundary-layer separation that causes significant and asymmetrical shock excursions within the nozzle. These phenomena have been studied experimentally and numerically. They emerge from a combination of complex unsteady flow phenomena, not yet fully understood, such as shock/boundary-layer interactions at the nozzle walls, detached mixing layers, and large regions of recirculating flow, all producing energetic motions at frequencies one or two orders of magnitudes lower than the characteristic frequency of the incoming turbulence. Capturing the phenomenon is a real challenge due to the need to resolve at least four decades of time scales, from the energetic scales of the incoming turbulence. This makes both direct (DNS) and wall-resolved large-eddy simulations (WR-LES) rather impractical. Instead, a wall-modelled LES (WM-LES) strategy is employed here, following the approach of Kawai & Larsson (2013) together with the eddy-viscosity modification of Duprat et al. (2011) so as to account for pressure gradients. The WM-LES is found to accurately reproduce the flow topology, as well as the spectral content obtained by a reference WR-LES. The development of a curvilinear code has allowed us to decrease the cost of computation of the simulations by using a stretched mesh close to the wall. The results obtained from the wall-modeled simulations (WM-LES) allowed us to capture and study the phenomena of instationnarity leading to the problem of side-loads. The WM-LES being about 40 times cheaper, the low-frequency motions may be statistically converged, enabling the study of the very low frequencies. The comparison of the modeled simulations with the resolved simulations and the experimental data confirms the good implementation of the model for LES computations of over-expanded nozzle flow. The characterization of the different phenomena is done through spectral analyses, carried out on the LES database allowing the highlight of the low-frequency phenomenon encountered in the over-expanded nozzle flow
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7

Min, Jiesheng. "Comportement transitionnel et stabilisation de flammes-jets non-prémélangés de méthane dans un coflow d’air dilué en CO2". Thesis, Rouen, INSA, 2011. http://www.theses.fr/2011ISAM0005/document.

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Ce travail s'intéresse à la compréhension du comportement des flammes non-prémélangées issues d'un jet de méthane assisté par un coflow d'air dilué avec du CO2, ou d'autres gaz chimiquement inertes pour discriminer les différents phénomènes impliqués dans la dilution. Les phénomènes transitionnels, décrochage et extinction, quantifiés par des limites de stabilité, sont analysés à l'aide de grandeurs physiques représentatives. Le domaine de stabilité de flamme est limité par des surfaces 3D dans le domaine physique ( Qdiluant/Qair (taux de dilution), Uair (vitesse d'air), UCH4 (vitesse de méthane)), révélant un effet compétitif entre l'aérodynamique et la dilution. Des cartographies génériques de décrochage et d'extinction communes à tous ces diluants sont proposées. Des grandeurs liées à la stabilisation sont toutes soumises à des lois d'évolution auto-simlilaires. Il en ressort que la vitesse de propagation de flamme est l'élément clé du mécanisme de stabilisation lors de la dilution
This work focuses on the understanding of the behaviours of non-premixed methane flame inside an air coflow diluted by carbon dyoxide (CO2) or by other chemically inert diluents in order to discriminate different phenomena involved in dilution. Transitional phenomena (liftoff and extinction) quantified trough the stability limits, are analyzed trough representative physical quantities. The flame stability domain is limited by 3D-surfaces (liftoff and extinction) in the physical domain (Qdiluant/Qair (dilution level), Uair (air velocity), UCH4 (methane velocity)) revealing a competitive effect between aerodynamics and dilution. Generic diagrams of flame liftoff and extinction are proposed for all the diluents. Physical quantities related to flame stabilization process are all submitted to, regardless of diluent, self-similar laws. This is explained by flame burning velocity which is considered as the key element in the flame stabilization mechanism with air-side dilution
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Libros sobre el tema "Side-Jets"

1

Rigney, Mark. Deaf side story: Deaf Sharks, hearing Jets, and a classic American musical. Washington, DC: Gallaudet University Press, 2004.

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Deaf side story: Deaf Sharks, hearing Jets, and a classic American musical. Washington, D.C: Gallaudet University Press, 2003.

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Rigney, Mark. Deaf Side Story: Deaf Sharks, Hearing Jets, and a Classic American Musical. Gallaudet University Press, 2003.

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Barrios, Richard. West Side Story: The Jets, the Sharks, and the Making of a Classic. Running Press, 2020.

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Barrios, Richard. West Side Story: The Jets, the Sharks, and the Making of a Classic. Running Press, 2020.

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West Side Story: The Jets, the Sharks, and the Making of a Classic. Running Press, 2020.

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Our story: Jets & Sharks : then and now. Denver, CO: Outskirts Press, 2011.

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Capítulos de libros sobre el tema "Side-Jets"

1

Abid, M. y M. E. Brachet. "Generation Of Side Jets In Forced Axisymmetric Jets". En Instabilities and Nonequilibrium Structures IV, 333–38. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1906-1_33.

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Jiang, X. y K. H. Luo. "Dynamics of Transitional Noncircular Buoyant Reactive Jets with Side-Wall Effects". En Direct and Large-Eddy Simulation IV, 189–96. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-1263-7_23.

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Pitts, William M. y Arthur W. Johnson. "Mixing Behavior of Absolutely Unstable Axisymmetric Shear Layers Forming Side Jets". En Fluid Mechanics and Its Applications, 17–24. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5474-1_3.

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Raghu, S., B. Lehmann y P. A. Monkewitz. "On the Mechanism of ‘Side-jet’ Generation in Periodically Excited Axisymmetric Jets". En Advances in Turbulence 3, 221–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-84399-0_25.

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Savary, C., B. Bertin, M. Lenaerts, I. El Ouamari y D. Bousmar. "Transverse Mooring Forces Due to Asymmetrical Filling in a Lock with Longitudinal Culverts and Side Ports". En Lecture Notes in Civil Engineering, 724–35. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_63.

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AbstractIn lock design, several geometries are proposed for the levelling system with the aim of insuring a smooth and fast levelling operation. For high and medium lift lock, longitudinal culverts with side ports located in the lock walls are often chosen because this system distribute the flow along the entire length of the lock chamber. Nevertheless, when one of the culvert (valve) is out of order, the flow is asymmetrical what induced significant transverse mooring forces, especially during filling operations.Field measurement on such a lock (225 m long, 25 m wide and 13.5 m lift) demonstrated transverse water slopes significantly larger than the admissible criteria during asymmetrical filling operation. Further investigations on a physical scale model highlighted the driving effect of the side port jets on the rolling flow. Detailed measurements were performed on the scale model covering: (1) water surface slope; (2) transverse velocity distribution; (3) transverse mooring forces and rolling angle of a vessel located in the lock chamber. It was concluded that the size of the outlets of the side ports has a major impact on the transverse forces. For smaller outlets at a given discharge, the flow velocity increases and more impulse is transferred to the rolling flow, resulting in larger forces on the vessel.
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Oyallon-Koloski, Jenny. "Agency, Control, and Space". En Storytelling in Motion, 56–88. Oxford University PressNew York, 2024. http://dx.doi.org/10.1093/oso/9780197602669.003.0004.

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Abstract West Side Story (1961) is a pivotal example of film musical form. Codirectors Jerome Robbins and Robert Wise use cinematic choreography and dance as powerful storytelling tools to illustrate the differences and similarities between the gangs of Sharks and Jets that fuel their escalating conflict. Despite a desire for narrative realism in portraying the tensions between the white and Latinx/o/a teenagers, West Side Story’s producers did not prioritize inclusive hiring practices in casting its Puerto Rican characters, and the film remains a multifaceted emblem of Hollywood’s patterns of cultural exclusion and essentialism. Those patterns of exclusion are also central to the narrative’s cinematic choreography. Emphasizing both the characters’ individuality and the importance of a collective cohesion, West Side Story uses cinematic choreography to show the Sharks’ and Jets’ mutual desire for their own space, while the Jets’ entitled dominance of their unwillingly shared environment demonstrates their violent resistance to change.
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Gennaro, Liza. "Taking the Reins". En Making Broadway Dance, 106–44. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190631093.003.0006.

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The genesis of the present-day director-choreographer, starting with de Mille’s role as director-choreographer on Rodgers and Hammerstein’s ill-fated Allegro (1947), is explored. How she employed dance as a narrative and metaphorical device in support of the allegorical structure of the libretto, and how her artistic vision conflicted with her collaborators is investigated. De Mille’s directorial oeuvre is considered in the context of the male-dominated world of Broadway. Robbins’ ascendance as the most influential director-choreographer of twentieth-century musical theater is examined in a close analysis of his choreography for and direction of Pajama Game (1954 [co-directed with George Abbott, co-choreographer Bob Fosse]), Peter Pan (1954), Bells Are Ringing (1956 [in which he collaborated with Bob Fosse]), Gypsy (1959), and Fiddler on the Roof (1964). West Side Story (1957) will be discussed here as an anomaly in Robbins’ musical theater career. I argue that Robbins’ interest in movement innovation in relation to his choreography for the “Jets” in West Side Story (1957) differs from his previous musical theater works. In addition, I will examine Robbins’ West Side Story collaboration with co-choreographer Peter Gennaro.
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Godbold Jr., E. Stanly. "The Tightrope to Peace". En Jimmy and Rosalynn Carter, 222—C15.P53. Oxford University PressNew York, 2022. http://dx.doi.org/10.1093/oso/9780197581568.003.0016.

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Abstract This chapter considers Carters ongoing efforts to broker peace in the Middle East. In order to bring Menachem Begin and Anwar Sadat together at Camp David to negotiate a peace agreement, Carter had to understand each personality and the needs of each nation, convince Jewish-American voters that he was on their side, and balance the US relationship with Arab countries for economic and national security reasons. When he sold F-15 fights jets to Saudi Arabia, Senator Abraham Ribicoff held a closed door meeting with Jewish members of the Senate to convince them that Carter would always keep Israel better armed than its Arab enemies. The chapter also considers problems at home, where he had to deal with Senator Ted Kennedy’s opposition to his national healthcare bill, which weakened Carter’s position in the Democratic party. In addition, although the United States had given asylum to famed Soviet novelist Alexander Solzhenitsyn, the Russian novelist made a powerful speech condemning the degradation of values in the hedonistic and wasteful West. Rosalynn Carter intended to answer him, and did so by defending the progress that the United States had made during the Carter administration.
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Heller, Joseph. "Johnson, Israel and the Cold War: testing the Memorandum of Understanding (1965–67)". En The United States, the Soviet Union and the Arab-Israeli Conflict, 1948-67. Manchester University Press, 2016. http://dx.doi.org/10.7228/manchester/9781526103826.003.0014.

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The Memorandum of Understanding was not as clear-cut commitment. America was still trying to limit its political and military implications by conditioning the supply of tanks and jetfighters on an Israeli promise not to be the first to be the aggressor or introduce nuclear weapons into the region. Israel had no difficulty in agreeing to jses demands, but the dynamics of the Arab-Israel conflict could not allow it to become subservient to American patronage without a security guarantee. The PLO terrorist acts, the rise of the neo-Ba’ath in Syria, and Nasser’s growing offensive in the Arab states and Africa signified a new era which required strengthening Israel’s deterrence. That could not be ignored by the US, and the supply of Skyhawk jets and Patton tanks was ensured. The Vietnam war created a dilemma for the US in its relations with Israel, since American Jews did not support Johnson on the Vietnam issue, but did support Israel. Israel however had to be careful and not side with America in view of Israel’s delicate relations with the Third World, and the need not to irritate the USSR while hoping for a change in the fate of Soviet Jews.
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Actas de conferencias sobre el tema "Side-Jets"

1

Tinklenberg, Amy, Bryan Tierney y David J. Forliti. "The Structure of Side Jets in Globally-Unstable Round and Elliptical Jets". En AIAA Scitech 2019 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-1876.

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Orrala, Carlos y Hamid Rahai. "Experimental Investigations of Two Side-by-Side Jets in a Cross Flow". En 42nd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-1109.

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Bunsirisert, Kelvin, Carlos Orrala y Hamid Rahai. "Profiles of Two Elevated Side-by-Side Turbulent Jets in a Cross Flow". En 43rd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-1062.

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Phan, Andy, Khalil Kairouz, Carlos Orrala y Hamid Rahai. "Profiles of Two Side-by-Side Jets with Different Momentum Ratios in a Cross Flow". En 35th AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-5155.

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Cao, Yu-chun y Zheng-wei Wang. "Research on Combustion Characteristics of a Jet Flame With Penetration of Side Micro-Jets". En ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASMEDC, 2011. http://dx.doi.org/10.1115/power2011-55440.

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Nowadays as clean energy gas is being got more widely utilization in the industrial fields, such as the industrial boilers and kilns. How to improve the combustion performance, including the high efficiency and low pollution emission of the gas flame, is becoming the hot topic for the combustion researchers. In this paper, an innovative jet flame with side micro-jets has been proposed and its effects on the flame structure and its performance have also been investigated. Due to the changes of the initial combustion conditions, mixing and aerodynamics which results from the perturbation of the side micro-jets, such a lifted jet flame have different flame structure compared with the common premixed flame. Results show that use of the micro-jets can control, to a certain extent, the flame structure, including the flame length, lift-off distance and blow-off limit. With the same fuel and air flow rate, the flame length with the side micro-jets will decrease about 5%–40% as the air volume ratio a increases from 58%–76%. Compared with the common diffusion flame, such a jet flame demonstrates to be easier to be momentum-dominated flame. The flame length with 2 micro-jets is about 5% less than with 6 micro-jets under the same fuel and air flow rate. With the same α, the fewer number of the controlled jets lead to the flame with relatively shorter length, not easier to be blown off and higher NOx emission. With certain fuel flow rate, the critical air volume ratio is largest for the flame with 3 micro-jets, which is more difficult to be blown off than the cases with 2, 4 or 6 micro-jets.
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Kaneda, Yasuhiro y Akinori Muramatsu. "Effects on Momentum Thickness and Density Ratio for Side-Jet Formation in Round Jets With Variable-Density". En ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-21004.

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If the mass density of an issuing gas is sufficiently lower than that of the ambient gas, radial ejections of the jet gas may be generated near the nozzle exit. These radial ejections are referred to as side jets. The parameters for side-jet formation have been reported to be the density ratio of the jet gas and the ambient gas and the momentum thickness at the nozzle exit. In the present experimental study, gases with variable density were discharged into still air. Two round nozzles having different area contraction ratios were used in order to vary the momentum thickness. The momentum thicknesses were obtained after the velocity profiles at the nozzle exit were measured by a hot-wire probe and a hot-wire concentration probe for jets with various density ratios and issuing velocities. The existence of side jets was confirmed by flow visualization of the jets using a laser sheet. The domain for side-jet formation is illustrated using the non-dimensional momentum thickness and the density ratio.
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Zhenchao, Wang, Yang Lingyu, Zhang Jing y Shen Gongzhang. "Integer programming based optimal side jets ignition combination for advanced missile attitude control". En 2014 26th Chinese Control And Decision Conference (CCDC). IEEE, 2014. http://dx.doi.org/10.1109/ccdc.2014.6852833.

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Kobayashi, Nobuhiro, Koichi Nishibe, Yusuke Watabe, Kotaro Sato y Kazuhiko Yokota. "Study on Flow Around a Rectangular Cylinder With an Asymmetric Slot for Synthetic Jets". En ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7647.

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Several recent studies have examined the fundamental behavior of synthetic jets as substitutes for continuous jets [1–4]. In addition, attempts to control fluid machines with synthetic jets have also begun [5, 6]. However, little attention has been given to the effects of an asymmetric flow field on the behavior of synthetic jets [7, 8]. There have been few reports on the influence of a large-scale asymmetric boundary on the motion of synthetic jets [7]. In this study, an attempt was made to describe the flow around a rectangular cylinder with an asymmetric slot for synthetic jets. The main results are as follows: (1) the continuous jets proceed toward the nearest rigid wall by the Coanda effect independently of the slot geometry (with/without beak), (2) when the nondimensional stroke of the synthetic jets is large, the flow patterns are similar to those of continuous jets, (3) when the nondimensional stroke is small and the rectangular cylinder is placed near the wall opposite the side of the beak, the synthetic jets turn to the upstream direction under the present range of conditions, and (4) the flow rate in the duct depends on the non-dimensional stroke length when the rectangular cylinder is placed near the wall opposite the side of the beak.
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Arai, Norio y Jun-Ho Hong. "Active control of aerodynamic forces by inhalation side-jets - Freely vibrating square-section cylinder". En Fluids 2000 Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-2342.

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Bohn, Dieter E. y Karsten A. Kusterer. "Aerothermal Investigations of Mixing Flow Phenomena in Case of Radially Inclined Ejection Holes at the Leading Edge". En ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-198.

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A leading edge cooling configuration is investigated numerically by application of a 3-D conjugate fluid flow and heat transfer solver, CHT-Flow. The code has been developed at the Institute of Steam and Gas Turbines, Aachen University of Technology. It works on the basis of an implicit finite volume method combined with a multi-block technique. The cooling configuration is an axial turbine blade cascade with leading edge ejection through two rows of cooling holes. The rows are located in the vicinity of the stagnation line, one row is on the suction side, the other row is on the pressure side. The cooling holes have a radial ejection angle of 45°. This configuration has been investigated experimentally by other authors and the results have been documented as a test case for numerical calculations of ejection flow phenomena. The numerical domain includes the internal cooling fluid supply, the radially inclined holes and the complete external flow field of the turbine vane in a high resolution grid. Periodic boundary conditions have been used in the radial direction. Thus, end wall effects have been excluded. The numerical investigations focus on the aerothermal mixing process in the cooling jets and the impact on the temperature distribution on the blade surface. The radial ejection angles lead to a fully three dimensional and asymmetric jet flow field. Within a secondary flow analysis it can be shown that complex vortex systems are formed in the ejection holes and in the cooling fluid jets. The secondary flow fields include asymmetric kidney vortex systems with one dominating vortex on the back side of the jets. The numerical and experimental data show a good agreement concerning the vortex development. The phenomena on the suction side and the pressure side are principally the same. It can be found that the jets are barely touching the blade surface as the dominating vortex transports hot gas under the jets. Thus, the cooling efficiency is reduced.
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