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Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 8 лютого 2022

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Статті в журналах з теми "High-speed liquid jet"

KATO, Takahisa, Nobushige TAMAKI, Masanori SHIMIZU, and Hiroyuki HIROYASU. "815 Atomization of High Speed Liquid Jet." Proceedings of Conference of Chugoku-Shikoku Branch 005.2 (2000): 261–62. http://dx.doi.org/10.1299/jsmecs.005.2.261.

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Shi, H. H., J. E. Field, and C. S. J. Pickles. "High Speed Liquid Impact Onto Wetted Solid Surfaces." Journal of Fluids Engineering 116, no. 2 (June 1, 1994): 345–48. http://dx.doi.org/10.1115/1.2910278.

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The mechanics of impact by a high-speed liquid jet onto a solid surface covered by a liquid layer is described. After the liquid jet contacts the liquid layer, a shock wave is generated, which moves toward the solid surface. The shock wave is followed by the liquid jet penetrating through the layer. The influence of the liquid layer on the side jetting and stress waves is studied. Damage sites on soda-lime glass, PMMA (polymethylmethacrylate) and aluminium show the role of shear failure and cracking and provide evidence for analyzing the impact pressure on the wetted solids and the spatial pressure distribution. The liquid layer reduces the high edge impact pressures, which occur on dry targets. On wetted targets, the pressure is distributed more uniformly. Despite the cushioning effect of liquid layers, in some cases, a liquid can enhance material damage during impact due to penetration and stressing of surface cracks.

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Arzate, A., and P. A. Tanguy. "Hydrodynamics of Liquid Jet Application in High-Speed Jet Coating." Chemical Engineering Research and Design 83, no. 2 (February 2005): 111–25. http://dx.doi.org/10.1205/cherd.04150.

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Kanemura, Takuji, Hiroo Kondo, Hirokazu Sugiura, Hiroshi Horiike, Nobuo Yamaoka, Tomohiro Furukawa, Mizuho Ida, Izuru Matsushita, and Kazuyuki Nakamura. "ICONE19-43608 DIAGNOSTICS OF HIGH-SPEED LIQUID LITHIUM JET FOR IFMIF/EVEDA LITHIUM TEST LOOP." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2011.19 (2011): _ICONE1943. http://dx.doi.org/10.1299/jsmeicone.2011.19._icone1943_246.

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Hiroyuki, Abe, Yoshida Kenji, Fukuhara Yuichi, and Kataoka Isao. "1014 MEASUREMENT OF LIQUID FRACTION DISTRIBUTION OF HIGH SPEED WATER JET BY LASER SHRIELEN METHOD." Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013): _1014–1_—_1014–6_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1014-1_.

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SHIMIZU, Masanori, Masataka ARAI, and Hiroyuki HIROYASU. "Disintegrating process of a high speed liquid jet." Transactions of the Japan Society of Mechanical Engineers Series B 54, no. 504 (1988): 2236–44. http://dx.doi.org/10.1299/kikaib.54.2236.

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Shi, Hong-Hui, Kazuyoshi Takayama, and Osamu Onodera. "Experimental Study of Pulsed High-Speed Liquid Jet." JSME International Journal Series B 36, no. 4 (1993): 620–27. http://dx.doi.org/10.1299/jsmeb.36.620.

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Hilbing, J. H., and Stephen D. Heister. "NONLINEAR SIMULATION OF A HIGH-SPEED, VISCOUS LIQUID JET." Atomization and Sprays 8, no. 2 (1998): 155–78. http://dx.doi.org/10.1615/atomizspr.v8.i2.20.

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Boiko, V. M., A. Yu Nesterov, and S. V. Poplavski. "Liquid atomization in a high-speed coaxial gas jet." Thermophysics and Aeromechanics 26, no. 3 (May 2019): 385–98. http://dx.doi.org/10.1134/s0869864319030077.

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Anufriev, I. S., E. Yu Shadrin, E. P. Kopyev, O. V. Sharypov, and V. V. Leschevich. "Liquid fuel spraying by a high-speed steam jet." Thermophysics and Aeromechanics 27, no. 4 (July 2020): 627–30. http://dx.doi.org/10.1134/s0869864320040162.

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Дисертації з теми "High-speed liquid jet"

Weiland, Christopher Jude. "Characteristics of the High Speed Gas-Liquid Interface." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/26150.

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The objective of this dissertation was to investigate physical characteristics of high speed gas-liquid interfaces for the cases of subsonic, transonic, and supersonic gas jets submerged underwater and the transient development of an underwater projectile reaching the supercavitating state. These studies are motivated by the need to understand the basic physics associated with a novel submersible missile launcher termed the Water Piercing Missile Launcher (WPML). This dissertation presents the first study of high speed round and rectangular gas jets submerged underwater utilizing a global optical measurement technique. This technique allows quantitative measurement of the entire gas jet and the interfacial motion. Experimental results indicate that the penetration of the gas jets into a quiescent liquid is strongly influenced by the injection mass flow and the nozzle geometry. In contrast, the oscillations of the interface are influenced by the injection Mach number. The transition from a momentum driven to a buoyant jet is determined using a characteristic length scale that appears to be in good agreement with experimental observations. Moreover, the unsteadiness of the interface appears to be governed by both Kevin-Helmholtz and Rayleigh-Taylor instabilities. This dissertation also contains the first study of a projectile accelerating to reach the supercavitating state. Experimental results show that the transient development of the supercavity is governed by the formation of a vortex ring. Nuclei are shed from the forebody of the accelerating projectile and are entrained in the vortex ring core where they are subjected to low pressure and subsequently expand rapidly. A characteristic time scale for this supercavity development is presented. Ph. D.

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Zakrzewski, Sam Mechanical &amp Manufacturing Engineering Faculty of Engineering UNSW. "A Numerical and Experimental Investigation of High-Speed Liquid Jets - Their Characteristics and Dynamics." Awarded by:University of New South Wales. Mechanical and Manufacturing Engineering, 2002. http://handle.unsw.edu.au/1959.4/18653.

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A comprehensive understanding of high-speed liquid jets is required for their introduction into engine and combustion applications. Their transient nature, short lifetime, unique characteristics and the inability to take many experimental readings, has inhibited this need. This study investigates the outflow of a high-speed liquid jet into quiescent atmospheric air. The key characteristics present are, a bow shock wave preceding the jet head, an enhanced mixing layer and the transient deformation of the liquid jet core. The outflow regime is studied in an experimental and numerical manner. In the experimental investigation, a high-speed liquid water jet is generated using the momentum exchange by impact method. The jet velocity is supersonic with respect to the impinged gaseous medium. The resulting jet speed is Mach 1.8. The jet is visualised with the use of shadowgraph apparatus. Visualisation takes place over a variety of time steps in the liquid jet???s life span and illustrates the four major development stages. The stages progress from initial rapid core jet expansion to jet stabilisation and characteristic uniform gradient formation. The visualisation shows that at all stages of the jet???s life it is axi-symmetric. One dimensional nozzle analysis and a clean bow shock wave indicate that the pulsing jet phenomenon can be ignored. In the numerical investigation, a time marching finite volume scheme is employed. The bow shock wave characteristics are studied with the use of a blunt body analogy. The jet at a specific time frame is considered a solid body. The jet shape is found to have an important influence on the shock position and shape. Analysis of the results indicates a shock stand-off similar to that seen in experimental observations and the prediction of shock data. The jet life span is modelled using a species dependent density model. The transient calculations reproduce the key jet shape characteristics shown in experimental visualisation. The mushrooming effect and large mixing layer are shown to develop. These effects are strongest when the shock wave transience has yet to stabilise. Quantitative analysis of the mixing layer at varying time steps is presented.

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Liu, Kaiyi. "Characterization and Control of an Electrospinning Process." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1355239985.

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Verdier, Antoine. "Experimental study of dilute spray combustion." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMIR27/document.

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La combustion diphasique implique de nombreux phénomènes physiques complexes, comprenant l'atomisation, la dispersion, l'évaporation et la combustion. Bien que la simulation numérique soit un outil performant pour aborder ces différentes interactions entre les phases liquides et gazeuses, la méthode doit être validée par des études expérimentales fiables. Par conséquent, des données expérimentales précises sur la structure de la flamme et sur les propriétés de la phase liquide et gazeuse le long des étapes d'évaporation et de combustion sont nécessaires. La complexité des configurations aéronautiques réelles implique d'étudier l'effet des propriétés locales sur la dynamique des flammes pour une configuration canonique. Ce travail, réalisé dans le cadre du projet ANR TIMBER, a pour objectif d'améliorer la compréhension de la combustion en flux diphasique, ainsi que de produire une base de données efficace et originale pour la validation des modèles utilisés dans les LES Liquid fuels are the primary energy source in a wide range of applications including industrial and residential furnaces, internal combustion engines and propulsion systems. Pollutant emission reduction is currently one of the major constraints for the design of the next generation combustion chamber. Spray combustion involves many complex physical phenomena including atomization, dispersion, evaporation and combustion, which generally take place simultaneously or within very small regions in the combustion chambers. Although numerical simulation is a valuable tool to tackle these different interactions between liquid and gas phases, the method needs to be validated through reliable experimental studies. Therefore, accurate experimental data on flame structure and on liquid and gas properties along the evaporation and combustion steps are needed and are still challenging. A joint effort between numerical and experimental teams is necessary to meet tomorrow's energy challenges and opportunities. The complexity of the real aeronautical configurations implies to study the effect of local properties in flame dynamics on a canonical configuration, which presents the essential feature of very well defined boundary conditions. This work, carried out within the framework of the ANR TIMBER project, aims to improve the understanding of two-phase flow combustion, as well as to produce an efficient and original database for the validation of the models used in LES

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Wu, Jong Shinn, and 吳忠信. "Stability Analysis of A High-Speed Liquid Jet." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/48099625317033426404.

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碩士 中原大學 機械工程研究所 81 The purpose of this paper is to investigate the instability of a high-speed liqud jet issued into a ambient compressible gas. Firstly, we list the conservative equations of mass and momentum with corresponding boundary conditions. The liquid is an incompressible inviscid fluid and the gas is assumed to be a compressible inviscid fluid. Here the system is subjected to axisymmetrical and asymmetrical disturbance. Secondly, we neglect the high order nonlinear terms by means of the linear theory. A characteristic dispersion equation that accounts for the growth of asymmetrical disturbing waves is then derived by considering a normal mode analysis. Finally, we use numerical method directly to find the solution, and the effects of the stability of a compressible gas can be estimated at high-speed liquid jet. The results show that in the subsonic region the instability is proportional to the value of the Mach number, Ma. Here the Mach number is the ratio of the inject speed of liquid to the sonic speed of the compressible gas . In the supersonic region the result is converse, i.e., the system is most unstable on Ma=1. The results also display that the compressibility of gas will make the liquid jet more unstable than that in the incompressibl case when Ma<Mam, where Mam denotes a certain Mach number in the supersonic region. The region of disturbance of sinuous wave is larger than that of dilational wave. We apply the Castleman's postulation to analyze the mechanism of atomization, and the results show that the radius of the drop is twice that at the low-speed liquid jet for the disturbance of dilational wave. It is a closed agreement between the results and the predictions from Rayleigh' s mathematical analysis. Excepting the transonic region, the fast liquid jet yields the larger radius of the drop for the disturbance of sinuous wave.

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Charng-Jyh, Wang, and 王長志. "ANumerical Analysis of the Growth of Unstable Waves fir High-speed Liquid Jet Atomization." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/13943476180565598536.

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碩士 國立海洋大學 機械與輪機工程學系 87 The high-speed jet atomization is a topic of practical applications, such as gas-turbine combustors, diesel engines, rocket thrust chambers, and spray coatings of protective materials on surface, etc. The liquid jet atomization is related with the unstable waves on the jet surface. The unstable growth rate of the surface wave is affected by initial jet velocity, liquid viscosity, liquid surface tension, liquid/gas density ratio, the difference between liquid and gas velocity, and the initial disturbance on the jet surface. In the present study, a cylindrical liquid jet issued from a nozzle at a constant velocity was considered in the cylindrical coordinate. The dispersion equations governing the temporal growth rates of the jet surface were derived from the continuity equation and the momentum equations with the small perturbation theory. The approximate and general solutions of the temporal dispersion equations were solved numerically. In the present numerical analyses, the jet parameters, such as liquid velocity, nozzle diameter, liquid viscosity, surface tension, liquid/gas density ratio and the difference between liquid and gas velocity, were varied to study their influences on the unstable wave growth rate. The present models were applied to several low-speed and high-speed jets. The numerical results showed that the trend of variations of the drop sizes and size distributions is in good agreement with the observation of past experimental studies. The present model also predicted that the surface wave growth rate is increased with increasing the jet velocity, and the wavelength of the surface wave with a maximum growth rate becomes shorter. This indicates that the higher the jet velocity the finer droplets are produced in the high-speed atomization process.

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Frommhold, Philipp Erhard. "Erzeugung und Untersuchung von schnellen Mikrotropfen für Reinigungsanwendungen." Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0022-6022-6.

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Seit mehr als einem Jahrhundert ist ein wachsendes wissenschaftliches Interesse an Tropfen und den Vorgängen bei deren Aufprall auf die verschiedensten Substrate zu verzeichnen, wohl auch durch die Fotografien von Worthington (1908) ausgelöst. Inzwischen wurden viele Erkenntnisse durch große Fortschritte bei der experimentellen Untersuchung (z.B. mittels Hochgeschwindigkeitsaufnahmen) und durch theoretische und computergestützte Untersuchung (z.B. durch skalenfreie und numerische Modellierung) gewonnen. Trotzdem bleibt durch die Vielfältigkeit und Komplexität der Phänomene während des Tropfenaufpralls sowie wegen der ständig erweiterten Anwendungsbereiche dieses Forschungsgebiet hochaktuell. Insbesondere sehr kleine und gleichzeitig sehr schnelle Tropfen (Tropfendurchmesser 10µm bis 100µm, Tropfengeschwindigkeit 10m/s bis 100m/s) kommen in vielen modernen Anwendungen vor (z.B. Verbrennungsmotoren, Tintenstrahldrucker, Reinigung von Oberflächen). In diesem wichtigen, aber für Untersuchungen schwer zugänglichen Parameterbereich gibt es immer noch offene Fragen. Die vorliegende Arbeit beschäftigt sich daher mit diesen schnellen Mikrotropfen in Bezug auf ihre Herstellung und den Aufprallvorgang auf ein festes, trockenes oder benetztes Substrat. Zunächst wird eine Methode zur Erzeugung eines Hochgeschwindigkeitssprays realisiert, welche auf dem durch Ultraschall gesteuerten Plateau-Rayleigh-Zerfall eines Flüssigkeitsstrahls beruht. Sie ermöglicht es, sowohl Tropfengröße als auch –geschwindigkeit präzise und mit hoher Reproduzierbarkeit über den gesamten oben angegebenen Parameterbereich einzustellen. Durch gezielte Manipulation eines Einzeltropfens durch elektrische Felder wird anschließend der Tropfenaufprall auf Substrate unterschiedlicher Benetzbarkeit mit sehr hoher zeitlicher Auflösung (ca. 100 Mio. Bilder pro Sekunde) bei gleichzeitig hoher räumlicher Auflösung (< 1µm) untersucht. Es zeigt sich, dass bekannte Modelle für langsamere und größere Tropfen im Millimeterbereich auch für schnelle Mikrotropfen Gültigkeit behalten. Somit ist bei gleichen dimensionslosen Kennzahlen (z.B. Reynolds-Zahl, Weber-Zahl, Ohnesorge-Zahl) eine skalenfreie Beschreibung des Tropfenaufpralls möglich. Schließlich wird die Methode zur Tropfenerzeugung auf einen für Anwendungen in der Reinigung relevanten Fall übertragen. Hierbei geht es um den Tropfenaufprall auf ein von einem Flüssigkeitsfilm überströmten Substrat. Es werden die während des Auftreffvorgangs auftretenden Geschwindigkeiten in der sich bildenden radialen Strömung in Abhängigkeit von verschiedenen Prozessparametern bestimmt. Aus den Ergebnissen lassen sich Aussagen über die zu erwartende Reinigungswirkung durch derartige Tropfen und den Einfluss der Prozessparameter treffen.

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陳天任. "Theoretical Analyses for the Atomization Model of High-speed Liquid Jets." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/80734973030606586596.

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碩士 國立臺灣海洋大學 機械與機電工程學系 98 The technology of the liquid jet atomization has been widely used in many industrial and technical applications. In various engine combustion chambers, atomized drop size, velocity distribution, and breakup length have profound influences on the combustion efficiency and emission pollution. Despite a great quantity of past experimental studies, the physical process of atomization phenomenon has not been fully understood. In the present study, based on the jet surface wave instability analysis on the interface of liquid and gas, the atomization model for the high-speed liquid jets was established and coupled with Jet Embedding Method and an annular ligament breakup model, which needs only economic adaptive grid system. Accordingly, the liquid jet core and drop formation in the atomization process can be numerically predicted. In the present study, the surface wave instability of high-speed liquid jets was first analyzed using the numerical method, including the influences of variations of jet velocity, gas/liquid density ratio, liquid viscosity and surface tension for high-speed liquid jets on growth rates of instable waves along the liquid jet surface. In the present study, the basic equations governing the flow field using Jet Embedding Method was set up and solved to determine the formation of the liquid jet core and the atomization on the liquid jet surface. Thus, drop formation can be established according to the annular ligament breakup model to predict the flow velocity, drop breakup rate, and drop size distribution. Finally, the atomization of water/air and JP-8 fuel oil/air ejected from a coaxial injector was numerically predicted, and evaluated by comparing with the CICM empirical correlation.

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Zakrzewski, Sam. "A numerical and experimental investigation of high-speed liquid jets : their characteristics and dynamics /." 2002. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20021108.042745/index.html.

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Частини книг з теми "High-speed liquid jet"

Iyengar, Venkat S., K. Sathiyamoorthy, J. Srinivas, P. Pratheesh Kumar, and P. Manjunath. "Measurements of Droplet Velocity Fields in Sprays from Liquid Jets Injected in High-Speed Crossflows Using PIV." In Proceedings of the National Aerospace Propulsion Conference, 93–102. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5039-3_5.

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Тези доповідей конференцій з теми "High-speed liquid jet"

Wang, Xiao-Liang, Hong-Hui Shi, Motoyuki Itoh, and Masami Kishimoto. "Flow visualization of high-speed pulsed-liquid jet." In 24th International Congress on High-Speed Photography and Photonics, edited by Kazuyoshi Takayama, Tsutomo Saito, Harald Kleine, and Eugene V. Timofeev. SPIE, 2001. http://dx.doi.org/10.1117/12.424250.

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Gong, Chen, Minguan Yang, Yuli Wang, Longlong Yan, and Bo Gao. "Turbulence Structure on the Surface of High Speed Liquid Jet." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-09512.

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The structures on the surface of high-speed capillary liquid jet were captured with the help of high-speed camera and microscope. A power spectral density method is used to deal with the jet images. Based on captured jet image, the variation of surface structures near the exit of the nozzle is divided into three sections: laminar section, instability section and turbulence section. There is no clearly surface structures in the laminar section. The wave-like structures come out in the instability section with a sudden and are regularly increase with a small slope along the streamwise. The degree of order is rather weak in the turbulence section. The increase of the Reynolds numbers which based on the momentum thickness at the exit of the nozzle will accelerates the jet surface transition from the laminar section to turbulence section.

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Stasicki, Boleslaw, Ales Charvat, Manfred Faubel, and Bernd Abel. "Visualization of laser-induced liquid micro-jet disintegration by means of high-speed video stroboscopy." In 26th International Congress on High-Speed Photography and Photonics, edited by Dennis L. Paisley, Stuart Kleinfelder, Donald R. Snyder, and Brian J. Thompson. SPIE, 2005. http://dx.doi.org/10.1117/12.567439.

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Bianchi, Gian Marco, Fabio Minelli, Ruben Scardovelli, and Stephan Zaleski. "3D Large Scale Simulation of the High-Speed Liquid Jet Atomization." In SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-0244.

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CHEN, T., C. SMITH, D. SCHOMMER, and A. NEJAD. "Multi-zone behavior of transverse liquid jet in high-speed flow." In 31st Aerospace Sciences Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-453.

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Mckeage, James W., Kieran A. Brennan, Geehoon Park, N. Catherine Hogan, Ian W. Hunter, Bryan P. Ruddy, Poul M. F. Nielsen, and Andrew J. Taberner. "High-speed X-ray analysis of liquid delivery during jet injection." In 2017 39th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2017. http://dx.doi.org/10.1109/embc.2017.8036821.

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Chakraborty, Arnab, and Srikrishna Sahu. "Liquid Atomization in a High-Speed Slinger Atomizer." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2616.

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Abstract The present research aims to investigate the liquid atomization process in a slinger atomizer test rig that houses a high-speed motor which allows high rotational speed of the slinger disc. Instead of delivering the liquid directly on the slinger disc, which is commonly reported in the literature, a stationary manifold was designed that receives the liquid from the pump and supply multiple liquid jets that impinge on the rotating slinger disc. The liquid jet breakup process was visualized using front light illumination technique. All experiments were performed using water as the working fluid and under atmospheric conditions. Four different water flow rates, ranging from 0.2 lpm up to 0.8 lpm were considered. The rotational speed of the slinger was varied from 5000 rpm up to 30000 rpm, which has been rarely reported in the past. The paper reports a comprehensive study on the differences in the liquid breakup modes due to higher liquid flow rate for the same rotational speed and vice-versa. Mostly the liquid was found to attach to the side of the slinger holes that is opposite to the direction of rotation indicating the strong influence of Coriolis forces on the liquid flow within the slinger and hence the atomization process. The droplet size in the spray was measured using the Interferometric Laser Imaging for Droplet Sizing (ILIDS) technique.

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Balasubramanyam, Madhanabharatam, and Chien Chen. "Finite Conductivity Evaporation Modeling of Liquid Jet in High-Speed Cross-Flow." In 45th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-833.

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Chandh, Aravind, Shivam Patel, Oleksandr Bibik, Subodh Adhikari, David Wu, Reza Rezvani, Dustin Davis, Tim Lieuwen, and Benjamin Emerson. "High Speed OH PLIF Measurements of Combustor Effusion Films in a High Pressure, Liquid Fueled Combustor." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59306.

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Abstract This paper presents measurements of 10 kHz OH planar laser induced fluorescence (PLIF) with an objective to study the interaction of effusion cooling with the flame and hot combustion products in the liquid fueled combustor. The combustor rig is a single sector representation a rich-burn/quick-quench/lean-burn (RQL) configuration. It consists of a swirl nozzle, dilution, and effusion jets. The rig is operated under realistic aircraft conditions, including elevated combustor inlet temperature, and elevated pressure. The PLIF laser sheet was arranged perpendicular and parallel to the liner at distinct liner locations. Parametric variations of important parameters, namely equivalence ratio, and effusion cooling air blowing ratio are conducted to investigate their effect on flame-effusion jet interactions. The PLIF images were analyzed using several data reduction techniques to de-noise the images and identify patterns in the effusion jet-flame interactions. Results show that the effusion jets are highly unsteady, interacting strongly with the turbulent flame from the swirl nozzle and the dilution jets. This work is an extension of recent effusion film mixing studies that were performed with acetone PLIF under non-reacting conditions.

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Bianchi, Gian Marco, Piero Pelloni, Stefano Toninel, Ruben Scardovelli, Anthony Leboissetier, and Stephan Zaleski. "A Quasi-Direct 3D Simulation of the Atomization of High-Speed Liquid Jets." In ASME 2005 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/ices2005-1067.

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In this paper a quasi-direct solution of transient three-dimensional CFD calculations based on a finite volume approach has been adopted to simulate the atomization process of high velocity liquid jets issuing an injector-like nozzle. An accurate Volume-of-Fluid (VOF) method is used to reconstruct and advect the interface between the liquid and gas phases. An extended mesh which includes the injector nozzle and the upstream plenum has been considered in order to investigate accurately the effect of nozzle flow conditions on the liquid jet atomization. Cavitation modeling has not been included in the present computations. Two different mean injection velocities, 150 m/s and 270 m/s, respectively, have been considered in the calculations as representative of semi-turbulent and fully-turbulent nozzle flow conditions. The liquid-to-gas density ratio is kept fixed at 57. The calculations show that atomisation is directly linked to the temporally and spatially correlated turbulence of the liquid jet. The bulk flow perturbation and the relaxation of the boundary layer have been found to be the basic mechanisms that generate surface perturbations of the liquid jet.

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