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Relevant bibliographies by topics / Instabilité de cavitation

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Academic literature on the topic 'Instabilité de cavitation'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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Journal articles on the topic "Instabilité de cavitation"

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Cui, Baoling, and Jie Chen. "Visual experiment and numerical simulation of cavitation instability in a high-speed inducer." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 4 (2019): 470–80. http://dx.doi.org/10.1177/0957650919867173.

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Cavitation instabilities in a high-speed inducer at a design flow rate were investigated for different cavitation numbers in numerical simulations and visual experiments. On the basis of a shear stress transport k–ω turbulence model and Zwart–Gerber–Belamri cavitation model, the transient cavitating flow in a high-speed centrifugal pump with an inducer is numerically simulated using ANSYS-CFX 15.0 software. Visual experiments were carried out to capture the evolution of cavitating flow in the inducer by using a high-speed camera. The performance and cavitation characteristic curves from numeri

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Brennen, Christopher E. "Multifrequency Instability of Cavitating Inducers." Journal of Fluids Engineering 129, no. 6 (2006): 731–36. http://dx.doi.org/10.1115/1.2734238.

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Recent testing of high-speed cavitating turbopump inducers has revealed the existence of more complex instabilities than the previously recognized cavitating surge and rotating cavitation. This paper explores one such instability that is uncovered by considering the effect of a downstream asymmetry, such as a volute on a rotating disturbance similar to (but not identical to) that which occurs in rotating cavitation. The analysis uncovers a new instability that may be of particular concern because it occurs at cavitation numbers well above those at which conventional surge and rotating cavitati

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Li, Hong, Zhenhua Shen, Nicholas Engen Pedersen, and Christian Brix Jacobsen. "Experimental and unsteady numerical research of a high-specific-speed pump for part-load cavitation instability." Advances in Mechanical Engineering 11, no. 3 (2019): 168781401982893. http://dx.doi.org/10.1177/1687814019828932.

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Net positive suction head peak is a well-known cavitation instability phenomenon in high-specific-speed pumps. Both non-cavitating performance and cavitating performance of a high-specific-speed pump were investigated by experiments and numerical simulations. According to the cavitating performance results, net positive suction head peak is found at 80% of nominal flow. The head curves of non-cavitating performance also have saddle-type instabilities near 70%–80% of nominal flow. Water vapor volume fraction distributions show that cavitation region at net positive suction head peak flow only c

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Watanabe, Satoshi, and Christopher E. Brennen. "Dynamics of a Cavitating Propeller in a Water Tunnel." Journal of Fluids Engineering 125, no. 2 (2003): 283–92. http://dx.doi.org/10.1115/1.1524588.

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This study investigates the unsteady dynamics and inherent instabilities of a cavitating propeller operating in a water tunnel. First, the steady characteristics of the cavitating propeller such as the thrust coefficient are obtained by applying continuity and momentum equations to a simple one-dimensional flow tube model. The effects of the tunnel walls as well as those of the propeller operating conditions (advance ratio and cavitation number) are explored. Then the transfer matrix of the cavitating propeller (considered to be the most appropriate way to describe the dynamics of propeller) i

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DUTTWEILER, M. E., and C. E. BRENNEN. "Surge instability on a cavitating propeller." Journal of Fluid Mechanics 458 (May 10, 2002): 133–52. http://dx.doi.org/10.1017/s0022112002007784.

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This study details experiments investigating a previously unrecognized surge instability on a cavitating propeller in a water tunnel. The surge instability is explored through visual observation of the cavitation on the propeller blades and in the tip vortices. Similarities between the instability and previously documented cavitation phenomena are noted. Measurements of the radiated pressure are obtained, and the acoustic signature of the instability is identified. The magnitudes of the fluctuating pressures are very large, presumably capable of producing severe hull vibration on a ship.The or

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Dolgopolov, S. I. "Verification of a hydrodynamic model of a liquid-propellant rocket engine’s cavitating pumps using experimental and theoretical pump transfer matrices." Technical mechanics 2020, no. 3 (2020): 18–29. http://dx.doi.org/10.15407/itm2020.03.018.

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Cavities at the pump inlet may lead to inadmissible cavitation self-oscillations in the feed system of liquid-propellant rocket engines (LPREs) and to POGO instability if the oscillation frequency of the liquid is close to that of the rocket structure. Because of this, it is important to prevent both cavitation and POGO oscillations as early as at the engine and rocket design stage. This calls for a reliable mathematical model of the dynamics of LPRE cavitating pumps. In this paper, a hydrodynamic model of LPRE cavitating pumps is verified using theoretical and experimental transfer matrices o

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Zhang, Jing, Qin Wu, Hanzhe Zhang, Xingan Zhao, and Guoyu Wang. "Numerical investigation on cavitation instability and flow-induced vibration of liquid rocket engine inducer." Modern Physics Letters B 34, no. 15 (2020): 2050165. http://dx.doi.org/10.1142/s0217984920501651.

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The objective of this paper is to numerically investigate the unsteady cavitating flow around a four-blade inducer, with focus on the cavitation instability and the flow-induced vibration characteristics. In the numerical simulation, the modified rotation/curvature correction turbulence model and the Zwart cavitation model are used for the simulation of the flow field. The tightly coupled algorithm is adopted for the precise prediction of the fluid-structure interaction, including the calculation of the hydrodynamic loads based on the multiphase fluid dynamics and the computation of the struct

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Zhang, De-Sheng, Da-Zhi Pan, Hai-Yu Wang, and Wei-Dong Shi. "Numerical prediction of cavitating flow around a hydrofoil using pans and improved shear stress transport k-omega model." Thermal Science 19, no. 4 (2015): 1211–16. http://dx.doi.org/10.2298/tsci1504211z.

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The prediction accuracies of partially-averaged Navier-Stokes model and improved shear stress transport k-? turbulence model for simulating the unsteady cavitating flow around the hydrofoil were discussed in this paper. Numerical results show that the two turbulence models can effectively reproduce the cavitation evolution process. The numerical prediction for the cycle time of cavitation inception, development, detachment, and collapse agrees well with the experimental data. It is found that the vortex pair induced by the interaction between the re-entrant jet and mainstream is responsible fo

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Yoshida, Y., Y. Kazami, K. Nagaura, M. Shimagaki, Y. Iga, and T. Ikohagi. "Interaction between Uneven Cavity Length and Shaft Vibration at the Inception of Synchronous Rotating Cavitation." International Journal of Rotating Machinery 2008 (2008): 1–7. http://dx.doi.org/10.1155/2008/218978.

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Asymmetric cavitation is known as one type of the sources of cavitation induced vibration in turbomachinery. Cavity lengths are unequal on each blade under condition of synchronous rotating cavitation, which causes synchronous shaft vibration. To investigate the relationship of the cavity length, fluid force, and shaft vibration in a cavitating inducer with three blades, we observed the unevenness of cavity length at the inception of synchronous rotating cavitation. The fluid force generated by the unevenness of the cavity length was found to grow exponentially, and the amplitude of shaft vibr

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Gu, Wei, Yousheng He, and Tianqun Hu. "Transcritical Patterns of Cavitating Flow and Trends of Acoustic Level." Journal of Fluids Engineering 123, no. 4 (2001): 850–56. http://dx.doi.org/10.1115/1.1412233.

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Hydroacoustics of the transcritical cavitating flows on a NACA16012 hydrofoil at a 2/5/8-degree angle of attack and axisymmetric bodies with hemispherical and 45-degree conical headforms were studied, and the process of cloud cavitation shedding was observed by means of high-speed cinegraphy. By expressing the cavitation noise with partial acoustic level, it is found that the development of cavitation noise varies correspondingly with cavitation patterns. The instability of cavitation is a result of cavity-flow interaction, and is mainly affected by the liquid flow rather than by the cavitatio

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Dissertations / Theses on the topic "Instabilité de cavitation"

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Qu, An. "Experimental study of metastable solid and superfluid helium-4." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066052/document.

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L'hélium solide métastable est un candidat possible pour la supersolidité. Notre équipe a démontré en 2011 qu'on pouvait obtenir de l'hélium solide métastable à des pressions inférieures à la pression de fusion à l'aide d'une onde acoustique focalisée. Cependant, une instabilité inattendue apparaît lorsque la pression locale du crystal atteint 21 bar c'est à dire 4 bar sous la pression de fusion. J'ai donc commencé ma thèse en étudiant le temps d'apparition de l'instabilité, et j'ai confirmé qu'elle apparaît toujours dans des phases de décompression de l'onde sonore, c'est à dire à une pressio

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Guillet, Thibault. "Cavitation & Supercavitation : From a bluff to a stable streamlined projectile." Thesis, Institut polytechnique de Paris, 2019. http://www.theses.fr/2019IPPAX007.

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La supercavitation utilise le changement de phase du liquide-vapeur au mouvement rapide d'un projectile pour le profiler et ainsi réduire sa traînée. Dans cette thèse, nous abordons la supercavitation sous différents aspects : la cavitation induite par accélération en environnement confiné, la réduction de traînée engendrée par la cavité d'air et la stabilité des trajectoires des objets ainsi profilés. Plus précisément, nous nous intéressons dans un premier temps, à la fois expérimentalement et théoriquement, à la croissance des bulles de cavitation. Après avoir montré que cette croissance n'e

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Fouquet, Thomas. "Modélisation théorique et numérique de la saturation de l'instabilité de diffusion Raman stimulée se développant dans l'interaction laser-plasma." Phd thesis, Ecole Polytechnique X, 2007. http://pastel.archives-ouvertes.fr/pastel-00002323.

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Commençons par rappeler que l'objectif de la thèse était double : - numérique : il s'agissait de développer un code capable de simuler la saturation de l'instabilité de diﬀusion Raman stimulée (SRS) via le couplage avec les ondes acoustiques ioniques dans une description ﬂuide, en plasma homogène et inhomogène et en géométrie multidimensionnelle. La modélisation choisie est basée sur un système composé d'équations de type paraxiales pour les équations électromagnétiques et de type Zakharov pour les équations des ondes de Langmuir et des ondes sonores. Le problème a été traité dans un milieu ou

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Hou, Hang-sheng. "Cavitation instability in solids." Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/13697.

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Frikha, Sobhi. "Étude numérique et expérimentale des écoulements cavitants sur corps portants." Phd thesis, Paris, ENSAM, 2010. http://pastel.archives-ouvertes.fr/pastel-00544746.

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Le travail de thèse s'inscrit dans le cadre des travaux de recherche appliquée qui ont lieu au Laboratoire de Mécanique de Lille et à l'Institut de Recherche de l'Ecole Navale dans le domaine respectif des machines tournantes de type turbomachines ou celui des hélices marines et appendices de type surfaces portantes équipant les navires (stabilisateurs, safrans,...). L'objectif principal de la thèse est d'étudier les instabilités de cavitation. Pour cela, des simulations numériques associant des modèles de cavitation déjà existants sont mises en oeuvre et une comparaison de ces modèles est eff

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Bernardi, Jean de. "Aspects expérimentaux et théoriques des instabilités de cavitation dans les turbopompes de moteurs de fusée." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0217.

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Les instabilités hydrauliques et les efforts radiaux générés par la cavitation partielle sur un inducteur de turbopompe ont été étudiés en eau pour les inducteurs des turbopompes à hydrogène et à oxygène du moteur VULCAIN d’ARIANE 5. Nous avons pu établir une méthode d’identification et d’analyse des instabilités à l’aide de la synchronisation de films rapides avec des mesures d’effort, sur l’axe et avec des signaux de pression instationnaire en paroi. Des fréquences caractéristiques du phénomène de cavitation instationnaire ont alors été identifiées à différents points de fonctionnement. Cett

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Biasiori-Poulanges, Luc. "Fragmentation aérodynamique d’une goutte liquide induite par une onde de choc plane High-magnification shadowgraphy for the study of dropbreakup in a high-speed gas flow On the formation and recurrent shedding of ligaments in droplet aerobreakup Data on eosin y solutions for laser-induced fluorescence in water flows Multimodal imaging for intra-droplet gas-cavity observation during droplet fragmentation." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2021. http://www.theses.fr/2021ESMA0002.

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Ce travail de thèse propose une description originale de la fragmentation aérodynamique d’une goutte d’eau, induite par une onde de choc plane, pour des régimes à la frontière entre les modes gouvernés par l’instabilité de Rayleigh-Taylor et ceux dominés par l’instabilité de Kelvin-Helmholtz. Un banc expérimental composé d’un tube à choc couplé à des diagnostics d’imagerie rapide est exploité pour caractériser les processus de fragmentation. Les résultats expérimentaux sont complétés par des simulations numériques réalisées à partir du code multiphasique compressible open-source ECOGEN. L’effe

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Duttweiler, Mark Edward Brennen Christopher E. Brennen Christopher E. "Surge instability on a cavitating propeller /." Diss., Pasadena, Calif. : California Institute of Technology, 2001. http://resolver.caltech.edu/CaltechETD:etd-03262007-112838.

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Leroux, Jean-Baptiste. "Étude expérimentale en tunnel hydrodynamique des instabilités de la cavitation par poche sur hydrofoil par la mesure spatio-temporelle du champ de pression pariétal." Nantes, 2003. http://www.theses.fr/2003NANT2110.

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The thesis deals with partial attached cavitation instabilities. Most of the study is experimental. Experiments were carried in a water tunnel, on a partially cavitating hydrofoil. The experimental conditions ranged from sheet cavities inception to unstable cavities and cloud cavitation. In the latter case, instabilities are induced by the periodical development of a re-entrant jet under the cavity, which leads to the detachment of very erosive vapour clouds, which are convected in the cavity wake. In addition, such flows are noisy and cause structure's vibrations. Wall pressure measurements,

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Pagnier, Philippe. "Etude des instabilités de fonctionnement à débit partiel, de roues gavage (inducteurs) en alimentation de pompes centrifuges." Lyon, INSA, 1994. http://www.theses.fr/1994ISAL0111.

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Une roue de gavage, roue axiale placée a l'aspiration d'une roue centrifuge et montée sur le même arbre, permet de rendre les pompes plus performantes et plus compactes. L'inconvénient de ce type de roue est son comportement à débit partiel qui se manifeste par de violentes instabilités dont les conséquences peuvent être néfastes a la fois pour le circuit et pour la pompe. Après une étude des principes généraux de conception de l'inducteur, ce travail présente l'influence de cette roue sur les performances d'une roue centrifuge. Des visualisations de l'écoulement ont permis de décrire de maniè

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Book chapters on the topic "Instabilité de cavitation"

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Huang, Shehua, and Liangjun Cheng. "The Relation between Erosion Ripples on the Wetted Surface of Hydraulic Turbine and Instability Waves in the Turbulent Boundary Layer." In Hydraulic Machinery and Cavitation. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-010-9385-9_62.

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"Jetting of Viscous Single Droplets from Cavitation Induced Rayleigh-Taylor Instability." In Proceedings of the 10th International Symposium on Cavitation (CAV2018). ASME Press, 2018. http://dx.doi.org/10.1115/1.861851_ch124.

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Conference papers on the topic "Instabilité de cavitation"

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Shen, Zhenhua, Nicholas Pedersen, Hong Li, Christian Brix Jacobsen, and Xiaofen Ma. "Part-Load Cavitation Instability Investigation of a High Specific Speed Pump." In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69159.

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Cavitation instability in pump part-load condition is an ongoing subject of research due to erosion and noise. For some high specific speed (nq) pumps, NPSH3%-peak at part-load represents one of the cavitation instabilities. This paper describes the recent investigations and results on performance and cavitation instabilities of a high nq pump. An nq 99 impeller that shows a NPSH3%-peak at 70% of nominal flow rate is investigated by using numerical calculations and experiments. Both experimental and numerical results show that the head curves also have instability phenomenon near 70–80% of nom

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Sato, Keiichi, Naoya Takahashi, and Yasuhiro Sugimoto. "Effects of Diffuser Length on Cloud Cavitation in an Axisymmetrical Convergent-Divergent Nozzle." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-05507.

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Unsteady behavior of periodic cloud cavitation is typically observed in the field of fluid machinery under a high speed liquid flow such as a cavitating hydrofoil as well as cavitating water jet. The instability of cloud cavitation remains to be completely solved though it has been confirmed that there are two instabilities which is an intrinsic instability of cavitation and a system instability. Sato, et al. have found through previous investigations that the pressure wave at the collapse of shedding clouds can make a trigger to cause a reentrant motion. In the present study, the authors focu

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Watanabe, Hiroyoshi, and Hiroshi Tsukamoto. "Design Optimization of Cryogenic Pump Inducer Considering Suction Performance and Cavitation Instability." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-05010.

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This paper presents the result of design optimization for three-bladed pump inducer using a three-dimensional (3-D) inverse design approach, Computational Fluid Dynamics (CFD) and DoE (Design of Experiments) taking suction performance and cavitation instability into consideration. The parameters to control streamwise blade loading distribution and spanwise work (free vortex or non-free vortex) for inducer were chosen as design optimization variables for the inverse design approach. Cavitating and non-cavitating performances for inducers designed using the design variables arranged in the DoE t

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Hadavandi, Ruzbeh, Angelo Pasini, Dario Valentini, Giovanni Pace, and Luca d’Agostino. "Thermal Cavitation Instability Analysis in Axial Inducers by Means of Casing and Hub-Mounted Pressure Sensors." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5620.

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Abstract The effects of thermal cavitation on the flow instabilities developing in a three-bladed, tapered-hub, variable-pitch space turbopump inducer are described by illustrating the results of similarity experiments in water carried out at Sitael in the Cavitating Pump Rotordynamic Test Facility (CPRTF). The operating conditions have been varied as required for investigating the onset and response of the fluid dynamic instabilities occurring in the test inducer over a wide range of cavitation numbers from noncavitating to heavy cavitation conditions, both at design and off-design flow. The

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Danlos, Amélie, Christophe Sarraf, Jean-Elie Mehal, and Florent Ravelet. "Study of Passive Control Study of the Cavitation Instability on a Venturi Profile." In 8th International Symposium on Cavitation. Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2826-7_240.

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Pasini, Angelo, Lucio Torre, Angelo Cervone, and Luca d’Agostino. "Experimental Characterization of Thermal Cavitation Effects on Space Rocket Axial Inducers." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-06043.

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The paper shows the results of an experimental campaign conducted in the CPRTF (Cavitating Pump Rotordynamic Test Facility) at ALTA S.p.A., aimed at characterizing the cavitation thermal effects on two tapered-hub, variable-pitch inducers, designated as DAPAMITO. The semi-empirical method proposed by Ruggeri and Moore for scaling the thermal cavitation effects has been successfully applied and, consequently, a further validation of this method has been provided. The influence of the temperature on the intensity of the performance degradation associated with the attached cavitation instability

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Yoshida, Yoshiki, Masato Eguchi, Taiichi Motomura, Masaharu Uchiumi, Hirotaka Kure, and Yoshiyuki Maruta. "Rotordynamic Forces Acting on Three-Bladed Inducer Under Super-Synchronous/Synchronous Rotating Cavitation." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55135.

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Asymmetric cavitation, in which cavity lengths are unequal on each blade, is known as a source of cavitation induced shaft vibration in turbomachinery. To investigate the relationship of the uneven cavity length and rotordynamic force in a cavitating inducer with three blades, we conducted two experiments. In one, the growth of cavity unevenness at the inception of synchronous rotating cavitation in cryogenic flow was observed, and in the other, the rotordynamic fluid forces in water were examined by using a rotordynamic test stand with active magnetic bearings. Rotordynamic performances were

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Li, Hongchen, Jingzhu Wang, and Yiwei Wang. "Cavitation-Induced Interface Instability of Droplet Between Plates." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5360.

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Abstract Interface instability of droplet and formation of the liquid jet caused by internal volume oscillation are directly related to liquid pumping and mixing of microfluidic devices. Complex morphology jet enables liquid shaping, which is advantageous for industrial applications and biomedical engineering. In this study, the interface instability of cylindrical droplet between plates is investigated. The problem is analyzed through numerical simulation and experimentation. In the experiment, a single-pulse laser is used to generate cavitation at the center of the cylindrical droplet betwee

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Ahuja, Vineet, and Ashvin Hosangadi. "Simulations of Cavitation in Orifice and Venturis." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26639.

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Computational simulations can play an integral role in supporting testing and developmental activities by identifying and characterizing flow instabilities. However, the diversity of flow regimes and instability mechanisms place very stringent requirements on any computational framework that could be used for such analyses. For example, the identification of dominant frequencies associated with flow instabilities in such systems requires high order numerics, advanced turbulence modeling capabilities, sophisticated grid topologies to resolve local physics in complex geometries, embedded models

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Li Zhigang and Shu Xuefeng. "Cavitation instability in Valanis-Landel hyperelastic IC packaging material." In 2008 International Conference on Electronic Packaging Technology & High Density Packaging (ICEPT-HDP). IEEE, 2008. http://dx.doi.org/10.1109/icept.2008.4607127.

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Reports on the topic "Instabilité de cavitation"

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Buttler, William Tillman. FICH: Feature instability cavitation history. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1603958.

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