Relevant bibliographies by topics / Labyrinthe radial

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Labyrinthe radial'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Labyrinthe radial"

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Rhode, David L., and Richard G. Adams. "Rub-Groove Width and Depth Effects on Flow Predictions for Straight-Through Labyrinth Seals." Journal of Tribology 126, no. 4 (2004): 781–87. http://dx.doi.org/10.1115/1.1760555.

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A fully compressible, two-dimensional axisymmetric, turbulent Navier-Stokes code using the finite-volume discretization approach was utilized to obtain an enhanced understanding of the effects of rub-grooves in straight-through, abradable labyrinth seals. The high-Re form of the k-ε turbulence model was used. The code was first validated against measurements of straight-through honeycomb labyrinths, and accurate results were obtained. It was found that in most of the cases considered (tooth tip outside of its rub groove), the presence of rub-grooves increases the leakage, except for the case o
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Soto, E. A., and D. W. Childs. "Experimental Rotordynamic Coefficient Results for (a) a Labyrinth Seal With and Without Shunt Injection and (b) a Honeycomb Seal." Journal of Engineering for Gas Turbines and Power 121, no. 1 (1999): 153–59. http://dx.doi.org/10.1115/1.2816303.

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Centrifugal compressors are increasingly required to operate at higher pressures, speeds, and fluid density. In these conditions, compressors are susceptible to rotordynamic instabilities. To remedy this situation, labyrinth seals have sometimes been modified by using shunt injection. In shunt injection, the gas is taken from the diffuser or discharge volute and injected into an upstream chamber of the balance-piston labyrinth seal. The injection direction can be radial or against rotation. This study contains the first measured rotordynamic data for labyrinth seals with shunt injection. A com
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Čížek, Michal, Zdeněk Pátek, and Tomáš Vampola. "Aircraft Turbine Engine Labyrinth Seal CFD Sensitivity Analysis." Applied Sciences 10, no. 19 (2020): 6830. http://dx.doi.org/10.3390/app10196830.

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This article presents the labyrinth seal radial clearance influence. A generic labyrinth seal of a turbine aircraft engine was modeled. The target is to compare and analyze the influence of the radial clearance and location of teeth. The results can be useful for designing the location of teeth and their appropriate setting, especially for materials engineering and engineering technology in general.
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Čížek, Michal, and Zdeněk Pátek. "ON CFD INVESTIGATION OF RADIAL CLEARANCE OF LABYRINTH SEALS OF A TURBINE ENGINE." Acta Polytechnica 60, no. 1 (2020): 38–48. http://dx.doi.org/10.14311/ap.2020.60.0038.

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Fluid flow in labyrinth seals of a turbine engine is described. The aim is to describe numerical calculations of fluid flow in labyrinth seals and evaluate the calculated data for different settings of radial clearance of labyrinth seals. The results are achieved by 3D CFD detailed simulations in a typical seal geometry. The calculations are performed for different radial clearances at a constant pressure drop. The calculated data are evaluated based on mass flow, static pressure, total enthalpy and total temperature of air. Based on the calculated data, it is visible, that the total temperatu
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Das, Saurav, and Hoong Thiam Toh. "Mechanical Growth of Labyrinth Seal." Applied Mechanics and Materials 465-466 (December 2013): 578–81. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.578.

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A preliminary numerical study has been conducted to study the effect of rotational speed on centrifugal growth in a six-tooth straight labyrinth seal. The distribution of the radial deformation along the seal axis for the rotational speed ranging from 100 rpm to 1500 rpm is reported in this paper. The radial deformation which decreases the clearance between the rotating and stationary parts of sealing surface is an indication that centrifugal growth occurs. The results of the simulation indicate that centrifugal growth increases as rotational speed increases. This finding is in qualitative agr
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Guelich, J., W. Jud, and S. F. Hughes. "Review of Parameters Influencing Hydraulic Forces on Centrifugal Impellers." Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering 201, no. 3 (1987): 163–74. http://dx.doi.org/10.1243/pime_proc_1987_201_021_02.

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Both radial and axial hydraulic forces act on the impeller of a centrifugal pump. The radial forces are due to three different mechanisms: (a) radial thrust due to non-uniform pressure distribution around the impeller, (b) labyrinth forces and (c) impeller-diffuser interaction forces. The nature, size and origin of these forces are discussed. Steady radial thrust depends on the specific speed of the pump, type of casing (single or double volute, diffuser), geometric parameters and operation conditions including cavitation. The impact of these factors on radial loads is demonstrated and quantit
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Szulc, Przemyslaw. "The Application of CFD Methods to Analyse the Flow Structures in the Radial Labyrinth Pump." Applied Mechanics and Materials 630 (September 2014): 52–60. http://dx.doi.org/10.4028/www.scientific.net/amm.630.52.

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The radial labyrinth pump consists of two discs: passive and active. Both discs are equipped in special blades with the opposite angle of milling. The passive disc is motionless and the active one rotates around the axis of the pump. On the surface of the connection of two blades belonging to different discs the circulation of fluid, as a type of energy conversion is expected. To investigate the analysed set of discs and take into consideration the impact of some structural changes of the geometry of both discs on a pump performance the numerical simulations were made. In this paper the result
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Liu, L. Y., J. Y. Li, and X. J. Yin. "Experimental Study on the Performance of Constrained Damped Rail Vibration Reduction." Noise & Vibration Worldwide 42, no. 10 (2011): 9–14. http://dx.doi.org/10.1260/0957-4565.42.10.9.

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To study the vibration reduction performance of damped rail, we take the standard rail and labyrinth constrained damped rail as the study target. By testing the vibration performance of both standard rail and labyrinth constrained damped rail in an anechoic room, we use the time-domain analysis to study the vibration changes with time passing. The results showed that: the labyrinth constrained damped rail vibration can effectively reduce the vibration amplitude and duration. Under the radial impact load, compared to the standard rail, vibration acceleration attenuation of the labyrinth constra
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LIU, Xingwang. "Research on the Radial Labyrinth of Scroll Compressor." Journal of Mechanical Engineering 48, no. 21 (2012): 97. http://dx.doi.org/10.3901/jme.2012.21.097.

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KANEMORI, Yuji, and Yasuo HANDA. "Influence of radial labyrinth seal on pump performance." Transactions of the JSME (in Japanese) 86, no. 887 (2020): 19–00408. http://dx.doi.org/10.1299/transjsme.19-00408.

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Dissertations / Theses on the topic "Labyrinthe radial"

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Lalonde, Christian. "Implication des récepteurs D¦2 dans la tâche de labyrinthe radial win-stay chez le rat." Master's thesis, Université Laval, 1998. http://hdl.handle.net/20.500.11794/42249.

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Une injection intrastriatale de l'agoniste D2 quinpirole facilite l'apprentissage de la tâche de labyrinthe radial win-stay (Packard et White, 1991). Trois expériences sont effectuées pour approfondir l'étude de l'implication des récepteurs dopaminergiques D2 dans ce type l'apprentissage et aussi pour vérifier l'impact de cet effet sur l'expression du proto-oncogène c-fos. Dans la première étude nous parvenons à répliquer l'effet facilitateur du quinpirole mais il comporte des faiblesses et nous reprenons la procédure dans une deuxième étude. Dans cette deuxième étude un groupe supplémentaire
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Allen, Kevin. "Contributions de l'hippocampe et du subiculum dans des versions proximale et distale de la tâche de labyrinthe radial chez le rat." Master's thesis, Université Laval, 2003. http://hdl.handle.net/20.500.11794/44451.

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Les études réalisées chez des patients amnésiques et chez les modèles animaux cérébro-lésionnels suggèrent que la formation hippocampique joue un rôle important dans la mémoire et l’apprentissage. Chez le rat, l’hippocampe semble particulièrement impliqué dans les tâches de mémoire spatiale. Toutefois, d’autres expériences montrent que la fonction de l’hippocampe varie selon certaines caractéristiques des stimuli à mémoriser, indépendamment de la dimension spatiale. Afin de tester cette dernière proposition, les travaux empiriques présentés dans ce mémoire évaluent, dans la tâche indicée du la
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Brayda-Bruno, Laurent. "Etude des déficits de mémoire relationnelle/déclarative au cours du vieillissement chez la souris : approche systémique." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14120/document.

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Cette thèse s’inscrit dans la thématique de l’identification des bases neurobiologiques du déclin de la mémoire déclarative (MD) lié au vieillissement. Deux difficultés principales sont à noter : 1) la modélisation animale de la MD, mémoire typiquement humaine et 2) le manque d’intégration des différents niveaux d’analyse du fonctionnement cérébral. Nos travaux ont contribué à résoudre ces deux problèmes par le développement d’un modèle murin du déclin de MD lié au vieillissement, associé une approche d’imagerie fonctionnelle de l’expression de la protéine Fos. Une première série de résultats
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Missaire, Mégane. "Oubli, sommeil et plasticité synaptique : une approche électrophysiologique in vivo chez le rat." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1187.

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L'oubli est une perte temporaire ou permanente de mémoire, que l'on perçoit souvent de manière déplaisante lorsqu'elle nous empêche d'accéder à un savoir que l'on a acquis. Cependant, des découvertes récentes suggèrent que l'oubli peut aussi être un processus adaptatif permettant d'optimiser notre mémoire, en effaçant des informations non pertinentes susceptibles d'interférer avec le stockage ou le rappel de nouvelles informations. Ainsi, l'oubli adaptatif est particulièrement essentiel au fonctionnement de notre mémoire à court terme ou mémoire de travail (MT), car les informations qui y sont
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Joseph, Mickael. "Reference memory, working memory and adaptive forgetting : a comparative study in rats." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10296/document.

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Depuis de nombreuses années, les scientifiques ont étudié les bases neurales de la mémoire. Cependant, une question clé demeure: comment le cerveau distingue t'il les informations suffisamment importantes pour être consolidées en mémoire à long terme des informations stockées de manière temporaire en mémoire à court-terme/mémoire de travail, et qui doivent être effacées afin de ne pas saturer nos ressources cognitives. Contrairement à l'opinion populaire qui considère l'oubli comme nuisible à notre mémoire, de nombreux travaux suggèrent que l'oubli est un processus adaptatif essentiel permetta
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Majdic, Franc. "Comparison of spool radial grooves influence between water and oil hydraulics." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199629.

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In this paper numerical flow calculations with respect to the annular gaps with added radial grooves normaly used on the spools of directional control valves were carried out. The impact of various annular gap geometries and radial grooves during variable pressure conditions, and while using different hydraulic fluids, on the flows through annular gaps were investigated for different flow regimes. Samples with different geometries and numbers of radial groves on the spool of the directional control valve were also made for the purpose of carrying out flow measurements. The two different hydrau
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Allen, Kevin. "Contributions de l'hippocampe et du subiculum dans des versions proximale et distale de la tâche de labyrinthe radial chez le rat /." 2003. http://proquest.umi.com/pqdweb?did=766707491&sid=1&Fmt=2&clientId=9268&RQT=309&VName=PQD.

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Böhm, Detlef. "Phänotypische und molekulare Analyse einer Maus mit Insertionsmutation und axonaler Reorganisation im Hippocampus." Doctoral thesis, 2001. http://hdl.handle.net/11858/00-1735-0000-0006-ABEB-C.

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Books on the topic "Labyrinthe radial"

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illustrator, Neely Scott, ed. The mystery of the maze monster. Curious Fox, 2014.

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illustrator, Neely Scott, ed. The mystery of the maze monster. Stone Arch Books, 2014.

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Book chapters on the topic "Labyrinthe radial"

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Cottaar, Michiel. "Dynamics and Multiplicity of Young Star Clusters: Getting the Most Out of Single Epoch Radial Velocity Data." In The Labyrinth of Star Formation. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-03041-8_91.

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"The Labyrinth of Memory." In Radical Treatment. MQUP, 2020. http://dx.doi.org/10.2307/j.ctvw1d7dg.18.

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Peterson, John. "6. Policy Networks." In European Integration Theory. Oxford University Press, 2009. http://dx.doi.org/10.1093/hepl/9780199226092.003.0006.

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This chapter examines the policy network approach to the analysis of European governance. The European Union has three primary features that lend itself to policy network analysis: the formidable power of the European Parliament (EP), EU’s status as an extraordinarily ‘differentiated polity’, and the fact that EU policy-making is underpinned by a complex labyrinth of committees that shape policy options before policies are ‘set’ by overtly political decisionmakers such as the EP. The chapter first traces the origins of policy network analysis before explaining the importance of policy networks for European integration. It then considers a host of criticisms levelled against policy network analysis and the application of the approach to Eurojust and the European Judicial Network. It also shows how policy network analysis might help us to shed light on the EU after its radical enlargement and concludes by reflecting on the future of policy network analysis.
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Johnson, George. "Explanatory Writing." In A Field Guide for Science Writers. Oxford University Press, 2005. http://dx.doi.org/10.1093/oso/9780195174991.003.0026.

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I remember with some precision when I began believing that there is nothing so complex that a reasonably intelligent person cannot comprehend it. It was a summer day, when I was 15 or 16, and my best friend, Ron Light, and I decided that we wanted to understand how a guitar amplifier works. We both played in a mediocre I96os-era garage band. While Ron went on to become a fairly accomplished guitarist, I was slowly learning that any talent I had didn't lie within the realm of music. Already the aspiring little scientist, I was able to learn enough of the logic of basic harmony theory to execute the mindlessly simple algorithms called bass riffs, and if pressed I could even fire off a bass solo, the dread of concertgoers everywhere. But my approach to the performance was purely intellectual. I didn't have rhythm, or maybe soul. Poring over the symbols on the circuit diagram of Ron's Fender Deluxe Reverb amplifier seemed infinitely more interesting than trying to read music. I wanted to know what that impressively convoluted blueprint really meant, how electricity flowing through the labyrinth of wires and components could cause the tiny vibration of a guitar string to be multiplied so many times that it rocked the walls of the living room, inciting the neighbors to call the police. This was still the era of the vacuum tube, before those glowing glass envelopes were replaced by coldly efficient transistors and microchips. Electronics was pretty simple to understand. I had already learned some basics from The Boys' Second Book of Radio and Electronics and the guide for the Boy Scout electricity merit badge (the colorful embroidered patch was decorated with a human fist clutching zigzag lightning bolts). In a typical circuit, there were resistors that, true to their calling, resisted electricity, pinching the flow of electrons. There were capacitors, also aptly named, that stored electrical charges. There were tightly wound coils of copper wire called inductors that would hold energy in the form of electromagnetic fields. Finally, there were the vacuum tubes themselves, mysterious pockets of illuminated nothingness inside of which the actual amplification took place.
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Conference papers on the topic "Labyrinthe radial"

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Subramanian, Sivakumar, A. S. Sekhar, and B. V. S. S. S. Prasad. "Performance Analysis of a Rotating Labyrinth Seal With Radial Growth." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95708.

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A computational methodology is proposed to predict the running clearance of a six-tooth straight-through rotating labyrinth seal numerically by taking into account both the centrifugal and thermal growths. Four different angular velocities ranging from 0 to 3000 rad/s are chosen to study the influence of rotation on the leakage flow rate. The detailed leakage flow fields and the structural deformations are presented. Further, different pressure ratios in the range of 1.1 to 2.5 have been investigated for a wide range of initial clearances. The methodology is validated against the available dat
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Deo, Hrishikesh, and Xiaoqing Zheng. "Flexure Design for Progressive Clearance Labyrinth Seal." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-71536.

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Turbo-machinery sealing is a challenging problem due to the varying clearances caused by thermal transients, vibrations or bearing lift–off. Conventional labyrinth seals have to be assembled with large clearances to avoid rubbing during rotor transients and this results in large leakage and lower efficiency. In our previous work, we have proposed a Progressive Clearance Labyrinth Seal which is mounted on flexures and employs progressively tighter teeth from the upstream to the downstream direction. The clearance progression gives rise to a feedback phenomenon whereby a small tip-clearance is m
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Soto A., Elias A., and Dara W. Childs. "Experimental Rotordynamic Coefficient Results for: (a) A Labyrinth Seal With and Without Shunt Injection and (b) A Honeycomb Seal." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-008.

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Centrifugal compressors are increasingly required to operate at higher pressures, speeds, and fluid density. In these conditions, compressors are susceptible to rotordynamic instabilities. To remedy this situation, labyrinth seals have sometimes been modified by using shunt injection. In shunt injection, the gas is taken from the diffuser or discharge volute and injected into an upstream chamber of the balance-piston labyrinth seal. The injection direction can be radial or against rotation. This study contains the first measured rotordynamic data for labyrinth seals with shunt injection. A com
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Dai, Xinbo, and Xin Yan. "Effects of Labyrinth Fin Wear on Aerodynamic Performance of Turbine Stages: Part II — Mushrooming Damages." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90153.

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Abstract The main function of labyrinth seal is to control leakage flow in clearance that involves with rotating and stationary parts. Therefore, the effective of clearance gap in labyrinth seal is critical to sealing, heat transfer and vibration characteristics. However, due to the mechanical expansions, vibrations, thermal stress, misalignment of seal components in transient periods of startup, shutdown and hot restart, the stationary and rotating parts of the labyrinth seal are likely to contact each other, causing wear damages in labyrinth fin. Mushrooming damages are often occurred in the
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Wei, Yuan, Zhaobo Chen, and Earl H. Dowell. "CFD Analysis of Aerodynamic Coefficients in Labyrinth Brush Seal." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50556.

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The aerodynamic force between a bristle pack and a rotor should be considered in order to predict the stability of a rotor brush seal system. The high pressure flow region in a brush seal makes the interaction of bristle pack, leakage flow and rotor complicated. It provides a challenge to the study of rotor brush seal system dynamic characteristics. To analyze the rotordynamic coefficients of a rotor brush seal system, a 3D CFD rotor labyrinth brush seal computational model was created using Reynolds-averaged Navier-Stokes (RANS) solutions coupled with a non-Darcian porous medium model. The re
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Arthur, Stephen P., and Dara W. Childs. "Measured Rotordynamic and Leakage Characteristics of a Tooth-on-Rotor Labyrinth Seal With Comparisons to a Tooth-on-Stator Labyrinth Seal and Predictions." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43242.

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Rotordynamic and leakage data are presented for a see-through tooth-on-rotor (TOR) labyrinth seal with comparisons to a see-through tooth-on-stator (TOS) labyrinth seal. Measurements for both seals are also compared to predictions from XLLaby. Both seals have identical diameter and can be considered as relatively long labyrinth seals. The TOR seal has a length-to-diameter ratio of 0.62, whereas the TOS seal is longer and has a length-to-diameter ratio of 0.75. Both seals also differ by number of teeth, tooth height, and tooth cavity length. TOR labyrinth tests were carried out at an inlet pres
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Pugachev, Alexander O., Manuel Gaszner, Christos Georgakis, and Paul Cooper. "Segmentation Effects on Brush Seal Leakage and Rotordynamic Coefficients." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42332.

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This paper studies the effect of brush seal segmentation on the seal performance characteristics. A brush-labyrinth sealing configuration arranged of one brush seal downstream and two labyrinth fins upstream is studied experimentally and theoretically. The studied brush seal is of welded design installed with zero cold radial clearance. The brush seal front and back rings as well as the bristle pack are segmented radially in a single plane using the electrical discharge machining technique. The segmentation procedure results in loss of bristles at the site of the cuts altering the leakage flow
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Pfau, A., A. I. Kalfas, and R. S. Abhari. "Making Use of Labyrinth Interaction Flow." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53797.

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It is the aim of this publication to attract the designers attention to the end wall flow interactions of shrouded high pressure turbines. One of the key issue for designing better turbines is the understanding of the flow interactions set up by the presence of labyrinth seals. Those interaction flows are carefully examined in this publication using the control volume analysis and the radial equilibrium of forces acting on streamlines. The consequences on secondary flow development and mixing losses are discussed and quantified. Out of this insight, design recommendations are derived, which at
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Chougule, Hasham, Abhay Naik, and Mohd Qizar. "Labyrinth Seal With Variable Height Teeth Tips for Efficient Leakage Control." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2561.

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Abstract A modification of a conventional straight tooth labyrinth seal with variable tooth height is proposed. The baseline and modified labyrinth seal teeth with solid land are examined by three-dimensional CFD numerical modeling of the flow field and evaluated for predicting the leakage through the seal during the engine operation. Stocker’s [1] static labyrinth seal experimental data is used to validate the CFD methodology used in this paper. The baseline and the proposed modified design [2] — “Labyrinth seal with variable tooth heights” are numerically studied with solid lands and evaluat
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Innocenti, Luca, Stefania Ricupero, Rajeev Kumar Pandit, and Nuo Sheng. "Experimental Analysis of Abradable Labyrinth Seal Leakage With Simulated Groove: Part 2." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95646.

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In the secondary flow path of centrifugal compressors, abradable seals are in high demand when higher efficiency is the main requirement. This is because abradable seals can maintain very tight clearances between static and rotating components compared to other sealing technology. However, due to the rubbing of the teeth into the abradable material, some grooves can form. The flow physics and mass leakage of abradable seals are strongly dependent on the presence of these grooves and their shape. For cases where no grooves are present, seal leakage is mainly a function of inlet pressure, pressu
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