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Dissertations / Theses on the topic 'Labyrinth Seal'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Phibel, Richard. "A numerical investigation of labyrinth seal flutter." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/59973.

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This thesis investigates numerically the phenomenon of flutter in labyrinth seals. Computational fluid dynamics (CFD) methods are used to predict the fluid forces produced in the labyrinth when one of the seal members is vibrating in its natural mode. The geometry of the seal, the vibrational characteristics and the flow characteristics are varied to determine their influence on the aeroelastic stability. The CFD results are used to develop a bulk-flow model for labyrinth seal flutter analysis. An aeroelastic design procedure for labyrinth seal is pro-posed.

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2

Xu, Jinming. "Effects of operating damage of labyrinth seal on seal leakage and wheelspace hot gas ingress." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5867.

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The labyrinth seal is widely used in turbomachinery to minimize or control leakage between areas of different pressure. The present investigation numerically explored the effect of damage and wear of the labyrinth seal on the turbomachinery flow and temperature fields. Specifically, this work investigated: (1) the effect of rubgroove downstream wall angle on seal leakage, (2) the effect of tooth bending damage on the leakage, (3) the effect of tooth "ÃÂÃÂmushrooming"ÃÂÃÂ damage on seal leakage, and (4) the effect of rub-groove axial position and wall angle on gas turbine ingress heatin

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3

Gao, Rui. "Computational Fluid Dynamic and Rotordynamic Study on the Labyrinth Seal." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28134.

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The labyrinth seal is widely used in turbo machines to reduce leakage flow. The stability of the rotor is influenced by the labyrinth seal because of the driving forces generated in the seal. The working fluid usually has a circumferential velocity component before entering the seal; the ratio of circumferential velocity and shaft synchronous surface velocity is defined as pre-swirl rate. It has been observed that pre-swirl rate is an important factor affecting driving forces in the labyrinth seal thus affecting the stability of the rotor. Besides the pre-swirl, the eccentricity, the clearance

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4

Mehta, Rumeet Pradeep. "Labyrinth Seal Preprocessor and Post-Processor Design and Parametric Study." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32646.

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Vibrations caused due to aerodynamic excitation may cause severe limitation to the performance of turbomachines. The force resulting from the non-uniform pressure distribution within the labyrinth cavity is identified as a major source of this excitation. In order to perform rotor dynamic evaluation of rotor-bearing-seal system, accurate prediction of this force is essential. <p> A visual basic based front-end, for a labyrinth seal analysis program, has been designed herein. In order to accurately predict the excitation force, proper modeling of labyrinth leak path is important. Thus, the fr

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5

Xi, Jinxiang. "Seal inlet disturbance boundary conditions for rotordynamic models and influence of some off-design conditions on labyrinth rotordynamic instability." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4971.

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Systematic parametric studies were performed to better understand seal-inlet rotordynamics. A CFD-perturbation model was employed to compute the seal-inlet flow disturbance quantities. Seal inlet disturbance boundary condition correlations were proposed from the computed seal-inlet quantities using the important parameters. It was found that the cosine component of the seal-inlet swirl velocity disturbance W1C has a substantial impact on the cross-coupled stiffness, and that the correlations for W1C and W1S should be used to replace the historical guess that seal inlet W1C = 0 and W1S = 0. Als

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6

Choi, Dong Chun. "A novel isolation curtain to reduce turbine ingress heating and an advanced model for honeycomb labyrinth seals." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3799.

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A combination of 3-D and 2-D computational fluid dynamics (CFD) modeling as well as experimental testing of the labyrinth seal with hexagonal honeycomb cells on the stator wall was performed. For the 3-D and 2-D CFD models, the hexagonal honeycomb structure was modeled using the concept of the baffle (zero-thickness wall) and the simplified 2-D fin, respectively. The 3-D model showed that even a small axial change of the tooth (or honeycomb wall) location, or a small circumferential change of the honeycomb wall location significantly affected the flow patterns and leakage characteristics espec

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7

Konicki, Joseph S. "Design of a two dimensional planer pressurized air labyrinth seal test rig." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA277232.

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8

Williston, William C. "Rotordynamic effects driven by fluid forces from a geometrically imperfect labyrinth seal." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA276424.

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9

Al-Ghasem, Adnan Mahmoud. "Windback seal design for gas compressors: a numerical and experimental study." Texas A&M University, 2003. http://hdl.handle.net/1969.1/5740.

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Seals are considered one of the important flow elements of a turbomachinery device. Traditional labyrinth seals have proven their performance functionality by reducing leakage rates. Significant improvements on labyrinth seal functionality were obtained through altering the design geometry of labyrinth seals to prevent contamination across a seal and maintaining small leakage flowrates. This results in a windback seal that has only one tooth which continuously winds around the shaft like a screw thread. These seals are used in gas compressors to isolate the gas face seal from bearing oil. A pu

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10

TAURINO, ROBERTO. "ENERGY-EFFICIENT INNOVATIVE SEAL FOR AIRCRAFT ENGINES." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2681688.

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The development of new Additive Manufacturing techniques helps to overtake design constrains characterizing the standard processes. This new reality can opens the space to the redesign of more efficient aircraft engine components. The engine turbine labyrinth seal honeycomb land is currently obtained shaping and welding a sheet metal to create an hexagon pattern. The employing of the DMLM additive manufacturing could led to the development of new geometries, different from the standard honeycomb land, able to increase the labyrinth sealing performances. In this research, innovative stator pat

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11

Zhuang, Qingyuan. "Parametric Study on the Aeroelastic Stability of Rotor Seals." Thesis, KTH, Kraft- och värmeteknologi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-116689.

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Labyrinth seals are widely used in rotating machinery and have been shown to experience aeroelastic instabilities. The rapid development of computational fluid dynamics now provides a high fidelity approach for predicting the aeroelastic behavior of labyrinth seals in three dimension and exhibits great potential within industrial application, especially during the detailed design stages. In the current publication a time-marching unsteady Reynolds- averaged Navier-Stokes solver was employed to study the various historically identified parameters that have essential influence on the stability o

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12

Thompson, Elizabeth Danielle. "Study of Forces and Dynamic Coefficients in Whirling and Eccentric Labyrinth Seals Using ANSYS-CFX." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/32328.

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Labyrinth seal force estimates are important to the prediction of the stability of turbomachinery. The force prediction methods fall into several categories: experiments, bulk flow analysis, and finite volume analysis. Finite volume analysis can be split into two subcategories: self-developed and commercial. In this research, a commercial computational fluid dynamics (CFD) program called ANSYS-CFX was used to predict the forces generated in a labyrinth seal whirling at specified speeds. The results were compared to data from VT-FAST, a bulk flow code, and TASCflow, another commercial CFD p

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13

Holík, Petr. "Úcpávky turbodmychadel." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230162.

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This master’s thesis deals with theme of turbocharger seals. The aims of a thesis are to compare a turbocharger seals used in PBS Turbo turbochargers and to describe a testing of a seals. Principle of turbocharging and types of turbocharger are described in fist part. Next point of the thesis is describing of a face seals and non-contacting seals. The main part of the thesis describes kinds and reasons of seals testing; also contains comparison between labyrinth seals and piston ring, comparison of seals of PBS Turbo’s turbochargers and assesses the impact of turbocharger angle on the tightnes

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14

Millsaps, Knox Taylor. "The impact of unsteady swirling flow in a single gland labyrinth seal on rotordynamic stability : theory and experiment." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/43281.

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15

Dairien, Alexa. "Stabilité des écoulements et interaction fluide structure dans les joints labyrinthe." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC038.

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Des joints labyrinthes sont utilisés dans les turbopompes spatiales pour limiter les fuites du gaz qui entraine la turbine dans l’interstice séparant le rotor du stator. Les tendances actuelles sont à la minimisation des jeux (pour optimiser le rendement) et à l’allègement du stator. Ces contraintes conduisent à l’apparition d’instabilités qualifiées d’aéroélastique qui peuvent mener à l’endommagement des structures internes de la turbine, notamment au niveau des partie statoriques selon des analyses post-mortem. Ces évolutions rendent nécessaires l’élaboration de modèles plus prédictifs au ni

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16

Šnajdárek, Ladislav. "Přestup tepla v kanálech malých průřezů s rotující stěnou." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-403860.

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This work deals with the determination of the heat transfer coefficient in small channels with a rotating wall. The research part of the thesis is focused on specific geometry, namely labyrinth seals used in rotary machines. Existing criteria equations determining heat transfer coefficients and other parameters in these specific geometries are described. The central part describes the built experimental device for the determination of values of heat flows and heat transfer coefficients on both stator and rotor for given airflow and rotor speed. The following section is devoted to presenting th

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17

Fleury, Marine. "Étude expérimentale d’instabilités aéroélastiques de joints labyrinthe." Thesis, Lyon, 2021. http://www.theses.fr/2021LYSEC037.

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Dans les machines tournantes, les joints labyrinthes sont utilisés à plusieurs niveaux (turbine, compresseur) pour limiter les fuites et les phénomènes de recirculation entre les zones hautes pressions et les zones basses pressions. Ces composants sont donc critiques pour les performances du moteur. Ils opèrent sans contact, par perte de charge, en minimisant les jeux radiaux entre parties fixes et parties tournantes de la machine. De plus, l’épaisseur du stator est réduite pour obtenir des géométries légères. Ces contraintes de conception mènent à l’apparition d’instabilités aéroélastiques qu

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18

Delebarre, Corentin. "Etude expérimentale des systèmes d'étanchéité de type labyrinthe pour turbomachine par l'étude du contact grande vitesse." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0130.

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Une des solutions envisagées par les motoristes pour améliorer le rendement des turbomoteurs consiste à réduire le jeu en fonctionnement dans les deux systèmes d’air des turbomachines. Plus particulièrement dans le système d’étanchéité d’air secondaire, la réduction du jeu entre les parties fixes et tournantes améliore le contrôle des étanchéités du moteur et les niveaux de refroidissement entre les différents modules des turbomoteurs, mais entraînent des interactions indésirables entre les différents composants. Les systèmes d’étanchéité dynamiques sont composés de joints labyrinthes couplés

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19

Бага, Вадим Миколайович, Вадим Николаевич Бага та Vadym Mykolaiovych Baha. "Совершенствование методов расчета и проектирования лабиринтных уплотнений валов пневмоагрегатов на основе моделирования рабочего процесса". Thesis, Изд-во СумГУ, 2015. http://essuir.sumdu.edu.ua/handle/123456789/40851.

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У дисертаційній роботі виконано уточнення робочого процесу та методики розрахунку лабіринтних ущільнень, що дає можливість підвищити їх ефективність, надійність, економічність та термін служби. Одержані візуалізації течії, запропонований поелементний підхід до опису робочого процесу в ущільненні, що полягає в його розгляді як суми отворів з індивідуальними характеристиками. Цей підхід дав змогу встановити наявність аномальних явищ у проточній частині багатощілинного лабіринтного ущільнення у вигляді флуктуацій параметрів течії – одночасно існуючих зон із різними режимами вихрової течії. Отрим

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20

Belko, Milan. "Součinitele přestupu tepla na parou obtékaných plochách parních turbín." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230763.

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This thesis in introductory part aims to analyze the available literature on the heat transfer coefficient in labyrinth seals and rotating discs of steam turbines. The available experiment studies were processed to summarize heat transfer coefficients on the rotating parts of the turbine. Then, this thesis specifies a design calculation to determine the heat transfer coefficient in selected parts of the turbine, exercisable for specific geometric and operating parameters. The outcome of this work is simulation of rotor dilation of operating steam turbine in the program Ansys during cold start

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21

Skoupý, Pavel. "Parní turbina." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228802.

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The master´s thesis concentrates on a project of steam turbine with controlled extraction points destined for a communal waste incineration plant. First, there the history of devices using steam as a moving medium is introduced and than follows the description of computing program, where the calculation was running. The master´s thesis subject consists in the thermodynamic project of turbine vaning, in basic project of gearbox including the check calculations and in technical economic comparison of single shaft and twin shaft constructional design. The design documentation is worked up accordi

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22

Thevenot, Mael. "Contact à grande vitesse en zone labyrinthe, identification des phénomènes mécaniques et thermiques et du comportement des matériaux." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0010.

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La maitrise de l'étanchéité des systèmes d'air dans les turboréacteurs est améliorée en minimisant le jeu entre les pièces tournantes et le carter qui les entoure, garantissant un meilleur rendement du moteur. La réduction de ce jeu permet de diminuer les fuites aérodynamiques à travers le moteur, mais cela peut occasionner des contacts indésirables entre les pièces en rotation à haute vitesse et les pièces fixes en vis-à-vis. Les joints labyrinthes sont des systèmes d'étanchéité dont la partie fixe est revêtue d'un matériau abradable sacrificiel afin de limiter l'endommagement de la partie ro

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23

Беллауар, Абдеррахман. "Підвищення ефективності експлуатації компресорних станцій шляхом вдосконалення конструктивних елементів газоперекачувальних агрегатів". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2010. http://elar.nung.edu.ua/handle/123456789/1968.

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Робота присвячена питанням удосконалення конструкцій елементів газоперекачувальних агрегатів (ГПА) з відцентровим нагнітачем (ЦБН) компресорних станцій. Проаналізовані надійність ГПА, спосіб її підвищення і її зв'язок із залишковим ресурсом, а також вплив вібрації на технічний стан ГПА і можливості використання її для проведення діагностування і віброконтролю ГПА. Виявлено інформаційні показники, за якими можна визначити технічний стан ГПА; розроблено метод самоорганізації моделей і отримано рівняння регресії; створено тривимірну параметричну комп'ютерну модель ЛУ; складено програму упра

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24

Рапута, М. В. "Чисельне та експериментальне дослідження впливу шорсткості поверхні на характеристики лабіринтних ущільнень". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/72180.

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У роботі виконано чисельне та експериментальне дослідження впливу шорсткості поверхні на характеристики лабіринтних ущільнень<br>В работе выполнено численное и экспериментальное исследование влияния шероховатости поверхности на характеристики лабиринтных уплотнений.<br>A numerical and experimental study of the effect of surface roughness on the characteristics of labyrinth seals was performed.

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25

Khan, Mohammed Ajaz. "Leakage flow in labyrinth seals." Thesis, University of Bradford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.482781.

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26

Allcock, D. C. J. "Abradable stator gas turbine labyrinth seals." Thesis, Cranfield University, 1999. http://dspace.lib.cranfield.ac.uk/handle/1826/10702.

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This is a detailed study into the internal aerodynamics of labyrinth seals, with pmic| reference to the effects of abradable honeycomb stators on labyrinth seal leakage.- A extensive experimental programme established tables of friction factor for three different grades of honeycomb used by industry, and examined the effect of both Reynolds number and clearance on these friction factors. The friction factor associated with a aerodynamically smooth surface was also experimentally determined in order to establish the experimental method. The experimental data was used to model the different grad

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27

Collins, Dermot. "The effects of wear on abradable honeycomb labyrinth seals." Thesis, Cranfield University, 2007. http://hdl.handle.net/1826/1756.

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This thesis reports on work undertaken to understand the effects, due to wear, on the performance of abradable honeycomb labyrinth seals. The phenomena studied are aerodynamic in nature and include compressible flow, turbulent flow, recirculation and separation at a range of pressure ratios from 1.20 up to 3.50. Four primary methods of investigation were used: experimental, numerical using CFD, numerical using theoretical derivations and numerical using established labyrinth seal specific computer codes. Effects of seal clearance, pressure ratio and tooth to groove location have been investiga

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Gamal, Eldin Ahmed Mohamed. "Leakage and rotordynamic effects of pocket damper seals and see-through labyrinth seals." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85848.

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This dissertation discusses research on the leakage and rotordynamic characteristics of pocket damper seals (PDS) and see-through labyrinth seals, presents and evaluates models for labyrinth seal and PDS leakage and PDS force coefficients, and compares these seals to other annular gas seals. Low-pressure experimental results are used alongside previously-published high-pressure labyrinth and PDS data to evaluate the models. Effects of major seal design parameters; blade thickness, blade spacing, blade profile, and cavity depth; on seal leakage, as well as the effect of operating a seal in an o

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Joubert, Stephanus Lourens. "Mathematical modeling of leakage flow through labyrinth seals / Lourens Joubert." Thesis, North-West University, 2003. http://hdl.handle.net/10394/389.

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Optimization of gas turbine systems has identified the need for simplified mathematical models to calculate the losses experienced within turbo machines. One such loss is that of the flow through labyrinth seals. As part of a larger study, this study concentrates on the development of such loss models to aid in the performance prediction of turbo machines. The aim of this study was therefore firstly to understand the nature of labyrinth leakage flows and secondly to investigate mathematical models to calculate or predict such leakages through most common geometries. Finally the ability of thes

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Dai, Yushuang. "Large eddy simulation of labyrinth seals and rib shapes for internal cooling passges." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/271753.

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The turbine is one of the key components in gas turbine engines. To prevent the turbine blades from being badly damaged by their harsh working environment, it is necessary to keep them cool. This can be achieved by enhancement of the heat transfer performance through internal cooling passages. However, the large quantity of flow within this internal cycle inevitably results in mass flow loss, which is a major source of loss in turbomachinery. Therefore labyrinth seals are also investigated in this study, attempting to reduce the flow leakage and further increase the turbine efficiency. Large E

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Jin, Hanxiang. "Surface Patterning and Rotordynamic Response of Annular Pressure Seals Used in Turbomachinery." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/96731.

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Rotordynamic instability problems in turbomachinery have become more important in recent years due to rotordynamic components with higher speeds and higher power densities. These features typically lead to increased instability risk in rotor dynamic components as fluids-structure interactions take place. In addition, critical damage of rotordynamic components can result from high level vibrations of supporting bearing system, where the reduced rotor speed can lead to system operating near the rotor critical speed. Therefore, increased accuracy in modeling of rotordynamic components is required

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Flores, Diego [Verfasser], and Jörg [Akademischer Betreuer] Seume. "Influence of labyrinth seals in cavities on the flow of an axial compressor / Diego Flores ; Betreuer: Jörg Seume." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2018. http://d-nb.info/1168379962/34.

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Millsaps, Knox Taylor. "Analysis of aero-elastic forces in labyrinth seals and the design of an experimental facility to measure them." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/109622.

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Flores, Galindo Diego Rodrigo [Verfasser], and Jörg [Akademischer Betreuer] Seume. "Influence of labyrinth seals in cavities on the flow of an axial compressor / Diego Flores ; Betreuer: Jörg Seume." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2018. http://nbn-resolving.de/urn:nbn:de:101:1-2018100402081060711538.

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Бага, Вадим Миколайович, Вадим Николаевич Бага, Vadym Mykolaiovych Baha та Д. С. Мартиш. "Дослідження впливу масштабного фактору на характериститки лабіринтних ущільнень". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/62583.

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Бага, Вадим Миколайович, Вадим Николаевич Бага, Vadym Mykolaiovych Baha та О. І. Подоляка. "Підвищення ефективності лабіринтних ущільнень". Thesis, Сумський державний університет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/62584.

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В данній роботі проводилися чисельні дослідження із застосуванням гідродинамічного програмного комплексу FlowVision для розрахунку течії у вузьких осьових зазорах лабіринтного ущільнення, за результатами яких одержані нові дані по детальному дослідженню ущільнення з гладким валом.

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Вертепов, Юрий Михайлович, Юрій Михайлович Вертепов, Yurii Mykhailovych Vertepov та А. А. Кривошеев. "Исследование процесса всасывания жидкостнокольцевой машины". Thesis, Сумский государственный университет, 2017. http://essuir.sumdu.edu.ua/handle/123456789/62587.

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Жидкостно-кольцевая машина относится к объемным машинам с внутренним сжатием и принудительным осевым газораспределением через окна, поэтому формы окон во многом определяют ее характеристики. Объемная характеристики определяется правильной организацией процесса всасывания, для которого большое значение имеет форма внешней кромки всасывающего окна. С возрастанием отношения давлений коэффициент подачи машины быстро снижается. Наиболее заметно с возрастанием отношения давлений снижается коэффициент плотности, связанный с перетечками сжимаемого газа с нагнетания на всасывание через торцовые зазоры.

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Jelínek, Tomáš. "Oprava turbínové skříně." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-320107.

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This diploma thesis deals with the repair of a steam backpressure single-stage turbine. This thesis is assigned to a specific Spilling turbine case. A revisional report of this turbine with repair or exchange suggestions of demaged turbine parts is processed. In addition, a simulation of the contact pressure is carried out on the split plane of the housing. Structural modifications are designed and simulated to increase the parting plane's tightness. Further, the calculation of the tightening torque of the split plane is performed and a control thermodynamic and strength calculation of the lab

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Vítek, Tomáš. "Parní kondenzační turbína malého výkonu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400497.

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The goal of this Master’s thesis is to create the design of a low power condensing steam turbine. The turbine has a Curtis control stage and a reaction blading. The work also contains the calculation of gland labyrinth seals and the balancing piston, specification of a forces and losses at bearings. Finally, the gearbox and generator are selected and the efficiency at generator’s clamps is specified. The Master’s thesis includes the design drawing of a longitudinal turbine view.

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Olsson, Söderhäll Kristina. "Trojaborgarnas dolda agenda : En övergripande beskrivning av trojaborgar i Sverige och en jämförelse av olika teorier om trojaborgarnas funktion." Thesis, Uppsala universitet, Institutionen för arkeologi och antik historia, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-390442.

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A Troy Town is a labyrinth either built of stones or made of turf. They can be found in northern Europe, especially in Scandinavia. The number of Troy Towns in Sweden is outstanding. They are around 400. Most of them are situated on the coast but there are still approximatly 80 inland about 20 of which are located on ancient burial grounds from both bronze and iron age. The Troy Towns in Sweden are mostly marked with round circles of stones, the size of human skulls, and placed directly on the ground. The entrance of a Troy Town is often formed as a cross. There are some turf labyrinths left i

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Suryanarayanan, Saikishan. "Labyrinth Seal Leakage Equation." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-556.

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A seal is a component used in a turbomachine to reduce internal leakage of the working fluid and to increase the machine's efficiency. The stability of a turbomachine partially depends upon the rotodynamic coefficients of the seal. The integral control volume based rotodynamic coefficient prediction programs are no more accurate than the accuracy of the leakage mass flow rate estimation. Thus an accurate prediction of the mass flow rate through seals is extremely important, especially for rotodynamic analysis of turbomachinery. For labyrinth seals, which are widely used, the energy dissipation

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Inam, Orcun. "Labyrinth Seal Leakage Analysis." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10060.

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Annular seals are devices used in turbomachinery to avoid flow losses which reduce efficiency. The dynamic stability of the machine is also improved by the seal. Thus, it is an important subject to understand the flow behavior through the seal. Straight through triangular labyrinth seals are one of the most commonly used types of non-contacting annular seals. The energy dissipation through these seals is achieved by a series of teeth and cavities. As the flow passes above each tooth, a portion of its pressure energy is converted into kinetic energy. A portion of this kinetic energy is dissip

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Chaudhary, Gaurav. "Labyrinth Seal Leakage Analysis." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9811.

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Seals are basic mechanical devices commonly used in machinery to avoid undesired flow losses of working fluids. To understand the working of these seals specifically those placed between relatively moving parts is still one of the major engineering challenges for the scientific community. Particularly Annular seals are one of the most widely used in rotating machinery comprising turbines, compressors and pumps. They are mounted on the shaft that rotates within a stationary case. These seal designs make an impact on (i) machinery energy conversion efficiency and (ii) rotor dynamic stability du

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Ashton, Zachary. "High Temperature Leakage Performance of a Hybrid Brush Seal Compared to a Standard Brush Seal and a Labyrinth Seal." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-7003.

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Adequate sealing in turbomachinery reduces secondary leakage and results in more efficient and stable systems. Labyrinth seals are most common, although brush seals are popular in specialized applications. The Hybrid Brush Seal (HBS) is a novel design that adds to the bristle brush matrix a number of cantilever pads that rest on the rotor surface. Upon shaft rotation the pads lift due to the generation of a hydrodynamic gas film while the brushes effectively seal an upstream pressure. Hence the HBS has no wear and no local thermal distortion effects. Measurements of leakage versus pressure

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Nayak, Kali Charan. "Flow and Windage Heating in Labyrinth Seals." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/2800.

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The ability to quantify leakage flow and windage heating for labyrinth seals with honeycomb lands is critical in understanding gas turbine engine system performance and predicting its component lifes. Variety of labyrinth seal configurations (number of teeth, stepped or straight, honeycomb cell size) are in use in gas turbines, and for each configuration, there are many additional geometric factors that can impact a seal’s leakage and windage characteristics. To achieve high performance in modern gas turbine engines, the labyrinth seals operate at low clearances and high rotational speed which

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Nayak, Kali Charan. "Flow and Windage Heating in Labyrinth Seals." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2800.

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The ability to quantify leakage flow and windage heating for labyrinth seals with honeycomb lands is critical in understanding gas turbine engine system performance and predicting its component lifes. Variety of labyrinth seal configurations (number of teeth, stepped or straight, honeycomb cell size) are in use in gas turbines, and for each configuration, there are many additional geometric factors that can impact a seal’s leakage and windage characteristics. To achieve high performance in modern gas turbine engines, the labyrinth seals operate at low clearances and high rotational speed which

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Anderson, Alain. "Gas Seal Leakage at High Temperature: A Labyrinth Seal and an All-Metal Complaint Seal of Similar Clearance." Thesis, 2013. http://hdl.handle.net/1969.1/151242.

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Reducing secondary leakage is a common challenge in numerous machines, particularly in steam and gas turbines. Too large leakage in seals produces a substantial loss in efficiency and power delivery with an increase in specific fuel consumption. Various seal types exist, each with unique advantages and disadvantages as per leakage, power loss, and wear. Labyrinth seals are most common due to their simple design and low cost. Their main drawback is a too high leakage due to enlarged (worn) clearances when a rotor vibrates. More complicated seal types, such as brush seals can withstand rotor e

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Mehta, Naitik. "Comparison of a Slanted-Tooth See-Through Labyrinth Seal to a Straight-Tooth See-Through Labyrinth Seal for Rotordynamic Coefficients and Leakage." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10825.

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This research compares the leakage and rotordynamic characteristics of a slanted-tooth labyrinth seal to a conventional straight-tooth labyrinth. Detailed results comparing the rotordynamic coefficients and leakage parameters of a slanted-tooth see-through labyrinth seal and a straight-tooth see-through labyrinth seal are presented. The straight-tooth labyrinth seal used in this research was originally tested by Arthur Picardo. The slanted-tooth labyrinth seal was designed and fabricated to be identical to the straight-tooth labyrinth seal in terms of pitch, depth, and the number of teeth. The

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Thorat, Manish R. "Impact of Rotor Surface Velocity, Leakage Models and Real Gas Properties on Rotordynamic Force Predictions of Gas Labyrinth Seals." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7861.

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Rotordynamic coefficients of a gas labyrinth seal are assumed to be frequency independent. However, this assumption loses its validity as rotor surface velocity approaches Mach 1. The solution procedure of 1CV model by Childs and Scharrer which assumes frequency independent force coefficients is modified to allow for calculating frequency dependent force coefficients. A comparative study of the impact of using frequency-dependent model and the original frequency-independent model on stability analysis is made. The results indicate that frequency dependency of force coefficients should be accou

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Tanvir, Hossain Ahmed. "Evaluation of Steam Turbines Triangular Tooth on Stator Labyrinth Seal." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10830.

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Labyrinth seals are often utilized in locations where contact seals cannot be utilized due to the large displacements of the rotating shaft. The performance evaluation of a labyrinth seal is very important to make sure that optimum performance of turbomachinery is attained. Performance parameters such as carryover coefficient, discharge coefficient were evaluated for a see through triangular tooth on stator labyrinth seal. This computational study investigates how flow conditions and seal parameter variations for see through tooth on stator triangular cavity labyrinth seals affect the value of

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