Relevant bibliographies by topics / Clearance seal

Contents

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

Academic literature on the topic 'Clearance seal'

Author: Grafiati
Published: 28 May 2022
Last updated: 31 July 2025

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Journal articles on the topic "Clearance seal"

1

Hur, Min-Seok, Seong-Won Moon, and Tong-Seop Kim. "A Study on the Leakage Characteristics of a Stepped Labyrinth Seal with a Ribbed Casing." Energies 14, no. 13 (2021): 3719. http://dx.doi.org/10.3390/en14133719.

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A new type of stepped seal with a ribbed casing is proposed to efficiently reduce the leakage at the tips of turbine blades. The leakage characteristics of two different types of labyrinth seals (conventional seal vs. ribbed seal) were compared and analyzed through computational fluid dynamics (CFD) in a wide operating range of pressure ratios and clearances. The analysis showed that the ribbed seal has superior leakage performance to the conventional seal at all clearance sizes. With the same clearance size (S/H = 1.0), the flow function of the ribbed seal was approximately 21.5–42.6% less th
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Kaneko, Satoru, Takashi Ikeda, Takuro Saito, and Shin Ito. "Experimental Study on Static and Dynamic Characteristics of Liquid Annular Convergent-Tapered Damper Seals With Honeycomb Roughness Pattern." Journal of Tribology 125, no. 3 (2003): 592–99. http://dx.doi.org/10.1115/1.1538621.

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Honeycomb damper seals with convergent-tapered clearance have been proposed to improve static and dynamic characteristics of liquid annular seals employed in pumps. Their characteristics are experimentally investigated and compared to those for a conventional straight (no taper) annular seal with smooth surface and a straight damper seal with identical honeycomb pattern in seal stator. Three convergent-tapered honeycomb damper seals are used in the test, and have different inlet clearance (maximum clearance) and almost the same outlet clearance (minimum clearance). Their outlet clearance is al
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Al-Qutub, Amro M., D. Elrod, and Hugh W. Coleman. "A New Friction Factor Model and Entrance Loss Coefficient for Honeycomb Annular Gas Seals." Journal of Tribology 122, no. 3 (1999): 622–27. http://dx.doi.org/10.1115/1.555411.

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A new experimental friction factor model for a honeycomb surface was developed using a static seal tester. Three clearances and three lengths were tested for the seals, and Reynolds number ranged from 3000 to 49,000. It was found that the friction factor was a function of Reynolds number and seal clearance only. The clearance effect was dominant and the friction factor was found to increase with increased clearance. A new uncertainty analysis was developed for the experimental friction factor when calculating friction factor using Mach number curve fit. The entrance loss coefficient was found
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Shapiro, W., C. Lee, and H. Jones. "Analysis and Design of a Gas-Lubricated, Sectored, Floating Ring Seal." Journal of Tribology 110, no. 3 (1988): 525–31. http://dx.doi.org/10.1115/1.3261666.

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Helium buffered floating-ring seals used in cryogenic turbopumps are sujbect to large temperature variations, shaft centrifugal growth, and dynamic shaft excursions. To prevent dangerous contact friction over a wide range of operating conditions generally requires liberal clearances with consequent high leakage. Reduction of helium consumption translates into lower space vehicle helium storage requirements and thus increased payload. A hydrostatic sectored floating-ring seal is described with self-adjusting clearance capabilities that enables the seal to operate with small clearances over the
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Childs, D. W., and J. K. Scharrer. "Theory Versus Experiment for the Rotordynamic Coefficient of Labyrinth Gas Seals: Part II—A Comparison to Experiment." Journal of Vibration and Acoustics 110, no. 3 (1988): 281–87. http://dx.doi.org/10.1115/1.3269514.

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An experimental test facility is used to measure the leakage and rotordynamic coefficients of teeth-on-rotor and teeth-on-stator labyrinth gas seals. The test results are presented along with the theoretically predicted values for the two seal configurations at three different radial clearances and shaft speeds to 16,000 cpm. The test results show that the theory accurately predicts the cross-coupled stiffness for both seal configurations and shows improvement in the prediction of the direct damping for the teeth-on-rotor seal. The theory fails to predict a decrease in the direct damping coeff
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Hawkins, Larry, Dara Childs, and Keith Hale. "Experimental Results for Labyrinth Gas Seals With Honeycomb Stators: Comparisons to Smooth-Stator Seals and Theoretical Predictions." Journal of Tribology 111, no. 1 (1989): 161–68. http://dx.doi.org/10.1115/1.3261867.

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Experimental measurements are presented for the rotordynamic stiffness and damping coefficients of a teeth-on-rotor labyrinth seal with a honeycomb stator. Inlet circumferential velocity, inlet pressure, rotor speed, and seal clearance are primary variables. Results are compared to (a) data for teeth-on-rotor labyrinth seals with smooth stators, and (b) analytical predictions from a two-control-volume compressible flow model. The experimental results show that the honeycomb-stator configuration is more stable than the smooth-stator configuration at low rotor speeds. At high rotor speeds, the s
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Childs, Dara W., Matthew Graviss, and Luis E. Rodriguez. "Influence of Groove Size on the Static and Rotordynamic Characteristics of Short, Laminar-Flow Annular Seals." Journal of Tribology 129, no. 2 (2007): 398–406. http://dx.doi.org/10.1115/1.2647471.

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Test results are presented for a smooth seal and three centrally grooved seals that are representative of buffered-flow oil seals in centrifugal compressors. The seals are short (L∕D≅0.21), with a diameter of 117mm and a nominal radial clearance of 0.085mm, netting the clearance-to-radius ratio 0.0015. The grooves have groove depth to clearance ratios (Dg∕Cr) of 5, 10, and 15. Test conditions include three shaft speeds from 4000rpm to 10,000rpm, three inlet oil pressures from 24bar to 70bar, and seal eccentricity ratios from 0 (centered) to 0.7. Dynamic results include stiffness, damping, and
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Ping-guo, Zou, Zhang Zhen-tao, and Li Gang. "Research on the Influence of Steam Turbine Seal Leakage." E3S Web of Conferences 248 (2021): 01014. http://dx.doi.org/10.1051/e3sconf/202124801014.

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CFD was employed to simulate the steam flow in 1.5-stage cascades with three different seal clearances. When the seal clearance is 0, there is no steam seal leakage, no obvious secondary flow in the cascade, and the stage efficiency reaches 88.27%. When the clearance of diaphragm seal and rotor tip seal is 1mm, the leakage of diaphragm seal strongly interferes with the flow in the cascade, which promotes the formation and development of the end-wall secondary flow near rotor hub, and the rotor tip leakage flow has little effect on next stage, and the stage efficiency drops by about 2 percentag
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Huang, Shou Qing, Shuang Fu Suo, Kai Bing Du, Yong Jian Li, and Yu Ming Wang. "Study on a Type of Low-Leakage Brush Seal Porous Media Model." Applied Mechanics and Materials 312 (February 2013): 345–49. http://dx.doi.org/10.4028/www.scientific.net/amm.312.345.

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Computation Fluid Dynamics (CFD) has been employed to calculate the pressure, flow distributions and leakage of brush seal by using Reynolds-Averaged-Navier-Stokes (RANS) method and two-dimensional axisymmetric anisotropic porous medium model. The leakage in brush seal with radial clearance has a marked increase compared with contact brush seal. The leakages of brush seal with different radial clearances have been investigated comparing contact brush seal. A type ofretaining ring structure has been employedto reduce the leakage on radial clearance condition. Also the disturbance effect of reta
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Ma, Dengqian, Jun Li, Yuanqiao Zhang, Zhigang Li, Xin Yan, and Liming Song. "Application of blade tip shroud brush seal to improve the aerodynamic performance of turbine stage." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 6 (2019): 777–94. http://dx.doi.org/10.1177/0957650919883153.

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The blade tip shroud brush seal is applied to replace the labyrinth seal for the aerodynamic performance improvement of turbine stage. The leakage flow characteristics of the brush seal are numerically predicted by using the Reynolds-Averaged Navier–Stokes equations and non-linear Darcian porous medium model. The numerical leakage flow rate of the brush seal is in well agreement with the experimental data. The last and first long teeth of the labyrinth seal were designed to bristle pack named as the postposed and preposed brush seals based on the 1.5 turbine stage. The leakage flow rate and ae
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Dissertations / Theses on the topic "Clearance seal"

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Беда, Іван Микитович, Иван Никитич Беда, Ivan Mykytovych Beda та Д. О. Білоус. "Поліноми Лежандра при апроксимації гідростатичної сили у шпаринному ущільненні". Thesis, Cумський державний університет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/47924.

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Сучасні наукові дослідження вимагають обов‘язкової наявності аналітичної залежності між відповідними параметрами, що дозволяє провести якісне прогнозування та моделювання технічного або фізичного процесу, внести необхідні зміни в обладнання, зробити висновки.
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Choi, Myeonggeun. "Thermal control of gas turbine casings for improved tip clearance." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:14a9ce6a-2af6-4187-afe7-8c6f8e113855.

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A thermal tip clearance control system provides a robust and flexible means of manipulating the closure between the casing and the rotating blade tips in a jet engine, reducing undesirable tip leakage flows. This may be achieved using an impingement cooling scheme on the external casing of the engine in conjunction with careful thermal management of internal over-tip seal segment cavity. For a reduction in thrust specific fuel consumption, the mass flow rate of air used for cooling must be minimised, be at as low a pressure as possible and delivered through a light weight structure surrounding
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Graviss, Matthew Sheridan. "The influence of a central groove on static and dynamic characteristics of an annular liquid seal with laminar flow." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/2359.

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This thesis provides experimental static and dynamic results for four pairs of seals, including a pair of smooth seals and three pairs of centrally grooved seals. The grooved seals have groove depth to clearance ratios (Dg/C) of 5, 10, and 15. The radial clearance of each test seal is 0.0891 mm. Test conditions include three shaft rotational speeds from 4000 to 10000 rpm, three inlet oil pressures from 24 to 70 bars, and seal dimensionless eccentricities from 0 (centered) to 0.7. For each pair of test seals, dynamic results include stiffness and damping coefficients; static results include sta
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Жижка, А. М., Іван Микитович Беда, Иван Никитич Беда та Ivan Mykytovych Beda. "Еспериментальні дослідження радіальної сили у шпаринному ущільненні". Thesis, Сумський державний університет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/48116.

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У проточній частині відцентрового насоса для усунення значних перетоків рідини із зон високого тиску в зони пониженого тиску використовують шпаринні ущільнення. Питанню дослідження радіальної сили, яка виникає в них, присвячено багато робіт. Разом з тим, дана задача вивчена недостатньо.
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Калініченко, Павло Михайлович, Павел Михайлович Калиниченко, Pavlo Mykhailovych Kalinichenko та О. В. Орел. "Рациональное использование силы трения торцовой пары гидростатического уплотнения". Thesis, Сумский государственный университет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40518.

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Карпова, В. О. "Розрахунок статичних характеристик гідростатичних ущільнень із саморегульованим зазором". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40335.

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Розглянуті гідростатичні ущільнення котрі забезпечують надійну роботу у широкому діапазоні тисків і частот обертання. Ущільнення являють собою систему автоматичного регулювання торцевого зазору і витоків ущільнюваної рідини і осьової рівноваги рухомого кільця побудовані статичні характеристики : залежність торцевого зазору і витоків від тиску ущільнюваної рідини.
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Таран, Г. І. "Аналіз динаміки аксіально-рухомого кільця гідростатичного ущільнення із саморегулювальним зазором". Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/40387.

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Беда, Олександр Іванович, Александр Иванович Беда та Oleksandr Ivanovych Beda. "Динамічні характеристики ротора відцентрового насоса з урахуванням особливостей гідродинамічних процесів в шпаринних ущільненнях довільної довжини". Thesis, СумДУ, 2015. http://essuir.sumdu.edu.ua/handle/123456789/41750.

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У дисертаційній роботі виконано уточнення математичної моделі шпаринного ущільнення з урахуванням спірального руху робочої рідини, обумовленого як обертанням валу так і полем тиску рідини в шпарині. Розроблено аналітичний метод розрахунку в лінійній постановці складових радіальної сили. Проведено аналіз нелінійності гідростатичної сили, обумовленої радіальним зміщенням валу. Отримано, що дана сила має м’яку характеристику жорсткості. Проведений фізичний експеримент, який дав змогу оцінити вплив окружних перетоків рідини на величину гідростатичної сили. У відносно довгих шпаринах експерименталь
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Wade, Jonathan Leigh. "Test versus predictions for rotordynamic coefficients and leakage rates of hole-pattern gas seals at two clearances in choked and unchoked conditions." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/424.

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This thesis documents the results of high pressure testing of hole-pattern annular gas seals conducted at the Texas A&M University's Turbomachinery Laboratory. The testing conditions were aimed at determining the test seals sensitivity to pressure ratio, inlet fluid preswirl, rotor speed, and rotor to seal clearance. The rotordynamic coefficients showed only small changes resulting from the different pressure ratios tested. Only the damping terms at the lower frequencies showed some influence. One other notable result from the testing of different pressure ratios is that the seals were tested
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Arby, Nathaniel. "Hur utvecklas den svenska minröjningsfunktionen inom marinen?" Thesis, Swedish National Defence College, Swedish National Defence College, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:fhs:diva-18.

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<p>Sjöminan har sänkt och skadat mer tonnage än alla andra vapensystem till sjöss. Då medel föder motmedel har sjöminan och minröjningen följt varandra i en lång duell.</p><p>Huvudsyftet med denna uppsats är att undersöka hur de svenska minröjningsförbanden utvecklas inom taktik och teknik och hur dessa komponenter förhåller sig till varandra. Uppsatsen söker även svaret på hur utvecklingen från minröjningsklass Landsort till minröjningsklass Koster skett.</p><p>Med hjälp av deskriptiv metod kommer <em>Militärstrategisk doktrin, Doktrin för marina operationer</em> samt <em>Försvarsmaktens läro
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Books on the topic "Clearance seal"

1

Lattime, Scott B. Turbine engine clearance control systems: Current practices and future directions. National Aeronautics and Space Administration, Glenn Research Center, 2002.

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2

Martinez-Sanchez, Manuel. Phase III report on contract number NAS8-35018 entitled Turbine blade tip and seal clearance excitation forces. National Aeronautics and Space Administration, 1992.

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Timchenko, Tat'yana, and Evgenia Filatova. Customs clearance of container shipping. Publishing Center RIOR, 2019. http://dx.doi.org/10.29039/01886-6.

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The study guide in an accessible form addresses the main issues regarding the specifics&#x0D; organization of container shipping;&#x0D; the basic concepts of freight forwarding services are presented with an indication of the regulatory framework governing this type of activity; features of the procedure&#x0D; customs clearance and customs control of the arrival / departure of container ships in sea&#x0D; Russian ports, as well as cargo transported by these&#x0D; courts.&#x0D; The book will quickly get basic&#x0D; knowledge of the subject, as well as qualitatively prepare for the final certifi
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4

Fenwick, Judith. International profiles on marine scientific research: National maritime claims, MSR jurisdiction, and U.S. research clearance histories for the world's coastal states. International Marine Science Cooperation Program, WHOI Sea Grant Program, Woods Hole Oceanographic Institution, 1992.

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Fenwick, Judith. International profiles on marine scientific research: National maritime claims, MSR jurisdiction, and U.S. research clearance histories for the world's coastal States. Woods Hole Oceanographic Institution, 1992.

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Turbine engine clearance control systems: Current practices and future directions. National Aeronautics and Space Administration, Glenn Research Center, 2002.

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7

Menon, Raja. Scenarios for China’s Naval Deployment in the Indian Ocean and India’s Naval Response. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199479337.003.0008.

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Raja Menon, provides a Indian naval practitioner’s perspective on China’s vulnerabilities in the IO and how the Indian Navy would respond to China in the event of conflict. Menon argues that China’s 2015 Defence White Paper gives political clearance to (i) funding of the PLA Navy (PLAN) to become a world class navy, (ii) protection of its prime Sea Lines of Communication (SLOCs) including those in the IO, and (iii) eventual deployment of the PLAN whenever Chinese interests exist. The importance of Chinese SLOCs in the Indian Ocean are of such magnitude that a permanent Chinese presence in the
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Book chapters on the topic "Clearance seal"

1

Dadd, M. W., P. B. Bailey, G. Davey, T. Davis, and B. J. Tomlinson. "The Linearity of Clearance Seal Suspension Systems." In Cryocoolers 12. Springer US, 2003. http://dx.doi.org/10.1007/0-306-47919-2_35.

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Wei, Yuan, Zhaobo Chen, Yinghou Jiao, Xin Du, and Zhouqiang Zhang. "Effects of Clearance on Leakage Flow Characteristics of Labyrinth Brush Seal." In Proceedings of the 9th IFToMM International Conference on Rotor Dynamics. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_167.

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Su, Hua. "Performance and Parameter Sensitivity Analysis of Finger Seal with Radial Clearance." In Advances in Mechanical Design. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9941-2_47.

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Lv, Chenglong, Lidong He, Guo Chen, Peng Hu, Bingkang Zhang, and Jinji Gao. "Experimental Investigation on Suppressing Fluid-Induced Vibration in the Seal Clearance by Anti-swirl Flow." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09507-3_11.

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Kimura, Shogo, Tsuyoshi Inoue, Hiroo Taura, and Akira Heya. "Modeling of the Divergently Worn Annular Seal for the Two-Way Coupled Fluid–Structure Interaction Analysis of Shaft Vibration and Clearance Flow." In Proceedings of the 11th IFToMM International Conference on Rotordynamics. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-40459-7_28.

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Forsberg, Gerald. "Wreck dispersal. Harbour clearance." In Salvage from the Sea. Routledge, 2025. https://doi.org/10.4324/9781003612643-7.

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Spoor, P. S., and J. A. Corey. "A Novel Method for Controlling Piston Drift in Devices with Clearance Seals." In Cryocoolers 13. Springer US, 2005. http://dx.doi.org/10.1007/0-387-27533-9_31.

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Schmall, K. H. "Nontactile Clearance and Seam Tracking Sensors of Power Laser Cutting and Welding Purposes." In Laser/Optoelektronik in der Technik / Laser/Optoelectronics in Engineering. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82638-2_65.

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Song, Chenxing, Yu Fan, Mingchun Deng, Ziyue Liu, and Yi Shen. "Research on the Method to Formulate the Allowable Standard for Aero-Engine Labyrinth Seals Clearances." In Lecture Notes in Electrical Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-7423-5_69.

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Dai, Jian, and Paban Acharya. "Evaluation of Train Travel Inside Submerged Floating Tunnel Under Wave Loads." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_98.

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AbstractRailway trains are an efficient mode of transportation for passengers and goods in large quantities. The planning of railway lines, however, needs to take the complex terrain into account. For areas with land parcels separated by wide and deep water bodies, the railway connection is even more challenging. Submerged floating tunnels (SFTs), on the other hand, become an appealing option to connect the separated land parcels. They utilize the natural water buoyancy to support the weight and payloads of the structure and traffic. They have a much lower dependency on the seabed conditions a
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Conference papers on the topic "Clearance seal"

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Kim, Taehong. "Methods and Apparatus for Real-Time Seal Clearances Assessment Using a Pressure Measurement." In ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/gt2023-103264.

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Abstract Today’s aircraft turbine engines are exposed to higher temperatures, higher pressure with the need of increased rotor life to meet customer demand with higher thrust and better fuel efficiency. The case structure and rotating parts have different thermal and mechanical expansion and contraction which drive clearances to be excessive. In most of commercial engines, interstage seals (ISS) and mid-seals connected to tip clearance control system are designed to schedule seal clearances to maintain cavity pressures and balance purge flow. The system is designed to manage the gap for effici
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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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Thorat, Manish R., and Brian Bauer. "Measured Influence of Clearance and Eccentricity on Brush Seal Leakage Characteristics." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15075.

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Abstract Brush seals are used in turbomachinery for reduced leakage as compared to conventional seals such as labyrinth seals. Early applications tended to favor having a line-to-line to a slight interference fit of the bristles to the shaft, but more recent applications have favored the use of a slight initial clearance fit for the purpose of reducing bristle wear. In these brush seals with clearance, the phenomenon of bristle blow-down largely negates the leakage degradation due to clearance, with bristles bending to reduce the clearance gap. This paper presents experimental results for a 10
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Roy, Binayak, Hrishikesh V. Deo, and Xiaoqing Zheng. "Progressive Clearance Labyrinth Seal for Turbo-Machinery Applications." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64870.

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Turbomachinery sealing is a challenging problem due to the varying clearances caused by thermal transients, vibrations, bearing lift-off etc. Leakage reduction has significant benefits in improving engine efficiency and reducing emissions. Conventional labyrinth seals have to be assembled with large clearances to avoid rubbing during large rotor transients. This results in large leakage and lower efficiency. In this paper, we propose a novel Progressive Clearance Labyrinth Seal that is capable of providing passive fluidic feedback forces that balance at a small tip-clearance. A modified packin
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Pelletti, Joseph M., and Dara W. Childs. "A Comparison of Experimental Results and Theoretical Predictions for the Rotordynamic Coefficients of Short (L/D = 1/6) Labyrinth Seals." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0231.

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Abstract Experimental results for the rotordynamic coefficients of short (L/D = 1/6) teeth-on-stator and teeth-on-rotor labyrinth seals are presented. The effects that pressure ratio (fluid density), rotor speed, fluid pre-swirl and seal clearance have on these coefficients are studied. Tests were run out to speeds of 16000 rpm with a supply pressure of 17.3 bar and seal clearances ranging from 0.229–0.419 mm. The experimental results are compared with theoretical predictions of a two control volume compressible flow model. The experimental results show that decreases in pressure ratio and inc
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Zhang, Li, Hui-ren Zhu, Cun-liang Liu, and Fei Tong. "Experimental and Numerical Investigation on Leakage Characteristic of Stepped Labyrinth Seal." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56743.

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Labyrinth seals represent an important flow element in the secondary air system of aero engines. The influence of seal clearance and teeth parameters on the leakage characteristic of a real size stepped labyrinth seal was experimentally and numerically analyzed in a stationary state. Two kinds of labyrinth seals were studied in this investigation that are generally used in gas turbines, namely downward stepped labyrinth and upward stepped labyrinth. The differences of seal flow leakage mechanisms between the two types of the labyrinth were investigated. In order to eliminate the scaling effect
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Li, Jun, Yangzi Huang, Zhigang Li, et al. "Effects of Clearances on the Leakage Flow Characteristics of Two Kinds of Brush Seals and Referenced Labyrinth Seal." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22877.

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Numerical investigations of leakage flow fields of two kinds of brush seals with four sealing clearances were conducted in this paper. The Reynolds-Averaged Navier-Stokes (RANS) and non-Darcian porous medium model solutions were applied as the numerical approach to analyze the flow characteristics of brush seal. The reliability and accuracy of the RANS and non-Darcian porous medium model for leakage flow in brush seals were established by comparison with the experimental data. The referenced labyrinth seal was changed into a multi-stage brush seal which has two configurations. One configuratio
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Selvaraji, M., Sam P. Joseph, and N. Nirmal. "Optimization of Labyrinth Seal for Screw Compressor." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32275.

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There is a growing demand for compressed air in the industry for various applications. Majority of industrial requirements is in line with screw compressor operating range. Design and construction of screw compressors are demanding tasks that require advanced calculations and theoretical knowledge. Clearances play a major role in the performance and reliability aspects of a screw compressor. Seals are provided in compressors to fit around rotor shafts in order to prevent the leakage of lubricating oil and working medium. However there is a small clearance between the seal and rotor shaft, whic
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Messenger, Andrew, Richard Williams, Grant Ingram, Simon Hogg, Stacie Tibos, and Jon Seaton. "A Dynamic Clearance Seal for Steam Turbine Application." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43471.

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Effective sealing in turbomachinery reduces the leakage flow bypassing the turbine blades and also reduces the losses where the leakage flow mixes with the primary flow. In general the clearance should be as small as possible but is limited by thermal and mechanical effects which vary with load. In recent years intermittent energy sources, particularly wind and solar, have appeared in greater numbers on the power network. As a consequence conventional power plants need to become more flexible to accommodate renewable energy generation. A sealing technology which can accommodate rapid changes i
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Marechale, Russell, Min Ji, and Michael Cave. "Experimental and Numerical Investigation of Labyrinth Seal Clearance Impact on Centrifugal Impeller Performance." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43778.

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Labyrinth seals are widely used in industrial multistage centrifugal compressors to reduce internal leakage and maintain compressor performance for a prolonged operation time. The leakage flow across the shroud seal of covered impellers and the hub seal of the rotating shaft has an important effect on the compressor performance. The amount of leakage flow is primarily a function of seal running clearances, which is typically designed based on the compressor working environment, such as pressure and temperature conditions. The present paper discusses the experimental and numerical studies of se
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Reports on the topic "Clearance seal"

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Rimpel, Aaron, Abhay Patil, and Mark Anguiano. PR-316-21201-R01 A Study of the Effects of Liquid Contamination on Seal Performance. Pipeline Research Council International, Inc. (PRCI), 2022. http://dx.doi.org/10.55274/r0012229.

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This project is a continuation of research to enhance dry gas seal (DGS) reliability. Previous work reviewed failures from literature and experience of manufacturers and end-users and identified that liquid contamination was the most common cause, but it was concluded there was insufficient quantitative data to base recommendations on for further DGS reliability enhancements. Therefore, experimental and analytical investigations were pursued to fill the void. The ultimate objective was to be able to predict DGS failures due to liquid contamination, which could lead to greater DGS reliability t
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Lee. L51588 Improved Internal Seals for Pipeline Centrifugal Compressors. Pipeline Research Council International, Inc. (PRCI), 1988. http://dx.doi.org/10.55274/r0010524.

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Reviews current technology of internal labyrinth seals and concludes that internal leakage can reduce compressor efficiencies as much as 3 to 6 percent. Discusses limitations on abradable seals with tighter clearances and the effect of compressor surge on both types of seals. Proposes resiliently mounted seals as subject for future investigation to accommodate rotor movement without excessive seal wear.
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Keller, Mareike, Aaron J. Beck, Nikolaj Diller, et al. Monitoring ecological consequences of marine munition in the Baltic Sea 2024 - Cruise No. AL615, 2nd – 12th July 2024, Kiel (Germany) – Kiel (Germany), „MecoMM-BS I - III“. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2025. https://doi.org/10.3289/cr_al615.

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ALKOR cruise AL615 took place as part of the project CONMAR (https://conmarmunition.eu/) which is part of the DAM mission sustainMare (https://www.sustainmare.de/). It was the continuation of the munition monitoring started within the BMBF‐funded project UDEMM (Environmental Monitoring for the Delaboration of Munition in the Sea; https://udemm.geomar.de/), the EMFF (European Maritime and Fisheries Fund) ‐funded projects BASTA (Boost Applied munition detection through Smart data detection in and AI workflows; https://www.basta‐munition.eu) and ExPloTect (Ex‐situ, near‐real‐time detection compou
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Beck, Aaron. PRECLEAR: PRE-assessment to monitor consequences of marine munitions CLEARance, Cruise No. AL609, 20 – 28 March 2024, Kiel (DE) – Kiel (DE). GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2024. https://doi.org/10.3289/cr_al609.

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Cruise AL609 was a rapid-response cruise with RV ALKOR as part of the funded BMBF joint project CONMAR (CONcepts for conventional MArine Munition Remediation in the German North and Baltic Sea). The project is led by GEOMAR with eight additional partners (AWI, GCF, IOW, Senckenberg, Thünen, UBA, UKSH, URO) within the DAM Mission “Protection and sustainable use of marine areas”. One of the primary objectives of the CONMAR project is to provide the scientific support for commercial and industrial remediation of marine munitions. The first such clearance is now planned with financing through the
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Kampmeier, Mareike, Jens Greinert, Aaron J. Beck, et al. Monitoring ecological consequences of marine munition in the Baltic Sea 2023, Cruise No. AL603, 3rd – 16th October 2023, Kiel (Germany) – Kiel (Germany), „MecoMM-BS - II“. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2024. https://doi.org/10.3289/cr_al603.

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The cruise AL603 ("MecoMM II") is one of three research cruises that take place in 2023 and 2024 and are an integral part of the ongoing research project CONMAR (conmarmunition. eu/), which deals with the ecological impact of dumped munitions in the German Baltic Sea. These expeditions ensure complete monitoring over several years. During this expedition, substances released from munitions on the seabed will also be analysed beyond national borders in order to better assess the pollution of the Baltic Sea. Several German research institutions are involved in the AL603 cruise, and there are con
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Keller, Mareike, Aaron J. Becker, Nikolaj Diller, et al. Monitoring ecological consequences of marine munition in the Baltic Sea 2024 - Cruise No. AL622, 14th – 21st October 2024, Kiel (Germany) – Kiel (Germany), „POST-Clear“. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2024. https://doi.org/10.3289/cr_al622.

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ALKOR cruise AL622 took place as part of the project CONMAR (https://conmarmunition.eu/) which is part of the DAM mission sustainMare (https://www.sustainmare.de/). It was the continuation of the munition monitoring started within the BMBF‐funded project UDEMM (Environmental Monitoring for the Delaboration of Munition in the Sea; https://udemm.geomar.de/), the EMFF (European Maritime and Fisheries Fund) ‐funded projects BASTA (Boost Applied munition detection through Smart data detection in and AI workflows; https://www.basta‐munition.eu) and ExPloTect (Ex‐situ, near‐real‐time detection compou
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