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Journal articles on the topic 'Labyrinth Seal'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Denecke, J., V. Schramm, S. Kim, and S. Wittig. "Influence of Rub-Grooves on Labyrinth Seal Leakage." Journal of Turbomachinery 125, no. 2 (2003): 387–93. http://dx.doi.org/10.1115/1.1539516.

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An experimental investigation on the influence of stator rub-grooves on labyrinth seal leakage is presented in the present paper. In current labyrinth seal designs, abradable lands allow the rotor labyrinth teeth to rub grooves into the stator. These rub-grooves have a large influence on the seal leakage characteristic and impair the overall engine efficiency. To improve the understanding of rub-groove effects, discharge coefficients were determined using a plain nonrotating labyrinth seal model of scale 4:1 considering a wide variation of rub-groove geometries at different seal clearances. Th

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2

Liu, Chunrui, Lidong He, Xingyun Jia, Haozhe Zhu, Tao Chen, and Wenhao Wang. "Effect of Installation Error on Rotary Seal of Aero Engine." Aerospace 9, no. 12 (2022): 820. http://dx.doi.org/10.3390/aerospace9120820.

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The rotary seal is a key component of the aero engine. Under actual working conditions, most rotary seals always operate in an eccentric state (caused by installation errors), and when a large eccentricity occurs, it may lead to a large amount of gas leakage, resulting in a decrease in aero engine efficiency, which ultimately affects the reliability and life of the aero engine. Therefore, the effect of installation error on the rotary seal of the aero engine was studied in this research. The flow field numerical models of the honeycomb seal, labyrinth seal, and hybrid labyrinth–honeycomb seal

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3

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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4

Rijal, Mamata, Hari Prasad Neopane, Sailesh Chitrakar, Arun Pandey, and Jwala Prasad Dev. "Numerical study of erosion on labyrinth seals of Francis turbine." Journal of Physics: Conference Series 2629, no. 1 (2023): 012021. http://dx.doi.org/10.1088/1742-6596/2629/1/012021.

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Abstract Sediment erosion is one of the most challenging problems in hydropower plants in Nepal. The sediments like quartz erode the turbine components like runner blades, labyrinth seals and others. This study has focused on the erosion effects in different labyrinth seals of the Francis turbine. Labyrinth seals are non-contact seals used for minimizing unwanted leaks between stationary and rotating parts. The labyrinth consists of two parts: a static seal connected to the turbine covers and a rotating part connected to the runner. The labyrinth gap is small for a new turbine and so the leaka

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5

Laos, Hector E., John M. Vance, and Steven E. Buchanan. "Hybrid Brush Pocket Damper Seals for Turbomachinery." Journal of Engineering for Gas Turbines and Power 122, no. 2 (2000): 330–36. http://dx.doi.org/10.1115/1.483211.

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Pocket damper seals perform a dual function: both sealing the pressurized gas around a rotating shaft and providing large amounts of vibration damping. The annular cavity between the labyrinth seal teeth is subdivided into separate annular cavities around the circumference of the rotor by partitioning walls. Also, the upstream and downstream teeth have different radial clearances to the rotor. These seals have been shown to provide a remarkable amount of direct damping to attenuate vibration in turbomachinery, but they generally leak more than conventional labyrinth seals if both seals have th

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6

Zhu, Yuming, Yuyan Jiang, Shiqiang Liang, Chaohong Guo, Yongxian Guo, and Haofei Cai. "One-Dimensional Computation Method of Supercritical CO2 Labyrinth Seal." Applied Sciences 10, no. 17 (2020): 5771. http://dx.doi.org/10.3390/app10175771.

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An actual one-dimensional(1-D) computation method for a labyrinth seal is proposed. Relevant computation hypotheses for the 1-D method are analyzed and the specificity of internal flow in an SCO2 (supercritical CO2) labyrinth seal is explored in advance. Then, the experimental correlation discharge coefficient and the residual kinetic energy coefficient used in SCO2 labyrinth seals are proposed. In addition, the speed of sound in two-phase flow is corrected in the 1-D method. All recent experimental results of the SCO2 labyrinth seal are sorted out and the latest experimental results of a step

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7

Chun, Ye Hwan, and Joon Ahn. "Optimizing the Geometric Parameters of a Stepped Labyrinth Seal to Minimize the Discharge Coefficient." Processes 10, no. 10 (2022): 2019. http://dx.doi.org/10.3390/pr10102019.

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A series of numerical simulations were performed to study the discharge coefficient based on the geometric parameters of a stepped labyrinth seal that sealed the secondary flow path of a gas turbine. In contrast with straight-through seals, stepped labyrinth seals introduce additional geometrical parameters related to the steps. In this study, three shape variables were observed: step height (SH), position, and cavity width (CW). The sensitivity to the leakage flow of the shape variable in the stepped labyrinth seal was analyzed. The mechanism for improving the sealing performance of stepped l

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8

Moore, J. Jeffrey. "Three-Dimensional CFD Rotordynamic Analysis of Gas Labyrinth Seals." Journal of Vibration and Acoustics 125, no. 4 (2003): 427–33. http://dx.doi.org/10.1115/1.1615248.

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Labyrinth seals are utilized inside turbomachinery to provide noncontacting control of internal leakage. These seals can also play an important role in determining the rotordynamic stability of the machine. Traditional labyrinth seal models are based on bulk-flow assumptions where the fluid is assumed to behave as a rigid body affected by shear stress at the interfaces. To model the labyrinth seal cavity, a single, driven vortex is assumed and relationships for the shear stress and divergence angle of the through flow jet are developed. These models, while efficient to compute, typically show

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9

Childs, D., D. Elrod, and K. Hale. "Annular Honeycomb Seals: Test Results for Leakage and Rotordynamic Coefficients; Comparisons to Labyrinth and Smooth Configurations." Journal of Tribology 111, no. 2 (1989): 293–300. http://dx.doi.org/10.1115/1.3261911.

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Test results are presented for leakage and rotordynamic coefficients for seven honeycomb seals. All seals have the same radius, length, and clearance; however, the cell depths and diameters are varied. Rotordynamic data, which are presented, consist of the direct and cross-coupled stiffness coefficients and the direct damping coefficients. The rotordynamic-coefficient data show a considerable sensitivity to changes in cell dimensions; however, no clear trends are identifiable. Comparisons of test data for the honeycomb seals with labyrinth and smooth annular seals shows the honeycomb seal had

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10

Wang, Na, Yongbing Cao, Zhencong Sun, Shixin Tang, and Seung-Bok Choi. "Leakage Characteristics and Experimental Research of Staggered Labyrinth Sealing." Lubricants 12, no. 11 (2024): 369. http://dx.doi.org/10.3390/lubricants12110369.

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The staggered labyrinth seal is widely used in aerospace, transportation, mining, and other fields due to its advantages of adapting to high speed, reliable sealing performance, and low or even frictionless friction between dynamic and static rotors. The traditional calculation method of labyrinth seal leakage mostly focuses on the fact that the internal medium is an ideal gas and only considers a single effect, which cannot accurately describe the leakage of liquid medium lubricating oil in the labyrinth seal. Therefore, this study focuses on the leakage characteristics of labyrinth seals, an

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11

Yu, Zhentao, Jinbo Jiang, Xuan Zhang, Mengli Zhang, and Canlong Li. "Comparative Study on the Leakage Characteristics and Parameter Influence of Bio-Inspired Fishway Staggered Labyrinth Seals." Lubricants 13, no. 3 (2025): 95. https://doi.org/10.3390/lubricants13030095.

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Innovating seal structures and optimizing size parameters are effective ways to enhance the leakage characteristics of labyrinth seals (LSs). Inspired by the ecological fishways with high flow resistance on dam sides, a novel bio-inspired staggered labyrinth seal is proposed. The leakage characteristics of both the curved-edged bio-inspired labyrinth seal (CELS) and the straight-edged bio-inspired labyrinth seal (SELS) at different tooth-incline angles are studied numerically and experimentally. The influence of key geometrical parameters on the leakage characteristics and flow field parameter

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12

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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13

Vance, J. M., and J. Li. "Test Results of a New Damper Seal for Vibration Reduction in Turbomachinery." Journal of Engineering for Gas Turbines and Power 118, no. 4 (1996): 843–46. http://dx.doi.org/10.1115/1.2817004.

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A new type of labyrinth gas seal for damping vibration and whirl, called the TAMSEAL, has been evaluated in both nonrotating and rotating tests at Texas A&M University. Test results of the prototype, along with comparison tests of a conventional labyrinth seal, show up to 100 times more direct damping than the conventional bladed seal. The new design also has a feature that blocks swirl of the working fluid, which is known to be rotordynamically destabilizing in machines with conventional seals. Coastdown tests of the new seal were conducted at various pressures on a rotordynamic test appa

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14

Ransom, David, Jiming Li, Luis San Andre´s, and John Vance. "Experimental Force Coefficients for a Two-Bladed Labyrinth Seal and a Four-Pocket Damper Seal." Journal of Tribology 121, no. 2 (1999): 370–76. http://dx.doi.org/10.1115/1.2833949.

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Experiments are presented to identify the stiffness and damping force coefficients of a two-blade, teeth on stator labyrinth seal with diverging clearance and its modified version as a four-pocket gas damper seal. The seals were tested without journal rotation and at rotor speeds of 1500 rpm and 3000 rpm for seal supply to ambient pressure ratios ranging from 1 to 3. Calibrated impact loads excite a flexibly supported housing holding rigidly the test seal. The impact loads and seal displacement and acceleration time responses are measured and recorded as frequency spectra. The instrumental var

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15

Park, Won Man, Sung Man Son, Dae Kyung Choi, Hong Guk Lee, and Choengryul Choi. "Oil-Sealing Performance Evaluation of Labyrinth Seal Using Combined Finite Element Analysis and Computational Fluid Dynamics." Lubricants 11, no. 9 (2023): 400. http://dx.doi.org/10.3390/lubricants11090400.

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Mechanical seals, such as labyrinth seals, are typically installed at the turbine outlets to prevent oil leakage. However, these seals undergo deformation because of the vibrations of the rotor, even during normal turbine operating conditions, which may cause an increase in oil leakage. In this study, the oil leakage performance of three labyrinth seals with different types of seal teeth, narrow stainless teeth (Type 1), wide aluminum teeth fixed on the body (Type 2), and fixed wide aluminum movable teeth (Type 3), were evaluated using finite element (FE) and computational fluid dynamics (CFD)

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16

Ingistov, Steve. "Compressor Discharge Brush Seal for Gas Turbine Model 7EA." Journal of Turbomachinery 124, no. 2 (2002): 301–5. http://dx.doi.org/10.1115/1.1457456.

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Single-shaft, heavy-duty industrial gas turbines are extremely sensitive to compressed air bypassing at compressor discharge plane. This plane represents the highest pressure location in entire gas turbine unit (GTU). Standard method to minimize compressed air leakage is labyrinth seal that is integral part of the cylindrical element here called “inner barrel.” The inner barrel is also the part of compressor discharge diffuser. This paper describes the efforts related to conversion of standard labyrinth seal into the hybrid seal that is combination of labyrinth and brush seals.

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17

Wang, Zhiguo, Bo Zhang, Yuanxiang Chen, Sheng Yang, Hongmei Liu, and Honghu Ji. "Investigation of Leakage and Heat Transfer Properties of the Labyrinth Seal on Various Rotation Speed and Geometric Parameters." Coatings 12, no. 5 (2022): 586. http://dx.doi.org/10.3390/coatings12050586.

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To investigate the influence of the variation of geometric parameters on the leakage and heat transfer characteristics of labyrinth seals at various rotational speeds, the labyrinth seal models with different geometric parameters were numerically simulated based on the control variable methods. Results show the aerodynamic mechanism of leakage characteristics changing with rotational speed, as well as the leakage characteristics of labyrinth seals under the coupling action of geometric parameters and rotating speeds. When the characteristic scale changes along the direction of centrifugal forc

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18

Wang, Zhiguo, Bo Zhang, Yuanxiang Chen, Sheng Yang, Hongmei Liu, and Honghu Ji. "Investigation of Leakage and Heat Transfer Properties of the Labyrinth Seal on Various Rotation Speed and Geometric Parameters." Coatings 12, no. 5 (2022): 586. http://dx.doi.org/10.3390/coatings12050586.

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To investigate the influence of the variation of geometric parameters on the leakage and heat transfer characteristics of labyrinth seals at various rotational speeds, the labyrinth seal models with different geometric parameters were numerically simulated based on the control variable methods. Results show the aerodynamic mechanism of leakage characteristics changing with rotational speed, as well as the leakage characteristics of labyrinth seals under the coupling action of geometric parameters and rotating speeds. When the characteristic scale changes along the direction of centrifugal forc

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19

Liu, Zhen Ping, Shu Lian Liu, and Shui Ying Zheng. "A New Method to Realize Unsteady Calculation of Flow in Labyrinth Seals." Advanced Materials Research 199-200 (February 2011): 68–71. http://dx.doi.org/10.4028/www.scientific.net/amr.199-200.68.

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As non-contact seal, labyrinth seal is widely used in rotor system of high speed. However, with the development of turbo-machinery toward high performance and huge capacity, gas excitation vibration within the labyrinth seal becomes the main reason threatening safe operating of machinery sets. Recently three dimensional computational fluid dynamic was applied to analyse inside flow in labyrinth seal. These researches, while greatly improve rotordynamic prediction of labyrinth seals, are mostly focused in steady calculation. In fact, rotor inside the seal is whirling in a nonlinear behaviour, w

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20

Rhode, D. L., and R. I. Hibbs. "Clearance Effects on Corresponding Annular and Labyrinth Seal Flow Leakage Characteristics." Journal of Tribology 115, no. 4 (1993): 699–704. http://dx.doi.org/10.1115/1.2921696.

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A previous Navier-Stokes finite difference computer code is extended in order to compute seal leakage directly from given upstream and downstream reservoir pressures. The numerical results are in excellent agreement with previous measurements, the discrepancy being less than eight percent. Annular seals are found to leak approximately twenty percent more than corresponding labyrinths over the entire range of realistic clearance. A rather unexpected finding is that a dramatic increase of swirl velocity occurs near the discharge of small-clearance annular seals, which does not arise in correspon

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21

Zhang, Mingjie, Jiangang Yang, Wanfu Zhang, and Qianlei Gu. "Reducing labyrinth seal leakage with application of axially arranged baffles with increasing height." Journal of Physics: Conference Series 2256, no. 1 (2022): 012036. http://dx.doi.org/10.1088/1742-6596/2256/1/012036.

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Abstract For turbomachines, reducing seal leakage is beneficial for increasing the efficiency and reducing the energy consumption. This study proposes the design of the axially arranged baffles with increasing height to reduce the leakage of the labyrinth seal. Due to the existence of the axially arranged baffles with increasing height, the leakage fluid is guided to flow into the seal cavities. In each seal cavity, one large vortex is induced, and additional small vortexes are induced in the regions between adjacent baffles. The leakage flow resistance and kinetic energy dissipation of the le

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22

Cao, Hao, Wanfu Zhang, Lu Yin, and Li Yang. "Numerical Study of Leakage and Rotordynamic Performance of Staggered Labyrinth Seals Working with Supercritical Carbon Dioxide." Shock and Vibration 2022 (January 20, 2022): 1–17. http://dx.doi.org/10.1155/2022/3896212.

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The numerical model of a staggered labyrinth seal working with supercritical carbon dioxide (S–CO2) is established. The dynamic and static characteristics of the staggered labyrinth seal for different axial shifting distances of the rotor, various cavity geometries (heights/widths of the rotor convex plate, heights of the seal cavity), and seal clearances were investigated and compared with the conventional see-through labyrinth seal. The results show that the effective damping coefficient (Ceff) with positive axial shifting distance is higher than that with negative axial shifting distance. W

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23

Matveev, Andrey A., Andrey Yu Tisarev, Sergey V. Falaleev, and Kseniya A. Mironova. "Influence of worn on flow characteristics of aircraft engine labyrinth seals." Journal of Dynamics and Vibroacoustics 10, no. 1 (2024): 7–20. http://dx.doi.org/10.18287/2409-4579-2024-10-1-7-20.

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Labyrinth seals are currently the most common type of sealant in aircraft engines. The article proposes an approach to take into account the value of their cutting into the stator part when determining the air flow rate. The comparison of the results of calculation of characteristics of labyrinth seals taking into account cutting of seal combs into the stator part with the use of semi-empirical and numerical models is carried out. The nature of the change in air flow through the seal is revealed when the geometric parameters of the grooves in the stator part change as a result of wear of the a

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24

Scharrer, J. K. "Rotordynamic Coefficients for Stepped Labyrinth Gas Seals." Journal of Tribology 111, no. 1 (1989): 101–7. http://dx.doi.org/10.1115/1.3261858.

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The basic equations are derived for compressible flow in a stepped labyrinth gas seal. The flow is assumed to be completely turbulent in the circumferential direction where the friction factor is determined by the Blasius relation. Linearized zeroth and first-order perturbation equations are developed for small motion about a centered position by an expansion in the eccentricity ratio. The zeroth-order pressure distribution is found by satisfying the leakage equation while the circumferential velocity distribution is determined by satisfying the momentum equations. The first order equations ar

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25

Jahn, Ingo HJ. "Design approach for maximising contacting filament seal performance retention." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, no. 5 (2014): 926–42. http://dx.doi.org/10.1177/0954406214541433.

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Good sealing is a key requirement for modern efficient turbomachinery such as steam and gas turbines. A class of seals that promise better performance, compared to conventional labyrinth seals, are contacting filament seals such as brush, leaf, or finger seal. When new, these filament seals offer better performance; however, if poorly designed they wear excessively, resulting in leakages higher than a comparable labyrinth seal. This paper outlines a design methodology for selecting ideal contacting filament seal properties for a given operating cycle or set of operating cycles. Following this

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26

Mammar, Lahouari, Yahiaoui Tayeb, Omar Ladjedel, and Ondřej Šikula. "Fluid Thermal Effect on Non-contacting Labyrinth Seal of 20 MW Steam Turbine." Periodica Polytechnica Mechanical Engineering 64, no. 1 (2019): 31–42. http://dx.doi.org/10.3311/ppme.14176.

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This paper is divided into two parts; the first describes a CFD analysis of a gland packing labyrinth seals in 20 MW steam turbine in LNG plant using ANSYS CFX code as an isothermal simulation in fluid domain. The results of two turbulence models k-ε and k-ω SST are compared and validated against experimental data. It is shown that the labyrinth seal leakage is proportional to the clearance cube so any variation in clearance can have a significant impact on the steam leakage. This clearance between the shaft and the labyrinth seal vary as a function of operating temperature due to the differen

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27

Bondarenko, G. A., V. N. Baga, and I. A. Bashlak. "Flow Simulation in a Labyrinth Seal." Applied Mechanics and Materials 630 (September 2014): 234–39. http://dx.doi.org/10.4028/www.scientific.net/amm.630.234.

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The paper studies the labyrinth seals of centrifugal compressor profit-proved stages using modern methods of numerical and physical modeling of the centrifugal compressor stages. A series of studies of the effect of operational and geometrical parameters on the maze, namely the quantities of the packed differential pressure, speed, fluid, geometric parameters of the seal, the magnitude of the eccentricity and radial clearance swirl flow at the inlet of a seal, etc. The technique of physical modeling seal has been specified. Research was conducted in two phases: numerical simulation using compl

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28

Kaszowski, Paweł, Marek Dzida, and Piotr Krzyślak. "Calculations of labyrinth seals with and without diagnostic extraction in fluid-flow machines." Polish Maritime Research 20, no. 4 (2013): 34–38. http://dx.doi.org/10.2478/pomr-2013-0038.

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ABSTRACT Labyrinth seals are essential components of steam turbine unit constructions. Two types of labyrinth seals can be named, the first of which is the seal without diagnostic steam extraction, and the second - with extraction. The distribution of flow parameters along the packing is affected remarkably by the average seal clearance. The presence of diagnostic extraction leads to the equation system which is determinable and can be inversed to calculate the average seal clearance Si. Analysing the obtained results leads to the conclusion that the information about this parameter provides o

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29

Baek, Seung Il, and Joon Ahn. "Optimizing the Geometric Parameters of a Straight-Through Labyrinth Seal to Minimize the Leakage Flow Rate and the Discharge Coefficient." Energies 14, no. 3 (2021): 705. http://dx.doi.org/10.3390/en14030705.

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A straight-through labyrinth seal is one of the most popular non-contacting annular seals through which energy dissipation by turbulence viscosity interaction is achieved with a series of teeth and cavities. The geometric parameters of the straight-through labyrinth seal, such as clearance, tooth width, tooth height, cavity width, and tooth inclination angle, affect its performance. The space for installing a labyrinth seal in turbomachinery is limited, and so it is important to optimize its geometry for a fixed axial length in order to minimize the leakage flow rate and the discharge coeffici

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30

Izemenko, V., A. Zahorulko, and Yu Zahorulko. "Leakage and rotordynamic coefficients of labyrinth-scallop seals." Problems of Tribology 29, no. 4/114 (2024): 14–23. https://doi.org/10.31891/2079-1372-2024-114-4-14-23.

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Reducing leakages and improving the rotor-dynamic damping characteristics of annular seals is an essential problem of sealing technology. A whole range of damping seals are used to seal the shafts of turbomachines, such as honeycomb, hole pattern, pocket, and scallop seals. To reduce the cost and production time, the scallop seals are increasingly used. They showed quite good dynamic and leakage characteristics in the modernization of compressors in the chemical industry. Some designs of scallop seals are able not only to increase dynamic performance (additional use of swirl brakes in the form

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31

Wu, Luji, Yibo Sun, Kunlong Li, Linjie Yang, Junhao Chen, and Jingyuan Wang. "Experimental Study on Non-contact Labyrinth Seal under Negative Pressure Intervention." Journal of Physics: Conference Series 2694, no. 1 (2024): 012013. http://dx.doi.org/10.1088/1742-6596/2694/1/012013.

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Abstract The non-contact labyrinth seal structure of a high-speed gearbox was taken as the research object, a non-contact labyrinth seal structure under negative pressure intervention was designed, and its rationality was verified by simulation analysis. An airfoil-shaped acquisition device for collecting negative pressure was designed, and its rationality was analyzed by simulation. According to the design, a test platform for non-contact labyrinth seal under negative pressure intervention was built to measure the pressure data of each sealing chamber of the non-contact labyrinth seal under d

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32

Shyu, Shiuh Hwa, and Yu Wei Chen. "Dynamic Characteristics of Rotor-Bearing System with a Labyrinth Seal." Key Engineering Materials 739 (June 2017): 169–81. http://dx.doi.org/10.4028/www.scientific.net/kem.739.169.

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In this paper, the dynamic characteristics of rotor-bearing system with a labyrinth seal are investigated. The dynamic coefficients of labyrinth seal and the whirl speeds of rotor-bearing system are analyzed. The simplified rotor-bearing model consists of a rigid disk and a flexible shaft. The rotor-bearing system supported by two ball bearings, which are modeled as the spring-damper systems. A labyrinth seal supports one of the rigid disks. The perturbation approach has been applied to the governing equations of the bulk-flow model to calculate the dynamic coefficients of labyrinth seal. The

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33

Tisarev, Andrei, Sergei Falaleev, and Alexandr Vinogradov. "Calculation of Labyrinth Seals in the Secondary Air System of Aircraft Engine." Open Mechanical Engineering Journal 8, no. 1 (2014): 424–30. http://dx.doi.org/10.2174/1874155x01408010424.

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The labyrinth seals perform the important functions in the aircraft engine systems operation, which aim to reduce the air leakages and the mutual system interference reduction. The calculation of the labyrinth seal characteristics is performed simply by using the analytical relationships or the modern tools of numerical analysis. However, the seal operation specificity within the system of operating engine secondary streams imposes some additional difficulties manifested in the rotor and stator elements deformation forming a gap. In this paper, we analyzed the formation cases of axis symmetric

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34

Jiang, Jie, Yi Yong Yang, Yong Jian Li, and Wei Feng Huang. "Influence of Gas Condensability on Labyrinth Seal's Sealability." Applied Mechanics and Materials 575 (June 2014): 355–62. http://dx.doi.org/10.4028/www.scientific.net/amm.575.355.

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Labyrinth seals are widely used in rotating fluid machinery, due to its simplicity, low-cost and reliability. In this paper, the effect of cavities on leakage loss in straight-through labyrinth seals are studied by changing gas condensability. The fluid flow characteristics through straight-through labyrinth seals are obtained by using viscous flow analysis along with a RNG k-ε turbulence model. The numerical calculation and various gas pressure is that leakage of compressible gas is greater than that of incompressible gas. The result is investigated by the heating effect of labyrinth seal and

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35

Schramm, V., K. Willenborg, S. Kim, and S. Wittig. "Influence of a Honeycomb Facing on the Flow Through a Stepped Labyrinth Seal." Journal of Engineering for Gas Turbines and Power 124, no. 1 (2000): 140–46. http://dx.doi.org/10.1115/1.1403460.

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This paper reports numerical predictions and measurements of the flow field in a stepped labyrinth seal. The theoretical work and the experimental investigations were successfully combined to gain a comprehensive understanding of the flow patterns existing in such elements. In order to identify the influence of the honeycomb structure, a smooth stator as well as a seal configuration with a honeycomb facing mounted on the stator wall were investigated. The seal geometry is representative of typical three-step labyrinth seals of modern aero engines. The flow field was predicted using a commercia

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36

Nikulchikov, Andrey V., Viktor K. Nikulchikov, Viktor A. Solonenko, Grigoriy R. Ziyakaev, and Evgeniy N. Paskov. "Finite volume model for labyrinth seal in centrifugal compressor." Bulletin of the Tomsk Polytechnic University Geo Assets Engineering 336, no. 6 (2025): 136–44. https://doi.org/10.18799/24131830/2025/6/3678.

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Relevance. To date, an urgent issue in the oil and gas industry is to increase the efficiency and the cost-effectiveness of turbomachines by increasing the efficiency of individual units. One way to improve efficiency is to reduce parasitic gas leaks from the turbomachine body. In conditions of high angular velocities and large pressure drops, non-contact labyrinth seals are used. They are a simple and reliable means of preventing gas leaks, despite their low tightness. During the modernization of the centrifugal turbocharger in production, it became necessary to increase the efficiency of the

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Čížek, Michal, Vojtěch Klír, Pavel Steinbauer, and Tomáš Vampola. "LABYRINTH SEAL CFD CALCULATION AND TEMPERATURE MEASUREMENT INVESTIGATION." Aviation 26, no. 2 (2022): 96–103. http://dx.doi.org/10.3846/aviation.2022.16886.

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This article presents currently obtained results from CFD analysis of the labyrinth seals of an aircraft turbine engine. The process of describing a geometry, grid for numerical calculation and boundary conditions are described. Numerical simulations were performed for the assumed boundary conditions. The presented results show total temperature differences in labyrinth seals compared to published results. An experimental verification of the CFD analysis was also performed to clarify the numerical simulation results. It was based on the labyrinth seal measurement stand. The final part of this

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Kwanka, Klaus. "Dynamic Coefficients of Stepped Labyrinth Gas Seals." Journal of Engineering for Gas Turbines and Power 122, no. 3 (2000): 473–77. http://dx.doi.org/10.1115/1.1287033.

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Rotor-fluid interactions can cause self-excited shaft vibrations of high density turbomachinery. Often the amplitude of the vibrations reaches unacceptably high amplitudes and the scheduled power or running speed cannot be achieved. One of the most important sources of excitation is the flow through labyrinth seals. For a reliable design it is necessary to predict these forces exactly, including not only stiffness but also damping coefficients. As the forces in labyrinth gas seals are rather small only minimal experimental data is available for the comparison and validation of calculations. Me

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Kong, Xiaozhi, Gaowen Liu, Yuxin Liu, Zhao Lei, and Longxi Zheng. "Performance evaluation of the inter-stage labyrinth seal for different tooth positions in an axial compressor." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 6 (2017): 579–92. http://dx.doi.org/10.1177/0957650917739532.

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Labyrinth seals are normally used to control the leakage flow in the compressor stator well. The upstream and downstream rotor-stator cavities of the labyrinth seal can cause complex reverse leakage flows. Remarkable temperature increases and high swirl velocities are observed in this region. In addition, another characteristic of inter-stage labyrinth seal is that large expansions of rotor and stator may easily lead to severely rubbing between the teeth and shrouds, which can shorten the lifetime of the compressor obviously. Experiments were conducted at a rotating compressor inter-stage seal

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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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Жинов, Andrey A., and Denis V. Shevelev. "Determination of steam leaks through faulty labyrinth seals of a steam turbine." Izvestiya MGTU MAMI 16, no. 1 (2022): 21–28. http://dx.doi.org/10.17816/2074-0530-104581.

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BACKGROUND: When calculating the axial force acting on the thrust bearing of a steam turbine, when calculating the dimensions of the unloading piston, when calculating the efficiency of the turbine stages, it is necessary to determine the amount of steam leakage through its diaphragm and end seals. Existing methods make it possible to calculate leaks only through serviceable, undamaged labyrinth seals of several standard designs. However, during the operation of steam turbines, due to off-design axial and radial displacements of the rotor, labyrinth seals are often damaged - deformed, crushed

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Zhang, Hai, Qun Zheng, Guoqiang Yue, and Jie Gao. "Numerical analysis of flows and aerodynamic forces in honeycomb and labyrinth seals." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 227, no. 9 (2012): 1965–79. http://dx.doi.org/10.1177/0954406212470894.

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Rotor dynamics and flow characteristics are computed for a honeycomb seal and a corresponding labyrinth seal. Firstly, rotor dynamic parameters, such as amplitude and frequency of vibration are calculated. Then these parameters are used for unsteady fluid flow computation. Numerical results indicate that the rotor vibration can reduce sealing performance and result in additional aerodynamic force on rotor. Further, the aerodynamic forces tend to reduce the self-excited vibration of rotor, and this effect becomes more apparent with the increase of pressure difference. Vortex in seal cavities is

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Hirano, Toshio, Zenglin Guo, and R. Gordon Kirk. "Application of Computational Fluid Dynamics Analysis for Rotating Machinery—Part II: Labyrinth Seal Analysis." Journal of Engineering for Gas Turbines and Power 127, no. 4 (2005): 820–26. http://dx.doi.org/10.1115/1.1808426.

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Labyrinth seals are used in various kinds of turbo machines to reduce internal leakage flow. The working fluid, or the gas passing through the rotor shaft labyrinth seals, often generates driving force components that may increase the unstable vibration of the rotor. It is important to know the accurate rotordynamic force components for predicting the instability of the rotor-bearing-seal system. The major goals of this research were to calculate the rotordynamic force of a labyrinth seals utilizing a commercial CFD program and to further compare those results to an existing bulk flow computer

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Chupp, R. E., and C. A. Dowler. "Performance Characteristics of Brush Seals for Limited-Life Engines." Journal of Engineering for Gas Turbines and Power 115, no. 2 (1993): 390–96. http://dx.doi.org/10.1115/1.2906721.

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Brush seals are potential replacements for air-to-air labyrinth seals in gas turbine engines. An investigation has been conducted to determine the performance characteristics of brush seals for application in limited-life gas turbine engines. An elevated temperature, rotating test rig was designed and built to test labyrinth and brush seals in simulated subsonic and supersonic engine conditions. Results from initial tests for subsonic applications demonstrated that brush seals exhibit appreciably lower leakage compared to labyrinth seals, and thus offer significant engine performance improveme

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Nengmao, Wang, and Wang Yanrong. "Aeroelastic Stability of Labyrinth Seal with Different Structure Parameters." MATEC Web of Conferences 179 (2018): 01013. http://dx.doi.org/10.1051/matecconf/201817901013.

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Numerical analysis of turbomachinery based on energy method is used to predict the aeroelastic stability of the straight-through labyrinth seal by solving aerodynamic work and damping. The aeroelastic stability of the labyrinth seal under different working conditions and vibration modes has been compared. It's found that the increase of pressure ratio leads to the greater possibility of aeroelastic instability. The periodic distribution of the aerodynamic work in the circumferential direction of the labyrinth seal corresponds to the number of vibrating nodal diameters. In order to investigate

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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, D. W., and J. K. Scharrer. "Experimental Rotordynamic Coefficient Results for Teeth-on-Rotor and Teeth-on-Stator Labyrinth Gas Seals." Journal of Engineering for Gas Turbines and Power 108, no. 4 (1986): 599–604. http://dx.doi.org/10.1115/1.3239953.

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An experimental test facility is used to measure the rotordynamic coefficients of teeth-on-rotor and teeth-on-stator labyrinth gas seals. Direct damping coefficients are presented for these seals for the first time. The results are presented for the two seal configurations at identical operating conditions, and show that, in a rotordynamic sense, the teeth-on-stator seal is more stable than the teeth-on-rotor seal, for inlet tangential velocity in the direction of rotation.

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Ren, H. Y., S. Q. Yang, W. Wu, and X. J. Xie. "Numerical investigation on transient sealing performance of square labyrinth seal in a liquid hydrogen piston pump." IOP Conference Series: Materials Science and Engineering 1327, no. 1 (2025): 012065. https://doi.org/10.1088/1757-899x/1327/1/012065.

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Abstract This paper establishes a two-dimensional transient model of a labyrinth seal that considers the piston’s reciprocating motion to predict transient leakage in a liquid hydrogen piston pump. The sealing performance of a labyrinth seal with square cavities using dynamic mesh techniques to simulate its reciprocating motion is analyzed. The differences between the static and dynamic models, as well as between the labyrinth and clearance seals are numerically compared. The influence of key parameters including piston motion, pressure and geometry on the sealing performance is also examined.

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Sun, Tao, Yi Zhang, Zhong Yi Wang, and Hai Ou Sun. "Numerical Study on Flow Characteristics in Stepped Labyrinth Seal." Advanced Materials Research 230-232 (May 2011): 582–86. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.582.

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Vapor seal is an indispensable component in steam turbine for economic and safe operation. The flow characteristics in vapor seal have a significant effect on the performance of vapor seal. Considering the flow field characteristics and engineering applications, the following work has been done: First, the models of the labyrinth glands with stepped teeth have been established through Computational Fluid Dynamics software Fluent. The full-flow simulation result is acquired. Second, based on the numerical results, the characteristics of the flow field in stepped labyrinth seal have been studied

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50

Joachimiak, Damian. "Method for the reduction of leakage in labyrinth seals by adapting the seal geometry to match the flow conditions." E3S Web of Conferences 323 (2021): 00014. http://dx.doi.org/10.1051/e3sconf/202132300014.

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In this paper a method for reducing leakage in labyrinth seals is presented. This method is based on CFD calculations and consists in the analysis of the phenomenon of gas kinetic energy carry-over in chambers of the seal between gaps. It belongs to the group of geometrical inverse problems and is designed for seals of given outside dimensions. For straight through labyrinth seals it enables determining the number of teeth and their optimal arrangement. This method was developed based on numerical and experimental tests. Examples of numerical calculations presented in this paper prove that thi

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