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Journal articles on the topic 'Labyrinthe radial'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

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

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A fully compressible, two-dimensional axisymmetric, turbulent Navier-Stokes code using the finite-volume discretization approach was utilized to obtain an enhanced understanding of the effects of rub-grooves in straight-through, abradable labyrinth seals. The high-Re form of the k-ε turbulence model was used. The code was first validated against measurements of straight-through honeycomb labyrinths, and accurate results were obtained. It was found that in most of the cases considered (tooth tip outside of its rub groove), the presence of rub-grooves increases the leakage, except for the case o

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2

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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3

Čížek, Michal, Zdeněk Pátek, and Tomáš Vampola. "Aircraft Turbine Engine Labyrinth Seal CFD Sensitivity Analysis." Applied Sciences 10, no. 19 (2020): 6830. http://dx.doi.org/10.3390/app10196830.

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This article presents the labyrinth seal radial clearance influence. A generic labyrinth seal of a turbine aircraft engine was modeled. The target is to compare and analyze the influence of the radial clearance and location of teeth. The results can be useful for designing the location of teeth and their appropriate setting, especially for materials engineering and engineering technology in general.

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4

Čížek, Michal, and Zdeněk Pátek. "ON CFD INVESTIGATION OF RADIAL CLEARANCE OF LABYRINTH SEALS OF A TURBINE ENGINE." Acta Polytechnica 60, no. 1 (2020): 38–48. http://dx.doi.org/10.14311/ap.2020.60.0038.

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Fluid flow in labyrinth seals of a turbine engine is described. The aim is to describe numerical calculations of fluid flow in labyrinth seals and evaluate the calculated data for different settings of radial clearance of labyrinth seals. The results are achieved by 3D CFD detailed simulations in a typical seal geometry. The calculations are performed for different radial clearances at a constant pressure drop. The calculated data are evaluated based on mass flow, static pressure, total enthalpy and total temperature of air. Based on the calculated data, it is visible, that the total temperatu

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5

Das, Saurav, and Hoong Thiam Toh. "Mechanical Growth of Labyrinth Seal." Applied Mechanics and Materials 465-466 (December 2013): 578–81. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.578.

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A preliminary numerical study has been conducted to study the effect of rotational speed on centrifugal growth in a six-tooth straight labyrinth seal. The distribution of the radial deformation along the seal axis for the rotational speed ranging from 100 rpm to 1500 rpm is reported in this paper. The radial deformation which decreases the clearance between the rotating and stationary parts of sealing surface is an indication that centrifugal growth occurs. The results of the simulation indicate that centrifugal growth increases as rotational speed increases. This finding is in qualitative agr

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6

Guelich, J., W. Jud, and S. F. Hughes. "Review of Parameters Influencing Hydraulic Forces on Centrifugal Impellers." Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering 201, no. 3 (1987): 163–74. http://dx.doi.org/10.1243/pime_proc_1987_201_021_02.

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Both radial and axial hydraulic forces act on the impeller of a centrifugal pump. The radial forces are due to three different mechanisms: (a) radial thrust due to non-uniform pressure distribution around the impeller, (b) labyrinth forces and (c) impeller-diffuser interaction forces. The nature, size and origin of these forces are discussed. Steady radial thrust depends on the specific speed of the pump, type of casing (single or double volute, diffuser), geometric parameters and operation conditions including cavitation. The impact of these factors on radial loads is demonstrated and quantit

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7

Szulc, Przemyslaw. "The Application of CFD Methods to Analyse the Flow Structures in the Radial Labyrinth Pump." Applied Mechanics and Materials 630 (September 2014): 52–60. http://dx.doi.org/10.4028/www.scientific.net/amm.630.52.

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The radial labyrinth pump consists of two discs: passive and active. Both discs are equipped in special blades with the opposite angle of milling. The passive disc is motionless and the active one rotates around the axis of the pump. On the surface of the connection of two blades belonging to different discs the circulation of fluid, as a type of energy conversion is expected. To investigate the analysed set of discs and take into consideration the impact of some structural changes of the geometry of both discs on a pump performance the numerical simulations were made. In this paper the result

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8

Liu, L. Y., J. Y. Li, and X. J. Yin. "Experimental Study on the Performance of Constrained Damped Rail Vibration Reduction." Noise & Vibration Worldwide 42, no. 10 (2011): 9–14. http://dx.doi.org/10.1260/0957-4565.42.10.9.

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To study the vibration reduction performance of damped rail, we take the standard rail and labyrinth constrained damped rail as the study target. By testing the vibration performance of both standard rail and labyrinth constrained damped rail in an anechoic room, we use the time-domain analysis to study the vibration changes with time passing. The results showed that: the labyrinth constrained damped rail vibration can effectively reduce the vibration amplitude and duration. Under the radial impact load, compared to the standard rail, vibration acceleration attenuation of the labyrinth constra

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9

LIU, Xingwang. "Research on the Radial Labyrinth of Scroll Compressor." Journal of Mechanical Engineering 48, no. 21 (2012): 97. http://dx.doi.org/10.3901/jme.2012.21.097.

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10

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

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KANEMORI, Yuji, and Yasuo HANDA. "Influence of radial labyrinth seal on pump performance." Proceedings of the Dynamics & Design Conference 2019 (2019): 601. http://dx.doi.org/10.1299/jsmedmc.2019.601.

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12

Kim, N., S. Y. Park, and D. L. Rhode. "Predicted Effects of Shunt Injection on the Rotordynamics of Gas Labyrinth Seals." Journal of Engineering for Gas Turbines and Power 125, no. 1 (2002): 167–74. http://dx.doi.org/10.1115/1.1520539.

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A recent CFD perturbation model for turbomachinery seal rotordynamics was extended for labyrinth shunt injection with an arbitrarily high pressure gas. A large number of measured cases with labyrinth injection pressure at approximately 13.8 bars (200 psi) were computed and compared with measurements. The drastically reduced (negative) cross-coupled stiffness, which is the primary advantage from the use of shunt injection in gas labyrinth seal applications, was well predicted. The agreement with measurements for k, C, and Ceff was within about 40%, 60% and 10%, respectively. In addition, it was

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13

Gyo, Kiyofumi, and Yoshinari Hirata. "Labyrinthine Fistulae Following Radical or Conservative Radical Mastoidectomy." Equilibrium Research 53, no. 2 (1994): 310–14. http://dx.doi.org/10.3757/jser.53.310.

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14

Subramanian, Sivakumar, A. S. Sekhar, and B. V. S. S. S. Prasad. "Assessment of Analytical Predictions for Radial Growth of Rotating Labyrinth Seals." International Journal of Turbo & Jet-Engines 35, no. 3 (2018): 265–79. http://dx.doi.org/10.1515/tjj-2016-0041.

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Abstract Radial growth predictions of rotating labyrinth seals are conventionally obtained from one-dimensional analytical models. However, these predictions quantitatively differ within themselves by about 5-500 %. Simulations using three-dimensional finite element method (FEM) are carried out in this paper for a typical labyrinth seal, subjected to high rotational speed and temperature, for a range of radius-to-length ratio of the rotor. Taking the predicted values by FEM as reference, four analytical models are assessed and their errors are quantified. These errors are found to be independe

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15

Gervais, Bertrand. "L’effacement radical." Protée 30, no. 3 (2003): 63–72. http://dx.doi.org/10.7202/006869ar.

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Nous analysons dans cet article L’Attente l’oubli de Maurice Blanchot, tentant de montrer comment s’y articulent les liens de la mémoire et de l’oubli. La métaphore du labyrinthe nous permettra d’illustrer le concept de musement, proposé initialement par C. S. Peirce, et nous servira à comprendre comment des souvenirs peuvent être perdus puis récupérés, si tant est qu’ils puissent l’être. Le narrateur de L’Attente l’oubli est dans une relation presque clinique avec cette femme qu’il veut aider. Or, il doit apprendre, s’il veut récupérer le fil de ses souvenirs, à ne pas écouter ce qu’elle lui

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16

ENACHE, Marius, Razvan CARLANESCU, Andreea MANGRA, Florin FLOREAN, and Radu KUNCSER. "Investigation of Flow through a Labyrinth Seal." INCAS BULLETIN 13, no. 2 (2021): 51–58. http://dx.doi.org/10.13111/2066-8201.2021.13.2.6.

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Growing performance requirements for gas turbines have led to a continuous increase in gas temperature and pressure ratios. Together with the resulting increase in cooling flows, this requires more and more minimization and control of internal gas leaks. To meet future performance goals, the application of a new seal design and an improved understanding of leakage flow characteristics are of particular importance. The air mass flow through a labyrinth seal designed for a low-pressure turbine has been determined both through analytical calculus and CFD modeling. Different radial clearances and

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17

Pfau, A., A. I. Kalfas, and R. S. Abhari. "Making Use of Labyrinth Interaction Flow." Journal of Turbomachinery 129, no. 1 (2004): 164–74. http://dx.doi.org/10.1115/1.2218571.

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It is the aim of this publication to attract the designers attention to the end wall flow interactions of shrouded high pressure turbines. One of the key issues for designing better turbines is the understanding of the flow interactions set up by the presence of labyrinth seals. Those interaction flows are carefully examined in this publication using the control volume analysis and the radial equilibrium of forces acting on streamlines. The consequences on secondary flow development and mixing losses are discussed and quantified. Out of this insight, design recommendations are derived, which a

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18

Benson, John C., Matthew L. Carlson, and John I. Lane. "MRI of the Internal Auditory Canal, Labyrinth, and Middle Ear: How We Do It." Radiology 297, no. 2 (2020): 252–65. http://dx.doi.org/10.1148/radiol.2020201767.

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19

Kirk, R. Gordon. "A Method for Calculating Labyrinth Seal Inlet Swirl Velocity." Journal of Vibration and Acoustics 112, no. 3 (1990): 380–83. http://dx.doi.org/10.1115/1.2930519.

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The results of numerous investigators have shown the importance of inlet swirl on the calculated dynamic stiffness and stability of labyrinth seals. These results have not included any calculation of inlet leakage of swirl as a function of complex disk geometry including the sealing conditions of the given seal. This paper outlines a method of calculating the inlet swirl at the entrance of the labyrinth seal by introducing a radial chamber which when added to the axial flow solution allows the prediction of the gas swirl as it flows radially from the stage tip along the disk face inward to the

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20

Sun, Dan, Yan Ting Ai, Wan Fu Zhang, and Jian Gang Yang. "Design of a New Kind of the Radial Annular Seal for the Aeroengine." Advanced Materials Research 621 (December 2012): 326–29. http://dx.doi.org/10.4028/www.scientific.net/amr.621.326.

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To minimize fluid leakage loss and improve rotordynamic stability of traditional aeroengine seals, a new kind of radial annular rim seal (RARS) is presented in this paper. Comparing with the conventional labyrinth rim seal (LRS), the fluid leakage direction is modified from the axial to radial direction. The flow resistance increases, and the flow-induced force is greatly reduced. The completed three-dimensional CFD model between RARS and LRS were employed to analyze the inherent characteristics of the fluid flow in the whole passage. Calculated results show that RARS has less leakage and flui

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21

Sun, Huifang, Yue Lv, Jinbing Ni, Xianyu Jiang, and Zhengwei Wang. "Effect of Seal Locations of Pump-Turbine on Axial Hydraulic Trust." Journal of Marine Science and Engineering 9, no. 6 (2021): 623. http://dx.doi.org/10.3390/jmse9060623.

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Axial hydraulic thrust is an important factor that affects safety and stability of pump turbine operation. Research and analysis of axial hydraulic thrust is of a great significance for guiding the safe and stable operation of a pumped storage power station. Since the runner shape of the pump turbine is flat and its radial dimension is large, an increase of leakage can happen easily. In order to reduce the leakage and improve the efficiency of the unit, a labyrinth ring seal is usually used in the upper crown and lower ring of the runner because the inner clearance of the seal has a great infl

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22

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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23

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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24

Oleksandr, Moloshnyi, and Szulc Przemyslaw. "The investigation of the cavitation processes in the radial labyrinth pump." Open Engineering 8, no. 1 (2018): 322–28. http://dx.doi.org/10.1515/eng-2018-0034.

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Abstract The paper concerns the analysis of the cavitation processes in the flow passages of the radial labyrinth pump. The object of the analysis contains the active (moving) and the passive (stationary) discs with straight channels trajectory and semi-circular cross-section. The conversion of the mechanical energy into hydraulic based on the exchange of the momentum between the liquid remaining in the moving and the stationary areas of the discs as well as on the centrifugal increase of the moment of momentum. The analysis of the cavitation processes was realized by the experimental research

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25

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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26

Liu, Gaowen, Xiaozhi Kong, Yuxin Liu, and Qing Feng. "Effects of rotational speed on the leakage behavior, temperature increase, and swirl development of labyrinth seal in a compressor stator well." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 13 (2016): 2362–74. http://dx.doi.org/10.1177/0954410016664929.

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The stator well in a compressor is the space between the rotor and stator inside the mainstream annulus flow. Labyrinth seals are normally used to control the internal flow in the stator well. The upstream and downstream rotating cavities of the labyrinth seal can lead to substantial temperature rise and swirl development in this region. Additionally, due to the centrifugal expansion and thermal expansion, the tip clearance of labyrinth seal changes dramatically at different rotational speeds and temperatures in the stator well. A test rig capable to establish different rotational speeds and p

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27

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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28

Morrison, G. L., M. C. Johnson, and G. B. Tatterson. "3-D Laser Anemometer Measurements in a Labyrinth Seal." Journal of Engineering for Gas Turbines and Power 113, no. 1 (1991): 119–25. http://dx.doi.org/10.1115/1.2906518.

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The flow field inside a seven-cavity labyrinth seal with a 0.00127-m clearance was measured using a 3-D laser-Doppler anemometer system. Through the use of this system, the mean velocity vector and the entire Reynolds stress tensor distributions were measured for the first, third, fifth, and seventh cavities of the seal. There was one large recirculation region present in the cavity for the flow condition tested, Re = 28,000 and Ta = 7000. The axial and radial mean velocities as well as all of the Reynolds stress terms became cavity independent by the third cavity. The azimuthal mean velocity

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29

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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30

Zhang, Enjie, Yinghou Jiao, and Zhaobo Chen. "Effect of Radial Growth on Rotordynamic Characteristics of Labyrinth Seal-Rotor System." Journal of Aerospace Engineering 32, no. 4 (2019): 04019043. http://dx.doi.org/10.1061/(asce)as.1943-5525.0001010.

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31

Lai, Ming-Tang, Takuya Ohmichi, Kentaro Egusa, Satoshi Yoreane, and Yu Masuda. "Immunohistochemical Localization of Manganese Superoxide Dismutase in Rat Vestibular Dark Cell Regions." Annals of Otology, Rhinology & Laryngology 106, no. 1 (1997): 69–74. http://dx.doi.org/10.1177/000348949710600112.

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A modified immunoglobulin peroxidase bridge sequence method was used to detect the localization of manganese superoxide dismutase (MnSOD), a superoxide radical (O2−) scavenging enzyme locating in mitochondrial matrix, in the vestibular labyrinth of pigmented rats. Strong positive MnSOD immunostaining was demonstrated in the dark cell regions of the ampullae, utricle, and common crus. The result provides for the first time direct evidence demonstrating the existence of mitochondrial O2− scavengers in the vestibular labyrinth and illustrates that the specific sites for vestibular MnSOD immunoloc

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32

Rhode, D. L., S. J. Hensel, and M. J. Guidry. "Labyrinth Seal Rotordynamic Forces Using a Three-Dimensional Navier-Stokes Code." Journal of Tribology 114, no. 4 (1992): 683–89. http://dx.doi.org/10.1115/1.2920936.

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A finite difference method for determining rotordynamic forces on an eccentric whirling labyrinth cavity has been developed. A coordinate-transformation was applied to the Reynolds time-averaged Navier-Stokes equations in order to use the modified bipolar coordinate system. The SIMPLER algorithm with QUICK differencing and the high Reynolds number k–ε turbulence model are used to compute the complex turbulent flowfield. A circular whirl orbit about the geometric center of the housing was specified for simplicity. The new model was tested against the rotordynamic force measurements, and close a

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33

Makhsitaliev, Mukhammadbobur, Jamolbek Djuraev, Shokhimardon Khodjanov, Abdurasul Botirov, and Nozim Akhundjanov. "The Functional State Of The Mucous Membrane Of The Nasal Cavity And Paranasal Sinuses After Radical And Minimally Invasive Surgical Interventions." American Journal of Medical Sciences and Pharmaceutical Research 03, no. 01 (2021): 31–40. http://dx.doi.org/10.37547/tajmspr/volume03issue01-06.

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Improving the effectiveness of treatment of chronic rhinosinusitis (CRS) is a priority task of modern otorhinolaryngology, not only domestic, but also foreign. This interest in the problem is due to the widespread prevalence of this pathology. In different countries, the criteria for accounting for the incidence, algorithms for the diagnosis and treatment of rhinosinusitis differ significantly, and for CRS these differences are more pronounced than for acute. A retrospective analysis of the structure and prevalence of ENT diseases according to inpatient observations for 5 years showed that chr

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34

LIU, Xingwang. "Research on Gas Leakage Pneumatic Thermodynamic Behavior in the Radial Labyrinth of Scroll Compressor." Journal of Mechanical Engineering 51, no. 20 (2015): 201. http://dx.doi.org/10.3901/jme.2015.20.201.

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35

Wei, Yuan, Earl H. Dowell, and Zhaobo Chen. "Numerical Prediction of Impact of Clearance on Rotordynamic Coefficients for Labyrinth Brush Seal." International Journal of Turbo & Jet-Engines 36, no. 1 (2019): 31–43. http://dx.doi.org/10.1515/tjj-2016-0065.

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Abstract The clearance has an obvious influence on the rotordynamic characteristics of brush seals. In order to better know the influence of brush seal on the stability of the rotor bearing system, the rotordynamic coefficients of labyrinth brush seal under different clearance cases and operating conditions are numerically analyzed using CFD RANS solutions coupling with a non-Darcian porous medium model. The results show that at the same geometry parameter the radial force and tangential force will increase when the pressure ratio rises. And when the clearance increases, the direct stiffness d

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36

Lu, Bin, Haijun Xuan, Xiaojian Ma, Fangjun Han, Weirong Hong, and Shaoqiang Zhi. "The Influence of the Axial Rub Added in the Radial Rub on the Wear of the Seal Fins during the High Speed Rub of Labyrinth-Honeycomb Seal." Materials 14, no. 8 (2021): 1997. http://dx.doi.org/10.3390/ma14081997.

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Labyrinth-honeycomb seals are a state-of-the-art sealing technology commonly used in aero-engine interstage seal. The undesirable severe rub between the seal fins and the honeycomb due to the clearance change may induce the cracking of the seal fins. A pervious study investigated the wear of the seal fins at different radial incursion rates. However, due to the axial thrust and mounting clearance, the axial rub between the seal fins and the honeycomb may occur. Hence, this paper focuses on the influence of the axial rub added in the radial rub on the wear of the seal fins. The rub tests result

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37

Shevchenko, Serhii. "ANALYSIS OF THE IMPACT OF SPECIAL CONSTRUCTIONS OF GAP SEALS ON THE DYNAMICS OF CENTRIFUGAL MACHINES." ScienceRise, no. 5 (November 11, 2020): 3–13. http://dx.doi.org/10.21303/2313-8416.2020.001485.

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The object of research: the influence of the design features of special gap seals on the dynamic characteristics of centrifugal machines. Investigated problem: harmonization of the consumption and dynamic characteristics of the seals of the rotors of high-speed machines by applying special design methods. Main scientific results: The mechanism and operating conditions of seals with floating rings are described. It is determined that the most effective from the point of view of dynamic characteristics is the variant of the semi-movable ring. Expressions for determining the condition

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38

Dosemane, Deviprasad, Meera Niranjan Khadilkar, Shreyanshi Gupta, Pooja Nambiar, and Ria Mukherjee. "Double Trouble of Double Fistulae." Biomedicine 41, no. 1 (2021): 163–65. http://dx.doi.org/10.51248/.v41i1.556.

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The complications of attico-antral type of Chronic Suppurative Otitis Media (CSOM) are severe due to underlying bone erosion. We describe a case of a 40-year-old lady with attico-antral CSOM and mastoiditis with a postauricular fistula, who underwent modified radical mastoidectomy with excision of the postauricular cutaneous mastoid fistula. Interestingly, another fistula over the dome of lateral semicircular canal was noted intraoperatively.Few reports of occurrence of postauricular mastoid fistula with a labyrinthine fistula have been documented.

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39

Joachimiak, Damian, and Andrzej Frąckowiak. "Experimental and Numerical Analysis of the Gas Flow in the Axisymmetric Radial Clearance." Energies 13, no. 21 (2020): 5794. http://dx.doi.org/10.3390/en13215794.

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This paper focuses on the analysis of the gas flow in the axisymmetric mini gap bounded by the surface of the top of the labyrinth seal tooth and the surface of the body. It includes the results of experimental research and numerical calculations. Experimental research focused on the analysis of gas flow for six clearance heights in a wide range of pressure drops. Based on this research, we determined the mass flow in the clearance. Using the Saint-Venant equation, we determined the flow coefficient versus the pressure ratio upstream and downstream from the seal. Flow coefficients for various

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40

Rombout, Jan, and Bernard K. H. Pauw. "Radical revision mastoidectomy for chronic otitis media without cholesteatoma: the relevance of excenteration of all rest cells." Journal of Laryngology & Otology 113, no. 8 (1999): 710–13. http://dx.doi.org/10.1017/s0022215100144998.

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AbstractPatients who, despite treatment, suffer persistent chronic otitis media (COM), a radical cavity and a hearing loss of more than 55 decibels for more than five years, can be classified as having an ‘endstage’ COM. It is generally agreed that retained infected residual cell tracts or a too small meatus are common causes for failure of surgery for COM. Radical revision mastoidectomy (RRM) aims to remove all residual cell tracts in the mastoid, in the middle-ear cleft, around the labyrinth and around the Eustachian tube. The mastoid cavity is obliterated with a pedicled muscle flap. Thus t

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Subramanian, Sivakumar, A. S. Sekhar, and B. V. S. S. S. Prasad. "Rotordynamic characterization of rotating labyrinth gas turbine seals with radial growth: Combined centrifugal and thermal effects." International Journal of Mechanical Sciences 123 (April 2017): 1–19. http://dx.doi.org/10.1016/j.ijmecsci.2017.01.033.

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Gordon, M. H., U. M. Kelkar, and M. C. Johnson. "Numerical Investigation of an Improved Gas and Steam Turbine Seal." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 210, no. 6 (1996): 477–79. http://dx.doi.org/10.1243/pime_proc_1996_210_074_02.

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A numerical study has been conducted to assess the viability of a new sealing mechanism for gas and steam turbines. This new static-to-rotating sealing mechanism is mounted on flexible legs which permit radial movement and is designed to take advantage of the hydro-dynamic pressure forces, which result from fluid leaking around the seal, to maintain an ideally small and constant clearance. Relatively simple seal geometries have been numerically tested to find an optimal shape. These results indicate that a substantial sealing improvement (between two and four times less leakage) relative to a

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Romer, Nancy. "The Radical Potential of the Food Justice Movement." Radical Teacher 98 (February 27, 2014): 5–14. http://dx.doi.org/10.5195/rt.2014.78.

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The two main threats to our people and planet are climate change and corporate control of our economy and polity.[1] These enormous and completely intertwined issues will take a mass movement of epic proportions to shift. Time is of the essence as climate, economic and political disasters keep coming, ever gaining in intensity, impoverishing our people while enriching the transnational and national corporations. Agreements like the Trans Pacific Partnership that would further strip national governments of their rights to protect labor and the environments in favor of protecting corporate profi

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Li, Xinyang, Jiangang Yang, and Wanjun Xu. "Research and comparison on the leakage and fluid force between the axial and the radial labyrinth seal." Journal of Mechanical Science and Technology 29, no. 11 (2015): 4611–20. http://dx.doi.org/10.1007/s12206-015-1006-0.

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Mirzamoghadam, A. V., and Z. Xiao. "Flow and Heat Transfer in an Industrial Rotor-Stator Rim Sealing Cavity." Journal of Engineering for Gas Turbines and Power 124, no. 1 (2000): 125–32. http://dx.doi.org/10.1115/1.1400754.

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Flow and heat transfer in the row-1 upstream rotor-stator disk cavity of a large 3600-rpm industrial gas turbine was investigated using an integrated approach. A two dimensional axisymmetric transient thermal analysis using aeroengine-based correlations was performed to predict the steady-state metal temperatures and hot running seal clearances at ISO rated power condition. The cooling mass flow and the flow pattern assumption for the thermal model were obtained from the steady-state two dimensional axisymmetric CFD study. The CFD model with wall heat transfer was validated using cavity steady

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Aiba, Yosuke, Ryuji Sakakibara, Takashi Yamaguchi, and Fuyuki Tateno. "Inner-Ear Symptom May Herald Basilar Artery Occlusion." Case Reports in Neurology 13, no. 1 (2021): 31–34. http://dx.doi.org/10.1159/000511311.

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A 75-year-old Japanese man suddenly experienced right cochlear and vestibular dysfunction. Basilar artery occlusion and silent right cerebellar infarction were identified 3 days later. These were treated with intravenous ozagrel (an antiplatelet agent) and edaravone, a free-radical scavenger. The patient did not develop cerebello-brainstem signs. His first sign most probably reflected a right labyrinthine artery occlusion that heralded, or occurred together with, the basilar artery occlusion. This case highlights the possibility that a sudden inner ear dysfunction may herald a basilar stroke.

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Subramanian, Sivakumar, A. S. Sekhar, and B. V. S. S. S. Prasad. "Influence of combined radial location and growth on the leakage performance of a rotating labyrinth gas turbine seal." Journal of Mechanical Science and Technology 29, no. 6 (2015): 2535–45. http://dx.doi.org/10.1007/s12206-015-0545-8.

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Yang, Jinguang, Feng Zhao, Min Zhang, Yan Liu, and Xiaofang Wang. "Numerical Analysis of Labyrinth Seal Performance for the Impeller Backface Cavity of a Supercritical CO2 Radial Inflow Turbine." Computer Modeling in Engineering & Sciences 126, no. 3 (2021): 935–53. http://dx.doi.org/10.32604/cmes.2021.014176.

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Dawson, M. P., D. W. Childs, C. G. Holt, and S. G. Phillips. "Measurements Versus Predictions for the Dynamic Impedance of Annular Gas Seals—Part I: Test Facility and Apparatus." Journal of Engineering for Gas Turbines and Power 124, no. 4 (2002): 958–62. http://dx.doi.org/10.1115/1.1478075.

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An experimental facility and apparatus are described for measuring the dynamic impedance and leakage characteristics of annular gas seals. The apparatus currently has a top speed of 29,800 rpm and can accommodate seal diameters up to 114.3 mm. The air-supply system can provide up to 13.79 MPa (2000 psi) of pressure at the seal inlet. Test seals are configured in a back-to-back arrangement inside the stator and air enters a central inlet annulus at two opposed radial positions. Labyrinth seals and bleed ports located outboard of each test seal are used to control the pressure drop across the te

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Rajashekhar, Rashmi P., and Vinod V. Shinde. "Management of labyrinthine fistula using Surdille flap." International Journal of Otorhinolaryngology and Head and Neck Surgery 4, no. 1 (2017): 32. http://dx.doi.org/10.18203/issn.2454-5929.ijohns20175516.

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<p class="abstract"><strong>Background:</strong> <span lang="EN-IN">Labyrinthine fistula (LF) is the most common intra-temporal complication of squamosal chronic otitis media represents an erosive loss of endochondral bone overlying the semicircular canals without loss of perilymph. Main treatment of LF is surgical. The aim of our study is to discuss its incidence and sex ratio. The main objective is to describe the audio-vestibular results after closure of labyrinthine fistula by our technique using surdille flap. </span></p><p class="abstract"><st

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