... (0.1 mm, 0.25 mm) are optimized when the axial length of labyrinth seal is limited. The optimization results show that the leakage rate of the optimized labyrinth seal with two gaps is 19.67% and 23.80% lower than the reference labyrinth seal, respectively. It is found that the decrease of fin height...

... of rotor speed, supply pressure and wear on brush seals performance. In the second part of this work, the results obtained for air are compared to data from the literature, using the equivalent effective clearance. Then, another approach is used for estimating the leakage rate of brush seals by considering...

.... hole-pattern seal oil/air mixtures wet-gas compression rotordynamic coefficients leakage Proceedings of ASME Turbo Expo 2022 Turbomachinery Technical Conference and Exposition GT2022 June 13-17, 2022, Rotterdam, The Netherlands GT2022-83504 NEGATIVE CENTERING FORCES OF WET-GAS HOLE-PATTERN SEALS...

... Abstract Understanding the leakage and rotordynamic performance of a hole-pattern annular seal is critical to the design of a centrifugal pump regarding vibration characteristics and stability. The growing interest in 2-phase pumping, handling gas components in the oil stream directly, brings...

... leakage is roughly up to 26% larger than the HCS leakage, while the 20-blade LS leaks in between both. The comparison of results shows the LS has insignificant forces compared to those from the HCS and FPDS, both producing a comparable C eff and similar crossover frequencies ( C eff > 0). The HCS...

... different flow Subscripts X, and Y directions of the coordinate system conditions. X, Y gas component g liquid component Keywords: smooth seal, multiphase pump, flow regime, l rotordynamic coefficients, leakage Acronyms gas volume fraction NOMENCLATURE GVF C direct damping [FT/L] c cross-coupled damping [FT...

...% but barely changes the test seal’s rotordynamic coefficients; i.e., the increased tooth clearance would not change the pump vibration performance. labyrinth seal tooth clearance oil-air mixtures multiphase pump rotordynamic coefficients leakage Proceedings of ASME Turbo Expo 2021...

... coefficients. Keywords: Smooth Seal, Two-Phase Flow, Mainly Gas, Rotordynamic Coefficients, Leakage. NOMENCLATURE c Cross-coupled damping coefficient [FT/L] C Direct damping coefficient [FT/L] Ceff Effective damping [FT/L] Cij Damping coefficients [FT/L] Cr Seal s radial clearance [L] D Seal s inner diameter...

... Abstract The labyrinth seal is one of the most popular non-contact annular seals used in centrifugal compressors to improve machine efficiency by reducing the secondary flow leakage. Reducing the radial clearance C r can effectively decrease the seal’s leakage and therefore increase...

... to pure-gas conditions. Zhang et al. (2019) conducted a comprehensive experimental study on the performance (leakage and rotordynamic coefficients) of a see-through labyrinth seal under mainly-gas conditions. This paper continues Zhang et al.’s (2019) research and studies the performance of the see...

... 23 02 2010 The study deals with optimization of leakage and rotordynamic characteristics of liquid annular seals. A nonlinear constrained multi-objective optimization problem is considered. An objective function is a weighted sum of leakage and whirl-frequency ratio of the seal. Side...

... expansion, misalignment, and application, to allow correct fitment of the strip seals. Any increase in leakage raises the cost due to an increase in the cooling air use, which is linked to specific fuel consumption, and it can also alter gas flow paths and performance. The narrow path within the seal...

... 05 02 2009 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...

... 25 11 2008 Advanced brush and finger seal technologies offer reduced leakage rates over conventional labyrinth seals used in gas turbine engines. To address engine manufactures’ concerns about the heat generation and power loss from these contacting seals, brush, finger, and labyrinth...

... with the combustor-to-turbine transition he slashface gap, a gap between two vane segments e platform, are addressed. An n-factorial study is ntify the importance of such effects on aerodynamic DS: endwall, contouring, nozzle, secondary flows, r, turbine vane, leakage, film cooling LATURE foil chord length ial chord...

... Seal Nozzle Guide Vanes (NGVs) Leakage Sealing of components where there is no relative motion between the elements concerned remains a significant challenge in many gas turbine engine applications. Loss of sealing and cooling air from the internal air system through seals impacts...

... Labyrinth Seal Unworn and Worn Honeycomb Lands Leakage The objective of this study was to develop a Computational Fluid Dynamics (CFD) based methodology to obtain the flow characteristics of worn and unworn labyrinth seals which will be applicable over a wide range of seal geometries...

... 23 09 2008 The turbomachinery component of interest in this paper, the pocket damper seal, has the dual purpose of limiting leakage and providing an additional source of damping at the seal location. The rotordynamic coefficients of these seals (primarily the direct stiffness...