Scaling Effects on Leakage Losses in Labyrinth Seals

Wittig, Sigmar; Dörr, Lasse; Kim, S.

doi:10.1115/1.3227416

Cited by 41 publications

(23 citation statements)

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“…Labyrinth seals are part of the group of non-contact seals. They are applied in steam and gas turbines and provide simple, but comparatively efficient sealing effect [9][10][11][12]. The labyrinth seals act as an obstacle for the incoming flow of leaks passing through the seal.…”

Section: Introductionmentioning

confidence: 99%

“…A number of research efforts have been performed to find way to improve seals characteristics [11,[22][23][24][25][26]. For instance, various empirical discharge coefficients for investigation of different labyrinth seal geometries and applications are found and applied for research.…”

Section: Introductionmentioning

confidence: 99%

“…The effects of teeth thickness, tooth profile, and eccentric rotor on leakage are being examined through a series of non-rotating tests [11]. It's shown that if one double the teeth thickness thus the mass flow reduces up to 20 %.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Labyrinth seals with application to turbomachinery

Ilieva

Pirovsky

2019

Materialwissenschaft Werkst

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It is well known that there exist losses of fluid through axial and radial gaps in turbomachines, leading to less efficiency. Every 1 % decrease in leakage flow through a high‐pressure gas turbine seals would result in a 0.4 % decrease in the specific fuel consumption [1]. Last decades, a number of solutions have been applied to overcome losses of fluid through axial and radial gaps. A feasible solution is the application of labyrinth seals to act as an obstacle on the way of flow leakages. This research is targeted to attain a seal configuration that has good dynamic sealing properties, higher compliance with the shaft, simple geometry for manufacturing and maintenance. The labyrinth seal must produce significant losses of kinetic energy in order to stop leaks passing through the sealed places. It is known that the turbine shaft exhibits modal and stress loads. Also, seals must be designed to resist loads and operate at maximum efficiency. The fulfilled numerical analysis shows that the proposed geometry causes intensive reduction of leakage flow rates and thus contributes to increase in the efficiency performance of stages under consideration.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Labyrinth seals with application to turbomachinery

Ilieva

Pirovsky

2019

Materialwissenschaft Werkst

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“…Predicting leakage flow in labyrinth seals dates back to Vermes [1] in the early 1960s. Since then, other efforts have been made to accumulate test data [2][3][4] and to construct performance prediction tools based on experimental data [4-,6]. Despite those efforts, simple analytic models to satisfactorily predict performances of wide variants of seal configurations remain difficult to set up.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of the influence of labyrinth seal configuration on leakage behavior

Kim

Sang

2009

J Mech Sci Technol

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This study analyzed the influence of configuration and clearance on the leakage behavior of labyrinth seals. Both computational fluid dynamics (CFD) and an analytical tool were used to predict the leakage flow of two different (straight and stepped) seal configurations with various clearances. The predicted results were compared with experimental data. The CFD gives a better agreement with the experimental result than the analytical model on average. In the straight seal, the dependence of the discharge coefficient on the clearance is considerable, while it is much smaller in the stepped seal. The CFD captures the entire behavior sufficiently well, but the analytical model overpredicts the clearance dependence in the stepped seal. The CFD also predicts well the influence of the flow direction on the leakage flow. The advantage of the stepped seal over the straight seal becomes more evident as the clearance gets larger. As the clearance becomes sufficiently small, the advantage of the stepped seal reduces.

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“…In [10] is presented a fluid mechanics approach to the labyrinth seal leakage problem. Many efforts were performed to reduce the leakage mass flow and to improve seals characteristic, [12,13,14]. In these works are found and applied for research various empirical discharge coefficients for investigation of different labyrinth seal geometries and applications.…”

Section: Introductionmentioning

confidence: 99%

Labyrinth Seals - A Promising and Effective Design

2016

IJSR

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Main task of this study is to fulfill numerical modeling and analysis of a labyrinth seals, which have geometry quite different than the ones applied up to now. The challenge was to arrive to a design for a seal that has good sealing properties, ease manufacturing, can sustain higher stress loading and perform increased loss of kinetic energy, as the idea is to stop the leaks. The fulfilled numerical analysis shows that the proposed geometry leads to high decrease of leakage flow rates and thus contributes to possibility to increase the efficiency performance of turbine stages as part of a propulsion system.

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Scaling Effects on Leakage Losses in Labyrinth Seals

Cited by 41 publications

References 0 publications

Labyrinth seals with application to turbomachinery

Labyrinth seals with application to turbomachinery

Comparative analysis of the influence of labyrinth seal configuration on leakage behavior

Labyrinth Seals - A Promising and Effective Design

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