Optimizing the Geometric Parameters of a Straight-Through Labyrinth Seal to Minimize the Leakage Flow Rate and the Discharge Coefficient

Baek, Seung Il; Ahn, Jeongmin

doi:10.3390/en14030705

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Computer simulations, including FE and CFD analyses, have been used to investigate the fluid flow, leakage, deformation, and damage of labyrinth seals in previously published studies [23][24][25][26][27]. The gap size and flow characteristics are critical factors for the performance of a labyrinth seal [9,23,28,29].…”

Section: Discussionmentioning

confidence: 99%

Oil-Sealing Performance Evaluation of Labyrinth Seal Using Combined Finite Element Analysis and Computational Fluid Dynamics

Park,

Son,

Choi

et al. 2023

Lubricants

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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) analyses. Three-dimensional FE models of the rotor and oil deflectors were developed, and the plastic deformation of the teeth of the labyrinth seals was predicted when the rotor impacted the sealing teeth during turbine operation. The oil leakage was predicted using CFD analysis. The results indicated that the Type 3 seal, including movable teeth, is beneficial in preventing leakage and tooth deformation compared with the other types. The Type 2 seal is advantageous because it results in a smaller increase in gap size and greater vena contracta effects than the Type 1 seal. The results of this study could be helpful when designing and selecting the teeth of a labyrinth seal.

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Section: Discussionmentioning

confidence: 99%

Oil-Sealing Performance Evaluation of Labyrinth Seal Using Combined Finite Element Analysis and Computational Fluid Dynamics

Park,

Son,

Choi

et al. 2023

Lubricants

View full text Add to dashboard Cite

show abstract

“…Usage of the CFD flow analysis enables better observation of physical and flow phenomena, which in turn enables designing seals of higher leak tightness. In papers [16][17][18][19][20], the impact of the seal geometric parameters, such as the pitch or the chamber size, on the leakage rate was described. The degree of sealing wear and tear has a considerable impact on the failure of the seal integrity [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Change of the leakage rate by Equation(17) depending on the pressure ratio p in /p out for the initial 8t and the designed geometry 9t of the staggered seal, RC = 0. 542 mm, T in = 300 K, p out = 10 5 Pa.…”

mentioning

confidence: 99%

Novel Method of the Seal Aerodynamic Design to Reduce Leakage by Matching the Seal Geometry to Flow Conditions

Joachimiak

2021

Energies

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This paper presents a novel method of labyrinth seals design. This method is based on CFD calculations and consists in the analysis of the phenomenon of gas kinetic energy carry-over in the seal chambers between clearances. The design method is presented in two variants. The first variant is designed for seals for which it is impossible to change their external dimensions (length and height). The second variant enables designing the seal geometry without changing the seal length and with a slight change of the seal height. Apart from the optimal distribution of teeth, this variant provides for adjusting chambers geometry to flow conditions. As the result of using both variants such design of the seal geometry with respect to leakage is obtained which enables achieving kinetic energy dissipation as uniform as possible in each chamber of the seal. The method was developed based on numerical calculations and the analysis of the flow phenomena. Calculation examples included in this paper show that the obtained reduction of leakage for the first variant ranges from 3.4% to 15.5%, when compared with the initial geometry. The relation between the number of seal teeth and the leakage rate is also analyzed here. The second variant allows for reduction of leakage rate by 15.4%, when compared with the geometry with the same number of teeth. It is shown that the newly designed geometry reveals almost stable relative reduction of leakage rate irrespective of the pressure ratio upstream and downstream the seal. The efficiency of the used method is proved for various heights of the seal clearance.

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Effects of geometric parameters of a staggered labyrinth seal on leakage flow

Chun

Ahn

2023

J Mech Sci Technol

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Optimizing the Geometric Parameters of a Straight-Through Labyrinth Seal to Minimize the Leakage Flow Rate and the Discharge Coefficient

Cited by 6 publications

References 8 publications

Oil-Sealing Performance Evaluation of Labyrinth Seal Using Combined Finite Element Analysis and Computational Fluid Dynamics

Oil-Sealing Performance Evaluation of Labyrinth Seal Using Combined Finite Element Analysis and Computational Fluid Dynamics

Novel Method of the Seal Aerodynamic Design to Reduce Leakage by Matching the Seal Geometry to Flow Conditions

Effects of geometric parameters of a staggered labyrinth seal on leakage flow

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