Leakage performance of labyrinth seal for oil sealing of aero-engine

Li, Guoqing; Qian, Zhenghong; Lei, Zhijun; Huang, Enliang; Wu, Hongwei; Xu, Gang

doi:10.1016/j.jppr.2018.12.003

Cited by 14 publications

(2 citation statements)

References 12 publications

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“…The geometry of the rotor and teeth is a crucial factor affecting the sealing performance. For example, Li et al showed in their experimental study that the thickness of the tooth tip, the number of teeth, and the angle of the teeth are critical for better leakage performance [5]. Mortazavi and Palazzolo predicted the rotor-dynamic performance of a smooth stator-grooved rotor using computational fluid dynamics (CFD) analysis [6].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Pressure ratio is another vital factor that affects leakage in annual seals. One study found that an increase in the pressure ratio in annual seals would lead to a decrease in leakage [28]. Li et al [29] further studied the influence of the pressure ratio on the leakage characteristics of the improved annual seal structure (PDS), and the results showed that the leakage flow increased with the decrease in the pressure ratio under the condition of constant inlet pressure.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Leakage Characteristics of Combined Seal Structure under Rotational Conditions

Zhang

et al. 2022

Sustainability

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In order to reduce fluid leakage and improve the working efficiency of rotational machinery, a three-dimensional (3D) model of combined seal structure (CSS) was established to study the influence of pressure ratio (π, the ratio of the leakage port pressure to the outlet pressure) and rotational speed (n) on the leakage characteristics of CSS with a traditional labyrinth seal structure (LSS) and pocket damping seal structure (PDS) under rotational conditions. Two turbulence models, the standard k-ε model and the SST k-ω model, were used for turbulence closure and the results of the standard k-ε model were found to be more accurate based on comparison with experimental results. The results revealed that under rotational condition, the leakage rates of LSS, CSS and PDS all decreased with the increase in π and n. Under the same axial length of seal structure and π of 0.5 and n of 6000 r/min, the leakage rate of CSS is approximately 8.56% less than LSS, and approximately 0.51% more than PDS. There is a critical value for the influence of n on the leakage rate. The critical n of CSS is close to that of LSS, about 1000 r/min, which is greater than the critical n of 500 r/min for PDS. Finally, the sealing mechanism of CSS was studied using a two-dimensional (2D) model, and was found that the jet structure has a greater influence on the sealing characteristics. Among them, when the ΔP (internal resistance of the device) is the same, the shape of the jet structure, the position of the guide tube and the nozzle radius have a greater impact on the leakage rate, and the shape and length of the extended section have a small effect on the leakage rate.

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Numerical investigation on the effects of HC geometry on the flow and heat transfer in the disk cavity system at the turbine vane root

Yao

et al. 2023

Applied Thermal Engineering

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Leakage performance of labyrinth seal for oil sealing of aero-engine

Cited by 14 publications

References 12 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

Simulation of Leakage Characteristics of Combined Seal Structure under Rotational Conditions

Numerical investigation on the effects of HC geometry on the flow and heat transfer in the disk cavity system at the turbine vane root

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