Effects of tooth bending damage on the leakage performance and rotordynamic coefficients of labyrinth seals

Chen, Yaoxing; Li, Zhigang; Li, Jun; Yan, Xin

doi:10.1016/j.cja.2019.12.004

Cited by 22 publications

(5 citation statements)

References 17 publications

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“…This implies that the vena contracta effect was reduced with deformation in the Type 1 seal. Using CFD analysis, Chen et al showed that an increase in the gap caused by the bending of the sealing teeth reduced the vena contracta effect [9]. Although the direction of tooth bending in this study differed from that in the previous study, the same phenomenon was predicted in the results of this study.…”

Section: Discussionsupporting

confidence: 60%

“…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]. This study investigated the deformation of the sealing teeth of a labyrinth seal according to its material and geometry using the FE analysis computer simulation method for structural analysis.…”

Section: Discussionmentioning

confidence: 99%

“…This phenomenon is called the vena contracta effect, which increases the flow resistance and helps prevent leakage of the inner fluid. Therefore, the vena contracta effect is an important factor in the performance of labyrinth seals [9,27,28].…”

Section: Discussionmentioning

confidence: 99%

“…This study has several limitations. Damage to the sealing teeth is generally caused by repeated compression and rubbing [9,26,30]. Thus, the deformation shape of the sealing teeth under repeated loads can differ from that of an instantaneous load.…”

Section: Discussionmentioning

confidence: 99%

“…These studies showed that the improvement of the oil leakage performance was predicted in the labyrinth seal with a flexible system compared with a conventional seal without a flexible system. Chen et al investigated the effects of tooth-bending damage on the leakage performance of labyrinth seals and demonstrated increased leakage after toothbending damage using CFD analysis [9]. However, no studies have investigated the sealing performance of flexible and conventional labyrinth seals considering the deformation of the sealing teeth.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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: Discussionsupporting

confidence: 60%