Effects of Increased Tooth Clearance on the Performance of a Labyrinth Seal With Oil-Rich Bubbly Laminar Flow

Zhang, Min; Childs, Dara W.

doi:10.1115/1.4051914

Cited by 5 publications

(1 citation statement)

References 22 publications

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“…The findings revealed that the labyrinth seal leaked the least when the seal clearance was between 0.5 and 1 mm. Zhang and Childs [9] used an annular seal test system to see how much a long labyrinth seal leaked when it was working in a wet gas environment. The findings demonstrated that there was a correlation between the volume fraction of the liquid phase in the inlet mixed medium and the rate of leakage, which showed a steady increase.…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural Parameters of Gearbox Seal System of Electrical Multiple Units on Seal Performance

Shen,

Zhu,

Shao

et al. 2024

Mathematical Problems in Engineering

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The gearbox seal system is a critical component of the electrical multiple units drive system, with a direct impact on the safety and reliability of train operations. This study intends to analyze how structural parameters of the gearbox seal system influence the seal performance from the viewpoint of “oil–air separation and scavenge oil” by using a discrete phase model and volume of fluid. The results show that the oil–air separation performance is mainly affected by the oil droplets’ inertia force and the airflow traction force, and the scavenge oil performance is decided by the oil–air separation performance of each seal chamber. The relationships between seal chamber size, axial seal clearance width, height difference, scavenge oil hole diameter, and seal performance are analyzed, and the study also found that optimizing the stator chamber depth–width ratio of the seal system studied in this paper at 2.5, reducing the rotor chamber depth–width ratio and axial seal clearance width, and increasing the relative height difference can improve the seal performance. And increasing the scavenge oil hole diameter also enhances the seal system’s performance. The simulation results can be used as design references for gearbox seal systems.

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Section: Introductionmentioning

confidence: 99%

Influence of Structural Parameters of Gearbox Seal System of Electrical Multiple Units on Seal Performance

Shen,

Zhu,

Shao

et al. 2024

Mathematical Problems in Engineering

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Performance of a Long Smooth Multiphase Pump Seal in Different Flow Regimes

Zhang¹,

Childs

2021

Journal of Engineering for Gas Turbines and Power

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Behaviors of a Hole-Pattern Seal With Wet-Gas

Zhang¹,

Childs

2021

Journal of Tribology

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Hole-pattern (HP) seals are widely used in centrifugal compressors to control leakage. This paper investigates the behaviors of an HP with wet-gas mixtures. The mixture consists of oil and air with inlet liquid volume fraction (LVF) up to 8%. Injecting oil into the air stream increases the leakage mass flowrate. Direct stiffness K is frequency-dependent and increases with increasing excitation frequency Ω. Injecting oil into the airflow makes this stiffening effect more pronounced. At low frequencies, increasing inlet LVF shows no appreciable impact on K; however, as Ω increases, the effects of changing LVF become more pronounced; i.e., at high frequencies, increasing LVF increases K. The effective damping Ceff value at half of the running speed is indicative of the system stability because many compressor rotors frequently show instabilities at ∼50% of the running speed. At 50% of the running speed, Ceff is positive, and it increases with increasing inlet LVF. Predictions based on San Andrés's (2011) homogenous-mixture bulk-flow model show a good agreement with test results for leakage mass flowrate, K, and the Ceff value near 50% of the running speed. When Ω = 0.5ω, the predicted value of Ceff is smaller than the measured value by ∼12.5%, giving a safe margin for the compressor design.

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Effects of Increased Tooth Clearance on the Performance of a Labyrinth Seal With Oil-Rich Bubbly Laminar Flow

Abstract: See the paper

Cited by 5 publications

References 22 publications

Influence of Structural Parameters of Gearbox Seal System of Electrical Multiple Units on Seal Performance

Influence of Structural Parameters of Gearbox Seal System of Electrical Multiple Units on Seal Performance

Performance of a Long Smooth Multiphase Pump Seal in Different Flow Regimes

Behaviors of a Hole-Pattern Seal With Wet-Gas

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