Leakage Characteristics of Rotating Stepped Labyrinth Seals

Miyake, Kunihiro; Ariga, Ichiro

doi:10.1299/kikaib.51.1975

Trans.JSME, Ser.B

1985

DOI: 10.1299/kikaib.51.1975

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Leakage Characteristics of Rotating Stepped Labyrinth Seals

Kunihiro Miyake¹,

Ichiro Ariga²

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Cited by 3 publications

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Phenomenon of labyrinth seal with low static pressure difference and large clearance

Shimada

Kimura

Ichikawa

et al. 2004

J Vis

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This paper discusses the straight-through type labyrinth seal. This labyrinth seal is used for axial flow fans, which have an outer ring at the blade tip to seal the clearance between the ring tip and the fan shroud, in order to prevent the reverse flow or leakage. These fans are used for the cooling of automobile radiators. In these cases, the labyrinth seal is used in an extremely low static pressure difference and a large clearance. A significant decrease of the leakage rate was reported even when the labyrinth seal rotated in comparatively low speed in this unique condition according to the authors' former report. However, this phenomenon is different from past research. Furthermore the cause of this phenomenon has not been determined. Therefore, the internal flow was depicted with Computational Fluid Dynamics (CFD) in order to clarify the cause of this phenomenon. The results of CFD show that the leakage rate decreases significantly because the carry-over flow is intercepted in the expansion groove. This is the newly discovered phenomenon which occurs under the unique condition of an extremely low differential pressure. It has not been pointed out before as the reason why the rotation decreases the leakage rate.

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Phenomenon of labyrinth seal with low static pressure difference and large clearance

Shimada

Kimura

Ichikawa

et al. 2004

J Vis

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Effect of lateral misalignment on performance of a stationary and rotating labyrinth seals

Saber

Abdou

2019

Alexandria Engineering Journal

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Influence of radial labyrinth seal on pump performance

Kanemori¹,

Handa²

2020

Transactions of the JSME (In Japanese)

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Labyrinth seals have been used as non-contacting sealing devices for rotors such as on turbo machines. In recent years, an improvement of the sealing performance of labyrinth seals has been required due to the increasing pressure of turbo machines. In this paper, it is suggested that new type pump labyrinth seals (Radial labyrinth type) have high sealing performance on pump wear rings in the radial direction of fundamental labyrinth grooves seals. This study was carried out by CFD analysis. First, radial labyrinth seals were tested in an actual double suction pump. Subsequently, it became clear that pump radial labyrinth seals have an effect of increasing pump efficiency by reducing leakage compared to general plain wear ring seals. It was also confirmed by various experiments that the radial labyrinth seals have the effect of increasing pump suction specific speed. Furthermore, it was demonstrated that the rotor-dynamics coefficients of radial labyrinth seals are smaller than plain seals.

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Leakage Characteristics of Rotating Stepped Labyrinth Seals

Cited by 3 publications

References 0 publications

Phenomenon of labyrinth seal with low static pressure difference and large clearance

Phenomenon of labyrinth seal with low static pressure difference and large clearance

Effect of lateral misalignment on performance of a stationary and rotating labyrinth seals

Influence of radial labyrinth seal on pump performance

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