Experimental identification of fluid-induced force in labyrinth seals

Zhang, Wan Fu; Yang, Jian; Cao, Hao; Sun, Daofeng

doi:10.1007/s12206-011-0419-7

Cited by 5 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first model is based on Hirano's compressor eye seal [21]. The second model is based on our previous experimental labyrinth seal [22].…”

Section: Numerical Modelmentioning

confidence: 99%

Influence of tilting rotor on characteristics of fluid-induced vibration for labyrinth seals

Zhang¹,

Zhang²,

Yang³

et al. 2016

J. vibroeng.

View full text Add to dashboard Cite

Labyrinth seal is a key component for the safe and reliable operation of a turbine unit. This paper sets up a three-dimensional numerical model of a labyrinth seal with a tilting rotor based on a compressor eye seal which was studied by Computational Fluid Dynamics method and a test labyrinth seal. The influence of the tilting rotor on the static and dynamic characteristics of labyrinth seals was investigated. Numerical results demonstrated a good agreement with the published article. Both the radial and tangential fluid-induced forces show an obvious increase when the rotor is in tilting conditions. From an efficiency viewpoint, a bigger tilt angle of the rotor is desirable. And eccentricity existence is not beneficial to the seal performance. The results based on the test seal show the whirl frequency ratio increases with the increasing eccentricity ratio. In case of tilting conditions (= 0.05 mm, = 0.8 deg), the whirl frequency ratio decreases with the increasing rotational speed. The higher rotational speed will be beneficial to the stability improvement when the rotor is in tilting conditions. The whirl frequency ratio also shows a decrease with the increasing inlet pressure. The higher inlet pressure tends to improve the stability when the rotor is in tilting conditions. All the stiffness coefficients and damping coefficients increase as the tilt angle increases. The whirl frequency ratio also shows an increase with the increasing tilt angle. The tilting rotor tends to reduce the stability when the rotor is in eccentric conditions.

show abstract

“…The first model is based on Hirano's compressor eye seal [21]. The second model is based on our previous experimental labyrinth seal [22].…”

Section: Numerical Modelmentioning

confidence: 99%

Influence of tilting rotor on characteristics of fluid-induced vibration for labyrinth seals

Zhang¹,

Zhang²,

Yang³

et al. 2016

J. vibroeng.

View full text Add to dashboard Cite

show abstract

“…This is designed in terms of the condition of our previous test rig. 26 Figure 4 shows the boundary conditions defined for the conventional LS and the RAS. The calculation assumes the fluid to be an ideal gas at constant temperature and the entire flow to be turbulent.…”

Section: Numerical Modelmentioning

confidence: 99%

“…To validate the simulation approach and solver settings, validation was carried out against our previous experimental work reported in the literature. 26 The test rig and seal dimensions are shown in Figure 6. There are, in total, six sets of seals in the rig.…”

Section: Validation Of Cfd Model Against the Published Literature Resmentioning

confidence: 99%

Research on the leakage and dynamic characteristics of a new kind of radial annular seal and comparisons with labyrinth seals

Zhang

Yang

Tian

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

To minimize fluid leakage and improve rotordynamic stability of traditional seals, a new kind of radial annular seal is presented in this article. The structure and the sealing principle are analyzed. Compared to the traditional labyrinth seal, the fluid leakage direction is altered from the axial to radial direction. The flow resistance is increased, and the flowinduced force is reduced greatly. There is also a tremendous improvement in the wear resistance of the seal. Threedimensional numerical models of the traditional labyrinth seal and radial annular seal are set up. Calculated results show that the discharge coefficient of the radial annular seal is about 20% lower than that of the labyrinth seal. Though the rotating speed has a small influence on the radial seal force for both the radial annular seal and labyrinth seal, it has a large effect on the tangential seal force. The tangential seal force increases with the increasing speed, and the destabilizing force in the radial annular seal is reduced greatly when compared to that in the labyrinth seal. The radial seal force of the radial annular seal is about 1.5-2.5 times as strong as that of the labyrinth seal. The tangential seal force is about 30-50% lower than that of the labyrinth seal under the same eccentricity, and this ratio becomes larger and larger with the increasing speed. Finally, the dependency of the seal characteristics on the design parameters is studied. It is shown that the optimum ratios of the clearance s to the tooth thickness b (s/b) for the outward and inward flows are 4.5-5.5 and 11-13, respectively. The flow characteristics perform best with the ratio of the seal chamber width B to the tooth height H (B/H) on the same order of 5.5-7 for the two kinds of flows.

show abstract

“…Given the uncertainty surrounding both the expected leakage and rotordynamic performance of the floating bushing seals, a number of other seal technologies were also explored for their viable use with the GEL bearing test rig. These seals included lip seals [122,123], labyrinth seals [124][125][126][127][128][129][130][131][132][133][134], a variety of annular seals including bushing, ring, honeycomb, and hole pattern seals [135][136][137][138][139][140][141][142][143][144][145][146], centrifugal motion seals [47,147,148], and mechanical seals [149][150][151][152][153][154][155][156][157][158][159][160][161][162][163]. However, these sealing technologies also faced a number of technical hurdles to being implemented in GEL environments including Hence, after considering the uncertainty surrounding the cu...…”

Section: Bearing Sealsmentioning

confidence: 99%

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

Weaver¹

View full text Add to dashboard Cite

Experimental identification of fluid-induced force in labyrinth seals

Cited by 5 publications

References 21 publications

Influence of tilting rotor on characteristics of fluid-induced vibration for labyrinth seals

Influence of tilting rotor on characteristics of fluid-induced vibration for labyrinth seals

Research on the leakage and dynamic characteristics of a new kind of radial annular seal and comparisons with labyrinth seals

Gas-Expanded Lubricants for Increased Energy Efficiency and Control in Rotating Machinery

Contact Info

Product

Resources

About