Measurement and Visualization of Leakage Effects of Rounded Teeth Tips and Rub-Grooves on Stepped Labyrinths

Rhode, D. L.; Allen, Brian F.

doi:10.1115/99-gt-377

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…Many of them deal with the optimization of the labyrinth seal. [6][7][8][9][10] Wallis et al 11 tried to control the leakage flow in a turbine by using turning devices. Corsini et al 12,13 investigated the use of profiled endplates at the blade tip and succeeded in changing the orientation of the leakage flow structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of an actively controlled automotive cooling fan using steady air injection in the leakage gap

Azzam

Paridaens

Ravelet

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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International audiencen an axial fan, a leakage flow driven by a pressure gradient between the pressure side and the suction side occurs in the gap between the shroud and the casing. This leakage flow is in the opposite direction to the main flow and is responsible for significant energy dissipation. Therefore, many authors have worked to understand this phenomenon in order to reduce these inherent energy losses. Up to now, most of the studies reported in the literature have been passive solutions. In this paper, an experimental controlling strategy is suggested to reduce the leakage flow rate. To this end, a fan with hollow blades and a specific drive system were designed and built for air injection. Air is injected in the leakage gap at the fan periphery. The experiment was performed for three rotation speeds, five injection rates and two configurations: 16 and 32 injection holes on the fan's circumference. The experimental results of this investigation are presented in this articl

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of an actively controlled automotive cooling fan using steady air injection in the leakage gap

Azzam

Paridaens

Ravelet

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…In the current labyrinth piston compressor, the radial clearance between crosshead and slide-way is about 0.05-0.12 mm, and that between the guide bearing and the piston rod is usually chosen in the range of 0.03-0.06 mm. [5][6][7] However, these clearances could cause the piston rod to oscillate. Therefore, this guiding mechanism cannot ensure the piston to maintain a precise centering with the cylinder when the compressor is in operation.…”

Section: Introductionmentioning

confidence: 99%

Research on the piston precise electromagnetic centering of labyrinth-piston compressor

Cheng

Zhang

Liu

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part A:

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In labyrinth piston compressor, the precise centering of the piston is the most important prerequisite to realize the labyrinth seal and ensure the compressor running safety. However, the piston suffers very large periodically varying loads caused by the gas force and the inertia force, which lead to the eccentrically running of the piston in cylinder. Under this condition, the leakage of the labyrinth piston compressor will be intensified, and the risk of the friction between piston and cylinder wall will increase. In order to realize the piston precise centering, in this paper, an electromagnetic centering system is introduced including the principle, structure, and application. In order to realize the piston precise electromagnetic centering outside of the cylinder, the through-piston rod is adopted. And the guide bearing can be removed. Thus, the current cantilever structure for the piston centering will be replaced with the simply supporting structure. More importantly, this technology can also be used for the traditional large reciprocating compressor, and thereby, the piston rings, packing and other wearing parts can be removed as well.

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“…Besides above mentioned geometric conditions, boundary conditions, etc., the actual operation conditions also influence the static and dynamic characteristics of labyrinth seals. Rhode [17] presented some of the first measurements and visualization movies for stepped labyrinths to give an enhanced understanding of the effect of rounded labyrinth teeth tips and worn abradable lands. Kwanka [18] presented experimental and theoretical investigations concerning a long staggered labyrinth gas seal.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang¹,

Zhang²,

Yang³

et al. 2016

J. vibroeng.

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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.

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Measurement and Visualization of Leakage Effects of Rounded Teeth Tips and Rub-Grooves on Stepped Labyrinths

Cited by 8 publications

References 5 publications

Experimental investigation of an actively controlled automotive cooling fan using steady air injection in the leakage gap

Experimental investigation of an actively controlled automotive cooling fan using steady air injection in the leakage gap

Research on the piston precise electromagnetic centering of labyrinth-piston compressor

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

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