The Elastohydrodynamic Performance of Low-Friction, Zero-Leakage Metal Seals

1979 ◽  
Vol 21 (4) ◽  
pp. 275-285
Author(s):  
L. E. C. Ruskell
Keyword(s):  
Experimental Study ◽  
Fluid Flow ◽  
Hydraulic Actuator ◽  
Low Friction ◽  
Oil Film

Part 1 discusses the requirements for the satisfactory operation of a reciprocating metal rod seal for a hydraulic actuator. Elastohydrodynamic theory is used to predict seal performance, and results indicate that with a suitable geometry good lubrication is possible in both stroking directions of the jack rod, even when the fluid flow is against the sealed pressure. In Part 2, an experimental study of the lubrication of these seals is described. They exhibited low friction and zero net leakage, and measurements of oil film shape are presented which illustrate why this is so.

Low-friction fluid flow surface design using topology optimization

2020 ◽  
Vol 62 (6) ◽  
pp. 2915-2933
Author(s):  
Eduardo Tadashi Katsuno ◽  
João Lucas Dozzi Dantas ◽  
Emílio Carlos Nelli Silva
Keyword(s):  
Fluid Flow ◽  
Topology Optimization ◽  
Low Friction ◽  
Surface Design ◽  
Flow Surface

Experimental Study on Cavitation Boundary of Journal Bearing

2013 ◽  
Vol 378 ◽  
pp. 362-366
Author(s):  
Ying Yang ◽  
Li Xu ◽  
Wen Qing Liu
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Journal Bearing ◽  
Theory Model ◽  
Work Characteristics ◽  
Oil Film ◽  
Rotating Speed ◽  
Supply Pressure ◽  
Rupture Area ◽  
Experimental Rig

Under high and super-high speed conditions, oil film of the journal bearing is easy to crack and then becomes cavitation. The existence of cavitation has a great effect on the work characteristics of the bearing. Cavitation boundary of a three-groove journal beaing was investigated on the journal bearing experimental rig. The influences of rotating speed and supply pressure on cavitation boundary were studied. And experimental equations of reformation location and the percent of rupture area are established. The results show that rupture location of oil film is not related with rotating speed and supply pressure, otherwise reformation location of oil film is effected greatly by them. The experimental equations lay foundations for next research on cavitation theory model and stability.

Numerical and Experimental Study of Fluid Flow during Electrolytic Process for Magnesium Production

2012 ◽  
pp. 575-583
Author(s):  
Hyun-Na Bae ◽  
Myung-Duk Seo ◽  
Seon-Hyo Kim ◽  
Go-Gi Lee ◽  
Jae-Young Jung
Keyword(s):  
Experimental Study ◽  
Fluid Flow ◽  
Electrolytic Process ◽  
Magnesium Production

Study of Fault Self-Recovery and Seal Improvement for Centrifugal Compressor

2010 ◽  
Author(s):  
Weimin Wang ◽  
Jinji Gao ◽  
Yan Li ◽  
Shuangxi Li
Keyword(s):  
Experimental Study ◽  
Centrifugal Compressor ◽  
Thrust Bearing ◽  
Mechanical Performance ◽  
High Reliability ◽  
Relevant Information ◽  
Axial Displacement ◽  
Oil Film ◽  
Dry Gas Seal ◽  
Low Leakage

For centrifugal compressor, discharge or suction pressure variations due to process fluctuations or balance drum seal degradation can result in rotor thrust increasing which may jeopardize thrust bearing and compressor’s reliability. Also, the leakage flow through balance drum seal can seriously affect the efficiency of compressor. Summarizing the characteristic of axial displacement fault about centrifugal compressor and analyzing the mechanical performance of tilt pads thrust bearing, theory of axial displacement fault self-recovery is presented and realized through experimental study. The method presented in this paper monitors the stiffness of oil film and identifies the reason of axial displacement increasing. Also the low leakage feature of Dry-Gas-Seal (DGS), high reliability of labyrinth, and the feasibility of upgrading existing structure are taken into account at the same time to design a combined labyrinth-dry gas seal system on the balancing drum. Based on the combined seal system, a Fault Self-Recovering (FSR) mechanism for the fault of rotor axial displacement is introduced to assure the minimum oil film thickness was ensured in real time. The modern Computational Fluid Dynamics (CFD) and experimental study were used to validate this concept. The result and relevant information indicate that the method can realize axial displacement fault self-recovering effectively and the combined sealing system could improve the efficiency of the centrifugal compressor about four percent.

Experimental study on moving boundaries of fluid flow in porous media

2008 ◽  
Vol 53 (16) ◽  
pp. 2438-2445 ◽  
Author(s):  
HongWei Zhou ◽  
YaHeng Zhang ◽  
AiMin Li ◽  
DaYong Qiu
Keyword(s):  
Experimental Study ◽  
Porous Media ◽  
Fluid Flow ◽  
Moving Boundaries ◽  
Flow In Porous Media

An Experimental Study of Fluid Flow in Disk Cavities

1992 ◽  
Vol 114 (2) ◽  
pp. 454-461 ◽  
Author(s):  
S. H. Bhavnani ◽  
J. M. Khodadadi ◽  
J. S. Goodling ◽  
J. Waggott
Keyword(s):  
Experimental Study ◽  
Fluid Flow ◽  
Gas Turbine ◽  
Experimental Studies ◽  
Reynolds Numbers ◽  
Turbine Disk ◽  
Published Data ◽  
Disk System ◽  
Flow Rates ◽  
Pressure Distributions

Results are presented for an experimental study of fluid flow in models of gas turbine disk cavities. Experiments were performed on 70-cm-dia disks for rotational Reynolds numbers up to 2.29 × 106. Velocity and pressure distributions are presented and compared to previous theoretical and experimental studies for a free disk, and an unshrouded plane Rotor–Stator disk system. Minimum coolant flow rates for the prevention of ingress, determined for the case of a simple axial rim seal, compare well with previously published data.

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