Feasibility of Contact Elimination of a Mechanical Face Seal Through Clearance Adjustment

2000 ◽  
Vol 122 (3) ◽  
pp. 478-484 ◽  
Author(s):  
Min Zou ◽  
Joshua Dayan ◽  
Itzhak Green
Keyword(s):  
Pattern Recognition ◽  
Power Spectrum ◽  
Real Time ◽  
Parametric Study ◽  
Experimental Results ◽  
Face Seal ◽  
Angular Misalignment ◽  
Adjustment Mechanism ◽  
Mechanical Face Seal

The feasibility of eliminating contact in a noncontacting flexibly mounted rotor (FMR) mechanical face seal is studied. The approach for contact elimination is based on a parametric study using FMR seal dynamics. Through clearance adjustment it is possible to reduce the maximum normalized relative misalignment between seal faces and, therefore, eliminate seal face contact. Clearance is measured by proximity probes and varied through a pneumatic adjustment mechanism. Contact is determined phenomenologically from pattern recognition of probe signals and their power spectrum densities as well as angular misalignment orbit plots, all calculated and displayed in real-time. The contact elimination strategy is experimentally investigated for various values of stator misalignment and initial rotor misalignment. Contrary to intuition but compliant with the parametric study, the experimental results show that for the seal under consideration contact can be eliminated through clearance reduction. [S0742-4795(00)01503-9]

scholarly journals Feasibility of Contact Elimination of a Mechanical Face Seal Through Clearance Adjustment

1999 ◽  
Author(s):  
Min Zou ◽  
Joshua Dayan ◽  
Itzhak Green
Keyword(s):  
Pattern Recognition ◽  
Power Spectrum ◽  
Real Time ◽  
Parametric Study ◽  
Experimental Results ◽  
Face Seal ◽  
Angular Misalignment ◽  
Adjustment Mechanism ◽  
Mechanical Face Seal

The feasibility of eliminating contact in a noncontacting flexibly mounted rotor (FMR) mechanical face seal is studied. The approach for contact elimination is based on a parametric study using FMR seal dynamics. Through clearance adjustment it is possible to reduce the maximum normalized relative misalignment between seal faces and, therefore, eliminate seal face contact Clearance is measured by proximity probes and varied through a pneumatic adjustment mechanism. Contact is determined phenomenologically from pattern recognition of probe signals and their power spectrum densities as well as angular misalignment orbit plots, all calculated and displayed in real-time. The contact elimination strategy is experimentally investigated for various values of stator misalignment and initial rotor misalignment Contrary to intuition but compliant with the parametric study, the experimental results show that for the seal under consideration contact can be eliminated through clearance reduction.

Dynamic modeling of an eccentric face seal including coupled rotordynamics, face contact, and inertial maneuver loads

2017 ◽  
Vol 232 (6) ◽  
pp. 732-748
Author(s):  
Philip Varney ◽  
Itzhak Green
Keyword(s):  
Dynamic Modeling ◽  
Equations Of Motion ◽  
Center Of Mass ◽  
Contact Friction ◽  
Face Seal ◽  
Transient Operation ◽  
Angular Misalignment ◽  
The Face ◽  
Mechanical Face Seal ◽  
Constitutive Components

Mechanical face seals are constitutive components of turbomachines, which in turn can be constitutive to other systems (e.g. aircraft). Furthermore, the rotating element of a face seal is inextricably coupled to the turbomachine via a flexible mount, and the stationary seal element is coupled to the rotating seal element via the fluid film existing between the seal faces. Consequentially, understanding interactions between the seal and turbomachine is important for quantifying seal performance and improving its design. With few exceptions, previous works study the face seal dynamics independent from the rotordynamics. In addition, most prior investigations consider only angular and axial seal dynamics and neglect eccentric (i.e. lateral) deflections of the seal element(s). For the first time, this work develops a comprehensive and novel model of a mechanical face seal in the inertial reference frame including coupled rotordynamics and inertial maneuver loads of the overall system. The model is developed for a general seal geometry where both seal elements, stationary and rotating, are flexibly mounted and allowed to undergo angular, axial, and eccentric deflections. In addition, the seal model presented here accounts for transient operation, fluid shear forces, seal face contact, friction, and thermoelastic deformation. Finally, various faults due to manufacturing imperfections, component flaws, and/or installation errors can be accounted for by incorporating static angular misalignment of both seal elements, dynamic angular misalignment of the rotating seal element, eccentric rotating imbalance, and axial offset of the rotating seal element center of mass. Throughout this work, the equations of motion developed are valid for both steady-state and transient operation. This comprehensive model significantly advances the state of the art in mechanical face seal dynamic modeling and represents a pivotal step towards analyzing seal performance regarding a broad diversity of realistic problems.

A Zero-Leakage Film Riding Face Seal

1985 ◽  
Vol 107 (3) ◽  
pp. 326-330 ◽  
Author(s):  
A. Lipschitz
Keyword(s):  
Experimental Results ◽  
Face Seal ◽  
Mechanical Face Seal ◽  
Rotor Surface ◽  
Dynamic Seal

A new [1] zero-leakage film riding mechanical face seal is presented. The seal serves as a static-contacting seal while the machine shaft is in stand-still and turns into a film riding dynamic seal by lifting off the rotor surface to a few micro-meters gap once motion has begun. The dynamic sealing as well as lifting capabilities stem from inter-connected hydro-dynamic bearings which are circumferentially distributed around the annular stator face. Approximate calculations together with preliminary experimental results are shown and analyzed.

Thermohydrodynamic Analysis of Spiral Groove Mechanical Face Seal for Liquid Applications

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Yifan Qiu ◽  
M. M. Khonsari
Keyword(s):  
Temperature Distribution ◽  
Thermal Behavior ◽  
Parametric Study ◽  
Three Dimensional ◽  
Mechanical Seal ◽  
Face Seal ◽  
Cfd Model ◽  
Spiral Groove ◽  
Mechanical Face Seal ◽  
Overall Performance

In this study, a three-dimensional thermohydrodynamic (THD) CFD model is developed to study the characteristics of an inward pumping spiral groove mechanical seal pair using a commercial CFD software CFD-ACE + . The model is capable of predicting the temperature distribution and pressure distribution of the seal pair. Based on the CFD model, a parametric study is conducted to evaluate the performance of the seal. It is found that thermal behavior plays an important role in the overall performance of a seal. The spiral groove parameter can be optimized to achieve desired performance. The optimization is dependent on the application requirement of the seal.

Dynamic simulation and monitoring of a non-contacting flexibly mounted rotor mechanical face seal

2000 ◽  
Vol 214 (9) ◽  
pp. 1195-1206 ◽  
Author(s):  
M Zou ◽  
J Dayan ◽  
I Green
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Dynamic Simulation ◽  
Face Seal ◽  
Real Time Monitoring ◽  
Test Rig ◽  
Precession Angle ◽  
Angular Response ◽  
Potential Applications ◽  
Mechanical Face Seal

Mechanical face seal rotor dynamics is investigated through both simulation and real-time monitoring of a non-contacting flexibly mounted rotor (FMR) mechanical face seal in a seal test rig. Dynamic simulation is performed to investigate the seal rotor angular response to the stator misalignment, the stator angle, the initial rotor misalignment and clearance. Rotor angular response orbit is introduced and is able to characterize the rotor dynamic response. A real-time monitoring system is constructed in the test rig to monitor the instantaneous dynamic behaviour of the seal rotor, including its angularresponse, precession angle and angular response orbit. Experimental results agree qualitatively well with those of the dynamic simulation. Potential applications of the monitoring system for detecting seal face contact and for seal control are stated.

Parametric Study on a Wavy-Tilt-Dam Mechanical Face Seal in Reactor Coolant Pumps

2011 ◽  
Vol 54 (6) ◽  
pp. 878-886 ◽  
Author(s):  
Wei Liu ◽  
Ying Liu ◽  
Yuming Wang ◽  
Xudong Peng
Keyword(s):  
Parametric Study ◽  
Face Seal ◽  
Reactor Coolant ◽  
Mechanical Face Seal
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