Overview
ABSTRACT
Seal rings may vibrate and oscillate. They dissipate friction heat. The first part of this article presents a nonlinear analysis and modeling of seal dynamic behavior for various layouts. A simplified linear model is then presented and its results are summarized. The second part develops the analysis and modeling of the thermal dissipation in the interface, the heat transfer by conduction in the rings and the exchange of heat by convection between the walls of the rings and the surrounding fluids. Two approaches are presented and compared through characteristic case studies of mechanical seals for water and for oil.
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Read the articleAUTHORS
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Noël BRUNETIERE: CNRS Research Fellow - Institut P', UPR CNRS 3346, Poitiers, France
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Bernard TOURNERIE: Professor Emeritus, University of Poitiers - Institut P', UPR CNRS 3346, Poitiers, France
INTRODUCTION
Articles
The desirable operation of a seal results from adjusting the distance between the friction faces, ensuring a compromise between low leakage and low friction. This involves controlling the relative displacements of the rings and the deformations of their friction faces.
That's why this article is devoted, first of all, to studying the dynamic behavior of packing rings, in order to assess the conditions for stable operation ensuring an interfacial film of optimum thickness. Indeed, in many fields of application, the dynamic behavior of liquid seals remains stable, making them easier to model.
Next, the paper discusses heat dissipation in the interface and heat transfer by conduction and convection with the environment via solid rings. A simplified approach leading to a semi-analytical solution is presented. It is validated by a more elaborate numerical model. This establishes the temperature rise of the friction faces and the temperature variations within the rings. The useful thermal length of the rings and the required cooling rate can then be deduced.
The importance of thermal aspects is also highlighted in the article
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KEYWORDS
dynamic and thermal behavior | modelisation | rotating seals
Mechanical seals
Dynamic behavior
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