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TECHNICAL PAPERS

Stiffness and Efficiency Optimization of a Hydrostatic Laser Surface Textured Gas Seal

[+] Author and Article Information
Y. Feldman, I. Etsion

Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, Technion City, Haifa 32000, Israel

Y. Kligerman1

Faculty of Mechanical Engineering, Technion—Israel Institute of Technology, Technion City, Haifa 32000, Israelmermdyk@tx.technion.ac.il

1

Corresponding author.

J. Tribol 129(2), 407-410 (Nov 18, 2006) (4 pages) doi:10.1115/1.2540120 History: Received August 04, 2006; Revised November 18, 2006

Microdimples generated by laser surface texturing (LST) can be used to enhance performance in hydrostatic gas-lubricated mechanical seals. This is achieved by applying microdimples with high area density over a certain portion of the sealing dam width adjacent to the high-pressure side, leaving the remaining portion untextured. The textured portion provides an equivalent larger gap that results in converging clearance in the direction of pressure drop and hence, hydrostatic pressure buildup, similar to that of a radial step seal. A mathematical model based on the solution of the Reynolds equation for compressible Newtonian fluid in a narrow gap between two nominally parallel stationary surfaces is developed. A detailed dimensionless analysis of the texturing parameters is performed to achieve maximum gas film stiffness with minimum gas leakage.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of a partial LST mechanical seal

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Figure 2

Schematic of an “equivalent step seal” (a); and its corresponding partial LST seal (b)

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Figure 3

Dimensionless stiffness, K, of the LST and radial step seals versus dimensionless depth ε or corresponding equivalent clearance ratio α, (P0=2, Sp=0.65)

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Figure 4

Design efficiency parameter of the LST or radial step seals versus dimensionless depth ε or corresponding equivalent clearance ratio α, (P0=2, Sp=0.65)

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Figure 5

Design efficiency parameter of the LST and radial step seals versus textured portion (or step location) γ, (P0=2, Sp=0.65)

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