Heat Separation in Frictional Rotor-Seal Contact

[+] Author and Article Information
Björn Larsson

Dept. of Machine Diagnosis, Alstom Power Sweden, Finspång, Sweden

J. Tribol 125(3), 600-607 (Jun 19, 2003) (8 pages) doi:10.1115/1.1472456 History: Received February 29, 2000; Revised February 07, 2002; Online June 19, 2003
Copyright © 2003 by ASME
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Outer and inner seal holder in radial-axial view. Each seal cam is about 0.2 mm thick in the axial direction and the distance between them is 5 mm.
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Inner seal holder in radial-radial view. The whole seal consists of six parts, each 60 deg. The radial distances are not proportional, but seal cam and seal holder are enlarged for visibility.
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Coordinates in rotor seal system. The X-Y system refers to the seal, with γseal at the first ellipse major radius, and the x-y to the shaft, both non-rotating. The angle γshaft refers to stationary shaft position relative to the X-Y system. In the rotating shaft we have the r-ϕ system.
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Geometrical contact relations between shaft and seal disregarding contact forces. Stars indicate minimum gap, and will be the actual contact spots when contact forces are included. (a) Contact position with a centered forward whirl. (b) Contact position with a forward eccentric whirl. (c) Contact position with a forward whirl, in an elliptic seal.
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Seal dynamic model. The seal cams are represented by kseal.
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Force-deformation diagram. Both force and deformation refer to the radial direction.
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Nonlinear relation between vibration and heat generation. The smoothing relative to Fig. 6 is due to increasing contact times for higher levels of vibration.
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Geometries for approximation of heat conduction in shaft. The cylinder has infinite length, and convection on the surface.
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Temperature in the axial-peripheral plane at the shaft surface. Steady state with a source of 1 W.
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Temperature along the z-axis (peripheral position zero, and radial at the shaft surface) at steady state with a source of 1W. The solid line is the half-space solution and the stars are the cylinder solution. Left: h=200 W/m2K, right: h=400 W/m2K.
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Step response of mean temperature at contact area for shaft (thick line) and seal (sawtooth line, uniform around the periphery). They are different because a source of 100 W is assumed into each part.
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Heat conduction in seal
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Bow step response of a Q=1400 W source into the shaft
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Bode plot of bow response (full solution). The absolute error between the full solution and the approximation is dashed. It is seen that the interesting dynamic region is between about 10−4 and 10−1 s.




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