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Abstract The dynamics of a spiral groove dry gas seal (DGS) are analyzed using extreme operating conditions based on the semi-analytical method developed by Miller and Green. The compressible form of the Reynolds equation is solved numerically with a finite element method for the DGS gas film model to determine the stiffness model for the gas film during the dynamic process by calculating the gas film response to a step jump in the film thickness. Then, the stiffness model is applied to the kinetic model of the seal ring in the frequency domain. The movement of the seal ring in the time domain is obtained by an inverse Laplace transform. The method is used to solve for the transient response of a DGS to both the axial and tilt initial disturbances. The influences of the geometric parameters are evaluated to find reasonable parameters for parametric design to improve dynamic performance of the DGS for turbine compressor spiral groove DGS designs.
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| Keywords
dry gas seal (DGS)
dynamic property
semi-analytical method
spiral groove
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Issue Date: 15 February 2014
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2014,
Vol. 54
),Chen XU,Weifeng HUANG
