Experimental Identification for Seals Rotordynamic Coefficients Based on Double Plane Balance Method

Hao Cao; Jian Gang Yang; Wan Fu Zhang; Rui Guo

doi:10.4028/www.scientific.net/AMR.291-294.1965

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 291-294Experimental Identification for Seals Rotordynamic...

Experimental Identification for Seals Rotordynamic Coefficients Based on Double Plane Balance Method

Abstract:

This paper presents a new rotordynamic measurements conducted on a test rig for evaluation of multiple rings of labyrinth seals. Considering the tilting motion of cylinder occurs in experiments, the impedance matrix of cylinder system is obtained first. An equivalent seal force identification model is set up for multiple seals based on double plane balance theory of rotor dynamics. The resultant seal forces are calculated on two end planes of the cylinder, and resolved to multiple sections that seals located. A frequency domain identification method delivers the test seals stiffness and damping coefficients. Compressed air inlet tests were run from 1000 rpm-2200rpm, 0.1-0.6Mpa supply pressures were used. For each ΔP test condition, the static eccentricity ratio ε=e/Cr is range from zero to approximately 0.6. Results show that 8 rotordynamic coefficients increase almost linearly with inlet/outlet pressure ratio. Increasing eccentricity ratio weakens the stability of seal-rotor system obviously.

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Periodical:

Advanced Materials Research (Volumes 291-294)

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1965-1969

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https://doi.org/10.4028/www.scientific.net/AMR.291-294.1965

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July 2011

Authors:

Hao Cao, Jian Gang Yang, Wan Fu Zhang, Rui Guo

Keywords:

Rotordynamic Coefficients, Seal, Vibration

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