A New Experimental Identification Method for Fluid-Induced Force in Labyrinth Seals

Dan Sun; Yan Ting Ai; Wan Fu Zhang; Jian Gang Yang

doi:10.4028/www.scientific.net/AMR.621.232

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 621A New Experimental Identification Method for...

A New Experimental Identification Method for Fluid-Induced Force in Labyrinth Seals

Abstract:

Seal force is an important factor in turbomachineries. The paper puts forward an expanded seal force identification model. A seal test rig with many sets of seals was set up. The distributed seal force in the cylinder was equivalent to the two selected planes by using double-plane unbalance force identification theory in rotordynamics. To consider the complex vibration of cylinder with the increasing rotating speed and inlet pressure, the cylinder was regarded as a vibration system with 4 degree of freedom. The 4×4 impedance matrix was tested with shaker at the two selected planes in two orthogonal directions. The equivalent seal force can be obtained via multiplying the impedance matrix by the measured cylinder vibration change. Influence of inlet pressure, rotating speed, eccentricity ratio, rotor vibration, and clearance was tested in the seal rig. Test results show that the seal force increases almost linearly with increasing inlet pressure, eccentricity ratio and vibration amplitude.

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Periodical:

Advanced Materials Research (Volume 621)

Pages:

232-236

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.621.232

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Online since:

December 2012

Authors:

Dan Sun, Yan Ting Ai, Wan Fu Zhang, Jian Gang Yang

Keywords:

Experimental Identification Method, Fluid-Induced Force, Seal

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References

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