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Numerical and Experimental Analyses of Static and Dynamic Characteristics for Partially Helically-Grooved Liquid Annular Seals

[+] Author and Article Information
Keisuke Nagai

Graduate School of Nagaoka University of Technology, Department of Energy and Environment Science, Kamitomioka-machi 1603-1, Nagaoka-shi, Niigata 940-2188, Japan
s091057@stn.nagaokaut.ac.jp

Kazuki Koiso

Graduate School of Nagaoka University of Technology, Department of Mechanical Engineering, Kamitomioka-machi 1603-1, Nagaoka-shi, Niigata 940-2188, Japan
s143031@stn.nagaokaut.ac.jp

Satoru Kaneko

Nagaoka University of Technology, Department of Mechanical Engineering, Kamitomioka-machi 1603-1, Nagaoka-shi, Niigata 940-2188, Japan
kaneko@mech.nagaokaut.ac.jp

Hiroo Taura

Nagaoka University of Technology, Department of Mechanical Engineering, Kamitomioka-machi 1603-1, Nagaoka-shi, Niigata 940-2188, Japan
htaura@mech.nagaokaut.ac.jp

Yusuke Watanabe

EBARA Corporation, Japan, Honfujisawa 4-2-1, Fujisawa-shi, Kanagawa 251-8502, Japan
watanabe.yusuke@ebara.com

1Corresponding author.

ASME doi:10.1115/1.4040574 History: Received March 08, 2018; Revised June 12, 2018

Abstract

Numerical and experimental analyses of the static and dynamic characteristics of the liquid annular seals with axially partial helical grooves were conducted to investigate the effects of the axial length, gal, of the helically-grooved section in a seal stator. The numerical solution and experimental procedures were applied in the same manner as in our previous studies on through helically-grooved seals in which the grooves extended across the seal length. The equivalent numerical results qualitatively agreed with the experimental results, demonstrating the validity of the numerical analysis. The leakage flow rate, Q, for the partial seals was lower than that of a conventional through seal across a small range of rotor spinning velocities. In contrast, the reduction in Q due to the pumping effect caused by the spin of the rotor diminished with decreasing gal. For a small concentric whirling motion of the rotor, the radial dynamic reaction force, Fr, and the magnitude of variation in the tangential dynamic reaction force, Ft, with the whirling angular velocity increased with decreasing gal and their values approached the corresponding values for the smooth-surface seal. Under the same rotor whirling velocity, Ft for the partial seals became lower than that of the smooth-surface seal, although decreasing gal tended to increase Ft. These results suggest that the partial seals would improve the efficiency and stability margin of pumps due to a reduction in the leakage flow rate and suppression of the rotor forward whirling motion as compared to conventional through seals.

Copyright (c) 2018 by ASME
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