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Aiming at the spiral sealing section part of spiral-labyrinth combination seal (SLCS), the influence of different shapes of spiral teeth on the sealing effect is investigated. Select three different spiral tooth shapes of SLCS (Rectangular-SLCS, Trapezoidal-SLCS, and Serrated-SLCS) to study the pressure drop and sealing effect of 1 to 6 spiral teeth in the SLCS sealing section under identical working conditions. Simulation results indicate that the Rectangular-SLCS(R-SLCS) with three spiral teeth has the best sealing effect: the pressure drop generated by the R-SLCS steam-side spiral sealing section is 10.61% higher than that of the Trapezoidal-SLCS(T-SLCS), 17.69% higher than that of the Serrated-SLCS(S-SLCS). The leakage amount of the R-SLCS steam-side sealing section is 9.05% less than that of the T-SLCS, 18.81% less than that of the S-SLCS. This verifies the feasibility of the new combined shaft seal design and provides a reference for the optimization design of turbine shaft end seals.

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Numerical Study of the Characteristics of Spiral Teeth of Steam Turbine Shaft End Combined Seal

  • 会议论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年

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  • Zhaojun Meng,
  • Keyu Wang,
  • Shuyu Meng,
  • Da Liu,
  • Shilong Liu,
  • Lei Zhang

摘要

Aiming at the spiral sealing section part of spiral-labyrinth combination seal (SLCS), the influence of different shapes of spiral teeth on the sealing effect is investigated. Select three different spiral tooth shapes of SLCS (Rectangular-SLCS, Trapezoidal-SLCS, and Serrated-SLCS) to study the pressure drop and sealing effect of 1 to 6 spiral teeth in the SLCS sealing section under identical working conditions. Simulation results indicate that the Rectangular-SLCS(R-SLCS) with three spiral teeth has the best sealing effect: the pressure drop generated by the R-SLCS steam-side spiral sealing section is 10.61% higher than that of the Trapezoidal-SLCS(T-SLCS), 17.69% higher than that of the Serrated-SLCS(S-SLCS). The leakage amount of the R-SLCS steam-side sealing section is 9.05% less than that of the T-SLCS, 18.81% less than that of the S-SLCS. This verifies the feasibility of the new combined shaft seal design and provides a reference for the optimization design of turbine shaft end seals.