Numerical investigations on leakage performance of the rotating labyrinth honeycomb seal

Jun Li, Shengru Kong, Xin Yan, Shinnosuke Obi, Zhengping Feng

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


Three-dimensional Reynolds-averaged Navier-Stokes (RANS) solutions from CFX were utilized to investigate the leakage flow characteristics in the labyrinth honeycomb seal of steam turbines. At first, the accuracy and reliability of the utilized RANS approach was demonstrated using the published experimental data of the honeycomb seal. It showed that the utilized numerical method has sufficient precision to predict the leakage performance in seals. Then a range of sealing clearances, cell diameters, cell depths, rotation speeds, and pressure ratios were investigated to determine how these factors affect the leakage flow rate of the labyrinth honeycomb seal. The computed leakage flow rate increased with increasing sealing clearance and pressure ratios. Furthermore, the results show that the studied labyrinth honeycomb seal has the optimum sealing performance in the case of honeycomb cell diameter equals labyrinth step width, and the ratio of the honeycomb cell depth to honeycomb cell diameter is 0.93 under the designed condition. The flow pattern of each case is also illustrated to describe the leakage flow characteristics in labyrinth honeycomb seals.

Original languageEnglish
Pages (from-to)62501-1-62501-11
JournalJournal of Engineering for Gas Turbines and Power
Issue number6
Publication statusPublished - 2010 Jun


  • Labyrinth honeycomb seal
  • Leakage flow
  • Numerical simulation

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Fuel Technology
  • Aerospace Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering


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