Volume 27 Issue 1
Jan.  2012
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Article Navigation >  Journal of Aerospace Power  > 2012  >  27(1): 160-168
GAO Jie, ZHENG Qun, LI Yi-jin. Effect of labyrinth-honeycomb seal of shrouded rotor blades on the aerodynamic performance of the turbine stage[J]. Journal of Aerospace Power, 2012, 27(1): 160-168.
Citation: GAO Jie, ZHENG Qun, LI Yi-jin. Effect of labyrinth-honeycomb seal of shrouded rotor blades on the aerodynamic performance of the turbine stage[J]. Journal of Aerospace Power, 2012, 27(1): 160-168.
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Effect of labyrinth-honeycomb seal of shrouded rotor blades on the aerodynamic performance of the turbine stage

  • College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China

  • Received Date: 2011-01-20
  • Rev Recd Date: 2011-06-03
  • Publish Date: 2012-01-28
    Abstract
  • A commercial CFD(computational fluid dynamics) software was used to research the effect of rotor labyrinth-honeycomb seal leakage on the main flow in a 1.5-stage axial turbine.Effects of rotor seal leakages on the main flow,and mixing between leakage and main flows on the downstream stator with different tip clearances were analyzed;in addition,the effect of labyrinth seal with and without honeycomb facings on the aerodynamic performance of turbine stages was compared.The simulation results show that,mixing between leakage and main flows leads to velocity deflection in the mixing zone,and the suction side incidence of the re-entering leakage flow in the subsequent stator causes additional losses.The re-entering leakage flow in the subsequent stator which has a high radial velocity,alters the flow structure of the upper half channel,and causes extra secondary losses,besides,the losses are increasing with a growing tip clearance.The honeycomb acts to kill swirl velocity development for the rotating labyrinth-honeycomb seal due to the specific hexagon structure,which weakens the flow over the circumferential direction.Thus,it decreases the velocity gradients produced by the different velocity components of main and leakage flows,and the mixing of the leakage jet and main flow is greatly decreased.The honeycomb changes the flow pattern of labyrinth-honeycomb seal which leads to a reduction in leakage compared to the labyrinth seal.

     

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