Leakage Characteristics of Gas Screw Seals

Miyake, Kunihiro; Watanabe, Eiichi; Ariga, Ichiro

doi:10.4271/861836

Cited by 2 publications

(1 citation statement)

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“…There are major differences between the physical properties of gas and liquid, such as viscosity, density, and compress factor. Very little research is about gas spiral groove seal, with the exception of Miyake, 26 Childs, 27 and Hu. 23 Therefore, research on gas spiral groove seal is still lacking and the flow mechanism has not been figured out.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on leakage performance and flow mechanism of spiral groove seal for shrouded blade in axial turbine

Xiong

Zhu

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Flow field of shroud leakage flow for a single-stage axial turbine has been investigated in this article. The spiral groove seal (SGS) is adopted for shrouded rotor blade to reduce tip leakage and improve turbine aerodynamic performance. A series of three-dimensional (3D) computational fluid dynamics (CFD) simulations are performed to investigate leakage characteristics and flow mechanism of various configurations with different angle, depth, width, and grooves number of the SGS. The original staggered labyrinth seal (LS) is also calculated for comparison. The results illustrate that small spiral groove angle can create more axial flow resistance; meanwhile, it will increase grooves number existing in the axial direction. Groove depth and tooth width will influence the number, shape, and strength of vortex in the groove. The leakage mass flow can be reduced by 36% and isentropic efficiency of the turbine can be increased by 0.26% when spiral groove angle, depth, and width of the SGS are 1.5°, 1.8 mm, and 0.8 mm, respectively. Overall, the optimal SGS can influence vortex generation and enhance energy dissipation in shroud cavity to reduce the leakage and suppress mixing loss of leakage flow with the main flow to some extent. It can be attributed to the combination of throttling effect and pumping effect of the SGS that realize leakage reduction and efficiency improvement. As a result, the SGS can effectively improve tip leakage flow of shrouded blade in axial turbine.

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Section: Introductionmentioning

confidence: 99%