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• Numerical study of turbine rim seals performance with different sealing structures

  T. Bai, Q. Yang, J. , Y. Shi, S. qiao

  Rev. int. métodos numér. cálc. diseño ing. (2022). Vol. 38, (3), 32

  
  

  Abstract

  The unsteady large-scale vortex near the turbine rim has an important influence on the sealing performance. Characteristics and performance of four sealing structures are researched in this paper. Three-dimensional unsteady numerical simulation was adopted to deeply reveal the characteristics of the rim sealing vortex and its influence mechanism on the rim sealing performance. The results show that the rim seal vortex structure induced by the interaction between ingested gas and sealing flow in the gap is the leading cause of unsteady flow in the rim. The vortex size is suppressed with the increasing seal flow rate or a Chute seal structure. However, the rim seal vortex exit in the cavity gap under a low seal flow rate can suppress the gas intrusion and improve the sealing efficiency of the turbine cavity even with a simple sealing structure. The Chute sealing structure achieves better performance among the four sealing structures studied in this paper. It can achieve complete sealing under a low sealing flow rate of 0.5% and has less impact on the aerodynamic performance of the mainstream even with high sealing flow rate. The research of this paper has guiding significance for further understanding the sealing mechanism and optimizing the design of the sealing structures. 

  Abstract
  The unsteady large-scale vortex near the turbine rim has an important influence on the sealing performance. Characteristics and performance of four sealing structures are [...]

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• The impact and sensitivity analysis of beam and stringer for stiffness center of composite wing structure

  S. QIAO*, R. Ma, J. Jiao, X. Ma, X. Liu

  Rev. int. métodos numér. cálc. diseño ing. (2021). Vol. 37, (3), 37

  
  

  Abstract

  '''Wing stiffness center should be determined firstly for structure detail design. The present study focused on the impact analysis of beam and stringer for wing cross-section stiffness center based on thin wall structure mechanics theory. In order to discuss the impact of beam and stringer on stiffness center, the sensitivity formulas for stiffness center of wing cross-section were derived and expressed in terms of the dimension and layout of beams and stringers. The results indicated that the structural layouts of beam and stringer were important influencing factors in stiffness detail design of full composite wing structure. The research results can provide an important reference for the stiffness design and aeroelastic design of the full composite wing. '''Key words: '''Composite wing, Stiffness center, Layout, Dimension, Sensitivity

  Abstract
  '''Wing stiffness center should be determined firstly for structure detail design. The present study focused on the impact analysis of beam and stringer for wing [...]

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