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Influence of Blade Profile on Secondary Flow in Ultra-Highly Loaded Turbine Cascades at Off-Design Incidence

[+] Author Affiliations
Hoshio Tsujita

Hosei University, Tokyo, Japan

Paper No. GT2013-95150, pp. V06AT36A028; 14 pages
doi:10.1115/GT2013-95150
From:
  • ASME Turbo Expo 2013: Turbine Technical Conference and Exposition
  • Volume 6A: Turbomachinery
  • San Antonio, Texas, USA, June 3–7, 2013
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5522-5
  • Copyright © 2013 by ASME

abstract

An increase of aerodynamic loading of turbine blade leads to the reductions of the numbers of blade and stage. As a result, the size and the weight of gas turbines could be reduced. However, the secondary flow becomes much stronger because of the steeper pressure gradient across the cascade passage, and consequently deteriorates the turbine efficiency. Therefore, it is very important to minimize the loss generation increased by the increase of loading. In the present study, the influences of blade profile on the secondary flow structure in a linear ultra-highly loaded turbine cascade (UHLTC) at off-design incidence were investigated in detail by using a numerical method.

The computations were performed for the flow in three types of UHLTC at zero and off-design incidences. The present three types of turbine blade are same in the inlet and the outlet metal angles but different in the length of the blade suction surface. The verification of the computed results was performed by comparing with the experimental oil flow visualizations and the measured static pressure on the blade surface. The decrease of the length of blade suction surface increased both the profile loss and the secondary loss according to the increase of incidence angle in the positive range. The positive incidence not only strengthened the horseshoe and the passage vortices but also induced a new vortex along the blade suction surface on the end-wall. The incidence angle at which the newly formed vortex appeared was influenced by the blade profile. Moreover, the newly formed vortex affected the strength of the pressure side leg of horseshoe vortex.

Copyright © 2013 by ASME

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