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An Experimental Investigation Into the Influence of Diameter-Blade Height Ratios on Secondary Flow Losses in Annular Cascades With Leaned Blades FREE

[+] Author Affiliations
Wang Zhong-Qi, Han Wan-Jin, Xu Wen-Yuan

Harbin Institute of Technology, Harbin, People’s Republic of China

Paper No. 87-GT-131, pp. V001T01A035; 7 pages
doi:10.1115/87-GT-131
From:
  • ASME 1987 International Gas Turbine Conference and Exhibition
  • Volume 1: Turbomachinery
  • Anaheim, California, USA, May 31–June 4, 1987
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7923-8
  • Copyright © 1987 by ASME

abstract

Three groups of the annular turbine cascades with diameter-blade height ratios d/1 = 1.9, 3, and 5 respectively are tested. Each group includes five types of cascades equipped with different kinds of leaned blades. For each type of the cascades, the distributions of total pressure, static pressure and exit flow angle along the pitch and the blade height are surveyed in detail. The experimental results show that the smaller the diameter-blade height ratio of the cascade, the more effective application of positively leaned blade to reduce the secondary flow loss, when the inner and outer walls of the cascade are cylindrical. Under this condition the effect of the blade leaning on the energy loss distribution along the blade height is notable. There is an optimal lean angle corresponding to the minimum of the overall energy loss in each cascade with leaned blades. The function-relation between the optimal lean angle and the diameter-blade height ratio is monotonic.

Copyright © 1987 by ASME
This article is only available in the PDF format.

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