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Squealer Tip Leakage Flow Characteristics in Transonic Condition

[+] Author Affiliations
Wei Li, Hongmei Jiang, Qiang Zhang

University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai, China

Sang Woo Lee

Kumoh National Institute of Technology, Gyeongbuk, Korea

Paper No. GT2013-95283, pp. V06AT36A029; 10 pages
doi:10.1115/GT2013-95283
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

The Over-Tip-Leakage (OTL) flow characteristics for a typical squealer tip of high pressure turbine blade, which consists of subsonic and transonic flow, have been numerically investigated in the present study, in comparison with the corresponding flat tip results. For the squealer tip employed, flow choking behavior still exists above the tip surface, even though the Mach number is lower and the transonic region is smaller than that for the flat tip. Detailed flow structure analysis shows that most of the fluid entering the squealer cavity is from the frontal leading edge region. The fluid migrates along the cavity and is ejected at various locations near the suction side rim. These fluid forms a large subsonic flow zone under the supersonic flow passing over the tip gap which reduces the OTL flow flux. The squealer design works even in the presence of choked OTL flow. Comparisons between results from two different cavity depths with and without relative casing motion suggest that the over tip leakage flow flux has much dependence upon the cavity depth for subsonic region, but is less sensitive to the depth for transonic tip flow region. Such behavior has been confirmed with and without the existence of relative casing motion.

Copyright © 2013 by ASME
Topics: Leakage flows

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