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An Analysis of the Secondary Flow Around a Tandem Blade Under the Presence of a Tip Gap in a High-Speed Linear Compressor Cascade
Citation key 2020_konrath_asme
Author Konrath, L. and Peitsch, D. and Heinrich, A.
Pages GT2020-14175
Year 2020
ISBN 978-0-7918-8406-5
DOI 10.1115/GT2020-14175
Location Virtual Conference, Online
Journal ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition
Volume Volume 2A: Turbomachinery
Month 09
Note V02AT32A001,
Technische Universität Berlin:
L. Konrath, D. Peitsch, A. Heinrich
Editor ASME
Series Turbo Expo: Power for Land, Sea, and Air
Abstract Tandem blades have often been under investigation, experimentally as well as numerically, but most studies have been about tandem blade stators without tip gap. This work analyzes the influence of a tip gap on the flow field of a tandem blade for engine core compressors. Experiments have been conducted in a high-speed linear compressor cascade on a tandem and a reference geometry. The flow is analyzed using five-hole probe measurements in the wake of the blades and oil flow visualization to show the near surface stream lines. First, the results for design conditions (tandem and conventional blade) are compared to measurements on corresponding blades without tip gap. Similarities and differences in the flow topology due to the tip clearance are analyzed, showing that the introduction of the tip clearance has a similar influence on the loss and turning development for the tandem and the conventional blade. The tandem blade features two tip clearance vortices with a complex flow interaction and the possible formation of a third counter-rotating vortex between them. An incidence variation from 0° to 5° for both blades indicate at first a similar behavior. After a separation of the flow field into gap and non-gap half it becomes apparent that the tandem blade shows higher losses on the gap side, while featuring a close-to-constant behavior on the non-gap side. Further investigation of the flow on the gap side shows indicators of the front blade exhibiting tip clearance vortex break down, while the rear blade seems unaffected.
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