Studies on Effects of Periodic Wake Passing upon a Blade Leading Edge Separation Bubble: Experimental Investigation using a Simple Leading Edge Model

K. Funazaki, Kazutoyo Yamada, Y. Kato

Research output: Contribution to conferencePaper

Abstract

This paper describes experimental investigation on aerodynamic interaction between incoming periodic wakes and leading edge separation bubble on a compressor or turbine blade, using a scaled leading edge model. The studies aims at expanding the range of the test conditions from that of the previous study (Funazaki and Kato[15]) in order to deepen the knowledge on how and to what extent upstream wake passing suppresses the leading edge separation bubble. Special attention is paid to the transitional behaviors of the separated boundary layers, in particular, to the emergence of wake-induced turbulence spots. Hot-wire probe measurements are then executed under five different flow conditions. The test model has a simple structure consisting of a semi-circular leading edge and two flat-plates. Cylindrical bars of the wake generator generate the periodic wakes in front of the test model. Effects of Reynolds number, Strouhal number, direction of the bar movement and incidence of the test model against the incoming flow are examined in this paper. The measurements reveal that the wake moving over the separation bubble does not directly suppress the separation bubble. Instead, wake-induced turbulence spots and the subsequent calmed regions have dominant impacts on the separation bubble suppression for the all test cases. Distinct difference of the bubble suppressing effect by the wakes is also observed when the direction of the bar movement is altered.

Original languageEnglish
Pages761-769
Number of pages9
DOIs
Publication statusPublished - Dec 1 2003
Event2003 ASME Turbo Expo - Atlanta, GA, United States
Duration: Jun 16 2003Jun 19 2003

Other

Other2003 ASME Turbo Expo
CountryUnited States
CityAtlanta, GA
Period6/16/036/19/03

Fingerprint

Turbulence
Strouhal number
Turbomachine blades
Compressors
Aerodynamics
Boundary layers
Reynolds number
Turbines
Wire

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Funazaki, K., Yamada, K., & Kato, Y. (2003). Studies on Effects of Periodic Wake Passing upon a Blade Leading Edge Separation Bubble: Experimental Investigation using a Simple Leading Edge Model. 761-769. Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States. https://doi.org/10.1115/GT2003-38281

Studies on Effects of Periodic Wake Passing upon a Blade Leading Edge Separation Bubble : Experimental Investigation using a Simple Leading Edge Model. / Funazaki, K.; Yamada, Kazutoyo; Kato, Y.

2003. 761-769 Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States.

Research output: Contribution to conferencePaper

Funazaki, K, Yamada, K & Kato, Y 2003, 'Studies on Effects of Periodic Wake Passing upon a Blade Leading Edge Separation Bubble: Experimental Investigation using a Simple Leading Edge Model' Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States, 6/16/03 - 6/19/03, pp. 761-769. https://doi.org/10.1115/GT2003-38281
Funazaki, K. ; Yamada, Kazutoyo ; Kato, Y. / Studies on Effects of Periodic Wake Passing upon a Blade Leading Edge Separation Bubble : Experimental Investigation using a Simple Leading Edge Model. Paper presented at 2003 ASME Turbo Expo, Atlanta, GA, United States.9 p.
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