Experimental studies on aerodynamic performance and unsteady flow behaviors of a single turbine stage with variable rotor-stator axial gap: Comparisons with time-accurate numerical simulation

Ken Ichi Funazaki, Kazutoyo Yamada, Mamora Kikuchi, Hideaki Sato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)

Abstract

This paper describes experimental results from detailed measurements of aerodynamic performance of a single stage in the turbine test rig of Iwate University, focusing on effects of the rotor-stator axial gap in the turbine stage. The measurements using a 5-hole Pitot tube provide time-averaged flow information such as stagnation pressure distributions and velocity vectors behind the stator as well as the rotor. Time-accurate three-dimensional flow analyses are also made in this study using an in-house N-S code. Realistic flow analyses are achieved in terms of blade-count ratio only by adding one stator vane, resulting in 3:4 blade-count ratio for the present simulation. Aerodynamic characteristics at the exits of the stator as well as the rotor for three axial gap cases are examined in detail through the experimental data and the numerical results. It follows that the increase in the axial gap gives rise to small increment in exit flow angle from the stator, seemingly affecting the flow structure near the hub as well as tip regions around the rotor blades. Furthermore, the turbine stage efficiency slightly decreases with the axial gap enlargement.

Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2007 - Power for Land, Sea, and Air
Pages703-711
Number of pages9
DOIs
Publication statusPublished - Sep 25 2007
Event2007 ASME Turbo Expo - Montreal, Que., Canada
Duration: May 14 2007May 17 2007

Publication series

NameProceedings of the ASME Turbo Expo
Volume6 PART A

Other

Other2007 ASME Turbo Expo
CountryCanada
CityMontreal, Que.
Period5/14/075/17/07

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Funazaki, K. I., Yamada, K., Kikuchi, M., & Sato, H. (2007). Experimental studies on aerodynamic performance and unsteady flow behaviors of a single turbine stage with variable rotor-stator axial gap: Comparisons with time-accurate numerical simulation. In Proceedings of the ASME Turbo Expo 2007 - Power for Land, Sea, and Air (pp. 703-711). (Proceedings of the ASME Turbo Expo; Vol. 6 PART A). https://doi.org/10.1115/GT2007-27670