Numerical Analysis of the Flow Field through a Turbine Stage with Bucket Tip Clearance

A numerical technique for the computation of three-dimensional turbulent flows through a turbine stage with bucket tip clearance is presented. To calculate nozzle and bucket flow regions simultaneously, steady interaction is assumed to occur at the connecting boundaries. To analyze the exact flow-re...

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Bibliographic Details
Published inJSME International Journal Series B Fluids and Thermal Engineering Vol. 38; no. 4; pp. 593 - 599
Main Author Shikano, Yoshio
Format Journal Article
LanguageEnglish
Published Tokyo The Japan Society of Mechanical Engineers 15.11.1995
Japan Society of Mechanical Engineers
Japan Science and Technology Agency
Subjects
Applied fluid mechanics
Cascade
Compressible Flow
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Hydraulic and pneumatic machinery
Numerical Analysis
Physics
Three-Dimensional Flow
Turbomachinery
Turbulent Flow
Compressible fluid
Turbulent flow
Gas turbines
Aerofoil cascade
Three dimensional flow
Numerical simulation
Turbomachinery
Velocity distribution
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Summary:A numerical technique for the computation of three-dimensional turbulent flows through a turbine stage with bucket tip clearance is presented. To calculate nozzle and bucket flow regions simultaneously, steady interaction is assumed to occur at the connecting boundaries. To analyze the exact flow-region geometry of the bucket tip clearance, an H-type computational grid system, which is also used in the nozzle and bucket flow regions, is used in the tip clearance region. A finite volume method is used to obtain the spatially discretized governing equations, while the damping surface technique is employed for the time integration. In the present analysis, a two-equation model of turbulence is introduced to estimate the turbulence effect. In order to verify the validity of the present method, computations are carried out for the flow through turbine stages of different tip clearance heights. The results show clear simulation of secondary flow phenomena such as the tip leakage vortex and passage vortex motions in the bucket flow region. The effects of the clearance height on the turbine stage flow fields are also well predicted qualitatively.
ISSN:1340-8054
1347-5371
DOI:10.1299/jsmeb.38.593