TS-33 Application of an Improved k-ε Turbulence Model to Predict the Compressible Viscous Flow Behavior in Turbomachinery Cascades(Session B-3: Advanced Numerical Analysis of Cascade)
スポンサーリンク
概要
- 論文の詳細を見る
In the present work two-dimensional viscous flows through compressor and gas turbine blade cascades at transonic speed are analyzed by solving compressible N-S equations in the generalized co-ordinate system, so that sufficient number of grid points could be distributed in the boundary layer and wake regions. An efficient Implicit Approximate Factorization (IAF) finite difference scheme, originally developed by Beam-Warming, is used together with a higher order Total Variation Diminishing (TVD) scheme based on the MUSCL-type approach with the Roe's approximate Riemann solver for shock capturing. In order to predict the boundary layer turbulence characteristics, shock boundary layer interaction, transition from laminar to turbulent flow, etc. with sufficient accuracy, an improved low Reynolds number k-ε turbulence model developed by the authors is used. In this k-ε model, the low Reynolds number damping factors are defined as a function of turbulence Reynolds number which is only a rather general indicator of the degree of turbulence activity at any location in the flow rather than a specific function of the location itself. The emphasis in this paper is on the modeling of turbulence phenomena and the effect of grid topology on results of computations. Computations are carried out for different flow conditions of compressor and gas turbine blade cascades for which detailed and reliable information about shock location, shock losses, viscous losses, blade surface pressure distribution and overall performance are available. Comparison of computed results with the experimental data showed a very good agreement. The results demonstrated that the Navier-Stokes approach using the present k-ε turbulence model and higher order TVD scheme would lead to improved prediction of viscous flow phenomena in turbomachinery cascades.
- 社団法人日本ガスタービン学会の論文
- 1999-11-14
著者
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Iwasaki Hideo
Mechanical Systems Laboratory Toshiba Corporation
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ISHIZUKA Masaru
Research and Development Center, Toshiba Corp.
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BISWAS Debasish
Mechanical Systems Laboratory, Toshiba Corporation
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BISWAS Debasish
Research and Development Center, Toshiba Corporation
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IWASAKI Hideo
Research and Development Center, Toshiba Corporation
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Ishizuka Masaru
Research And Development Center Toshiba Corp.
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Biswas Debasish
Mechanical Systems Laboratory Toshiba Corporation
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Iwasaki H
Mechanical Systems Laboratory Toshiba Corporation
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Iwasaki H
Institute For Materials Research Tohoku University
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Iwasaki Hideo
Research And Development Center Toshiba Corporation
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