二次元振動翼列の乱流解析

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  • Numerical Analysis of Two-Dimensional Turbulent Flows Through an Oscillating Cascade.
  • 2ジゲン シンドウ ヨクレツ ノ ランリュウ カイセキ

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A numerical technique for the computation of two-dimensional unsteady turbulent flows through an oscillating cascade is presented. To consider the interblade phase angle, a time phase shifted boundary condition is introduced on the periodic boundaries. A finite volume method is used to obtain the spatially discretized governing equations, while the second-order accurate Adams-Bashforth method 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 assure the effectiveness of the present method, computations are carried out for the flow through cascades of flat plate blades (inviscid flow analysis), lens-type blades and compressor blades. The present method gives unsteady periodic flow fields including the aerodynamic forces and moments acting on the blade clearly, and the negative damping force is obtained from the computational result of flat plate cascade flow.

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