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Numerical study on flow characteristics at blade passage and tip clearance in a linear cascade of high performance turbine blade

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Abstract

A numerical analysis has been conducted in order to simulate the characteristics of complex flow through linear cascades of high performance turbine blade with/without tip clearance by using a pressure-correction based, generalized 3D incompressible Navier-Stokes CFD code. The development and generation of horseshoe vortex, passage vortex, leakage vortex, tip vortex within tip clearance, etc. are clearly identified through the present simulation which uses the RNG k-ε turbulent model with wall function method and a second-order linear upwind scheme for convective terms. The present simulation results are consistent with the generally known tendency that occurs in the blade passage and tip clearance. A 3D model for secondary and leakage flows through turbine cascades with/without tip clearance is also suggested from the present simulation results, including the effects of tip clearance height.

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, Kookmin University, 136-702, Seoul, Korea

    Hyon Kook Myong

  2. Department of Mechanical Engineering, Graduate School, Kookmin University, 136-702, Seoul, Korea

    Seung Yong Yang

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  1. Hyon Kook Myong
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  2. Seung Yong Yang
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Correspondence to Hyon Kook Myong.

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Myong, H.K., Yang, S.Y. Numerical study on flow characteristics at blade passage and tip clearance in a linear cascade of high performance turbine blade. KSME International Journal 17, 606–616 (2003). https://doi.org/10.1007/BF02984462

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  • DOI: https://doi.org/10.1007/BF02984462

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