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Comparison of Two Unsteady Intermittency Models for Bypass Transition Prediction on a Turbine Blade Profile

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Abstract

The present paper evaluates two unsteady transition modelling approaches: the prescribed unsteady intermittency method PUIM, developed at Cambridge University and the dynamic unsteady intermittency method developed at Ghent University. The methods are validated against experimental data for the N3-60 steam turbine stator profile for steady and for unsteady inlet flow conditions. The characteristic features of the test case are moderately high Reynolds number and high inlet turbulence intensity, which causes bypass transition. The tested models rely both on the intermittency parameter and are unsteady approaches. In the prescribed method, the time-dependent intermittency distribution is obtained from integral relations. In the dynamic method, the intermittency distribution follows from time-dependent differential equations. For unsteady computations, self-similar wake profiles are prescribed at the inlet of the computational domain. Joint validation of the prescribed and the dynamic unsteady intermittency models against experimental data shows that both methods are able to reproduce the global features of the periodical evolution of the boundary layer under the influence of a periodically impinging wake. The overall quality of the dynamic method is better than that of the prescribed method.

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Authors and Affiliations

  1. Institute of Thermal Machinery, Czestochowa University of Technology, Al. Armii Krajowej 21, 42-200, Czestochowa, Poland

    Władysław Piotrowski, Slawomir Kubacki & Witold Elsner

  2. Department of Flow, Heat and Combustion Mechanics, Ghent University, Ghent, B-9000, Belgium

    Koen Lodefier, Slawomir Kubacki & Erik Dick

Authors
  1. Władysław Piotrowski
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  2. Koen Lodefier
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  3. Slawomir Kubacki
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  4. Witold Elsner
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  5. Erik Dick
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Correspondence to Erik Dick.

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Piotrowski, W., Lodefier, K., Kubacki, S. et al. Comparison of Two Unsteady Intermittency Models for Bypass Transition Prediction on a Turbine Blade Profile. Flow Turbulence Combust 81, 369–394 (2008). https://doi.org/10.1007/s10494-008-9136-4

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  • DOI: https://doi.org/10.1007/s10494-008-9136-4

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