Within the past 10 years, significant improvements have been achieved in the laser manufacturing process. It is feasible now to design various small-scale surface features (such as dimples, riblets, grooves, etc.) in gas turbine applications with the current manufacturing readiness level of laser surface texturing techniques. In this paper, the potential of adding riblets on a turbine endwall has been investigated through combined computational fluid dynamics and experimental studies in a low-speed linear cascade environment. Detailed comparisons of the flow structures have been made for cases with and without riblets on the endwall. The numerical results show that endwall riblets can effectively reduce the strength of the pressure side leg of the horseshoe vortex, lower the cross-passage pressure gradient, and alleviate the lift up of the passage vortex. Oil film flow visualization and exit aerodynamic loss survey in experiments support the computational fluid dynamics observations: The passage vortex loss core moves closer to the endwall with the addition of riblets. The present study consistently demonstrates that the addition of riblets can be an effective approach to reduce the endwall secondary flow. Further research questions are raised for the applicability of the riblets concept in actual engine conditions and options for design optimization.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Application of Riblets on Turbine Blade Endwall Secondary Flow Control


    Beteiligte:
    Miao, X. (Autor:in) / Zhang, Q. (Autor:in) / Wang, L. (Autor:in) / Jiang, H. (Autor:in) / Qi, H. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.11.2015




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





    Study on Tip Clearance Flow of Turbine Blade-Endwall Secondary Flow Structure

    Mingxu, Q. / Zhenping, F. | British Library Online Contents | 2005


    Application of Riblets to Wind Turbine Blades

    Higashino, Takaya / Yanase, Naho / Kurashima, Takahiro et al. | AIAA | 2025