Sweeping jet actuator as a fresh attempt has been applied in controlling flow separations and improving aerodynamic performances in a linear turbine cascade with tip clearance. In the present study, the oscillating jet process of sweeping jet actuator in the tip clearance was illustrated and a potential advantage from a system integration perspective was validated by an unsteady numerical study. The excitation frequencies and excitation modes were also investigated for achieving the further understanding of the mechanism of sweeping jet actuator for controlling flow separations. By using sweeping jet actuator, the flow separation near the upper endwall was delayed and the flow loss at the outlet of the cascade was reduced. For the optimal case, the time-averaged total pressure loss decreased by about 11.7% with the jet flow rate of only 0.35% of the inlet flow rate. In addition, it was found that there exists an optimum frequency to achieve the optimum controlling effects on the flow separations. Because of the blockage of tip leakage flow at the local gap by the high-momentum fluid from sweeping jet actuator, the controlling effects on the tip leakage vortex loss were better than that on the passage vortex loss. Through the use of four excitation modes in this study, the total pressure losses at the outlet were all reduced in different degrees. Under the present boundary conditions and working parameters, the unsteady controlling mode of sweeping jet actuator was found to perform much better than the other steady modes.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Effects of a sweeping jet actuator on aerodynamic performance in a linear turbine cascade with tip clearance


    Beteiligte:
    Chen, Shaowen (Autor:in) / Li, Weihang (Autor:in) / Meng, Qinghe (Autor:in) / Zhou, Zhihua (Autor:in) / Wang, Songtao (Autor:in)


    Erscheinungsdatum :

    2019-09-01


    Format / Umfang :

    14 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    INFLUENCE OF LARGE TIP CLEARANCE ON TURBINE CASCADE PERFORMANCE

    Jeong, E.H. / Kim, J.W. / Park, K.W. et al. | British Library Conference Proceedings | 2009


    Investigation of Nozzle Clearance Effects on a Radial Turbine: Aerodynamic Performance and Forced Response

    Morelli, Anthony / Zhao, Ben / Yang, Ce et al. | SAE Technical Papers | 2013


    Tip Clearance Flow Control in a Linear Turbine Cascade Using Plasma Actuation

    Van Ness, Daniel / Corke, Thomas / Morris, Scott | AIAA | 2009