We evaluate two leading-edge-based dynamic stall-onset criteria (namely, the maximum magnitudes of the leading-edge suction parameter and the boundary enstrophy flux) for mixed and trailing-edge stall. These criteria have been shown to successfully predict the onset of leading-edge stall at Reynolds numbers of O ( 10 5 ) , where the leading-edge suction drops abruptly. However, for mixed/trailing-edge stall, leading-edge suction tends to persist even when there is significant trailing-edge reversed flow and stall is underway, necessitating further investigation into the effectiveness of these criteria. Using wall-resolved large-eddy simulations and the unsteady Reynolds-averaged Navier–Stokes method, we simulate one leading-edge stall and three mixed/trailing-edge stall cases at Reynolds numbers of 2 × 10 5 and 3 × 10 6 . We contrast the progression of flow features such as trailing-edge separation and vortex formation across different stall types and evaluate the stall-onset criteria relative to critical points in the flow. We find that the criteria nearly coincide with the instance of leading-edge suction collapse and are reached in advance of dynamic stall vortex formation and lift stall for all four cases. We conclude that the two criteria effectively signal dynamic stall onset in cases where the dynamic stall vortex plays a prominent role.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Evaluating Dynamic Stall-Onset Criteria for Mixed and Trailing-Edge Stall


    Contributors:

    Published in:

    AIAA Journal ; 61 , 3 ; 1181-1196


    Publication date :

    2022-12-29


    Size :

    16 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Evaluating Dynamic Stall Onset Criteria for Mixed and Trailing-Edge Stall

    Sudharsan, Sarasija / Narsipur, Shreyas / Sharma, Anupam | AIAA | 2022


    Trailing-edge separation/stall alleviation

    WERLE, M. J. / PATERSON, R. W. / PRESZ, W. M. | AIAA | 1987


    Trailing-edge flap flow control for dynamic stall

    Green, R B | Online Contents | 2011


    Trailing Edge Flap Flow Control for Dynamic Stall

    Gillies, E.A. / Green, R.B. / Wang, Y. et al. | British Library Conference Proceedings | 2010


    Dynamic stall flow control via a trailing-edge flap

    Gerontakos, P. / Lee, T. | Tema Archive | 2006