Roughness trips are widely applied in wind-tunnel testing to hasten the laminar–turbulent boundary-layer transition. It is well known that they influence the boundary-layer transition and its development. However, their influence on aeroacoustic quantities (in particular, on the airfoil trailing-edge noise) is not yet fully understood. This paper discusses the relationship between the trip height and the boundary-layer development and radiated trailing-edge noise. Wind-tunnel experiments were performed with zigzag strips and grit elements placed on the surface of a NACA 0012 airfoil. The roughness trip heights k ranged from 17 to 214% of the undisturbed boundary-layer thickness δ k at the trip location. The chord-based Reynolds number varied from 1.3 × 10 5 to 3.3 × 10 5 . This paper shows that trip heights within 50 to 105% of δ k have little influence on the near field and the trailing-edge noise. However, trips with k / δ k > 1.05 increase the spectra of velocity and pressure fluctuations in the low-frequency range up to 2.5 and 3 dB, respectively, resulting in an increase of the trailing-edge radiated noise up to 4 dB in a similar frequency range. In summary, this paper shows the importance of carefully defining the roughness trip used to trigger a laminar–turbulent transition in aeroacoustic and aerodynamic measurements.


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    Title :

    Influence of Roughness Trips on Near- and Far-Field Trailing-Edge Noise



    Published in:

    AIAA Journal ; 60 , 10 ; 5880-5889


    Publication date :

    2022-06-15


    Size :

    10 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





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