Dr. Wagner's group at DLR has successfully pioneered the use of carbon-carbon (C/C) ultrasonically absorptive coatings (UAC) to delay hypersonic transition on a slender cone (Wagner et al., AIAA 2012-5865). C/C UACs are a very attractive passive hypersonic flow control technology due to their compatibility with practical thermal protection systems already found in hypersonic vehicles. Direct numerical simulations replicating the German experiments has been carried out by modeling the C/C UACs with the novel time-domain impedance boundary condition (TD-IBC) formulation developed by Scalo et al., Phys. Fluids (2015). Dr. Scalo's technique allows for the exact imposition in a Navier-Stokes solver of any physically admissible IBC. The required IBCs will be derived from a new campaign of C/C UACs acoustic absorption measurements. Their acoustic response will therefore be accurately modeled without the need to resolve or over-simplify the porous structure.


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    Metamaterials for Hypersonic Flow Control: Experimental Tests on Novel Ultrasonically Absorptive Coatings

    Pagliaroli, Tiziano / Patane, Fabrizio / Pagliaro, Andrea et al. | IEEE | 2018



    Hypersonic Boundary-layer Stabilization by Means of Ultrasonically Absorptive Carbon-Carbon Material Part 1: Experimental Results

    Wagner, A. / Hannemann, K. / Wartemann, V. et al. | British Library Conference Proceedings | 2013


    Hypersonic Boundary-layer Stabilization by Means of Ultrasonically Absorptive Carbon-Carbon Material - Part 2: Computational Analysis

    Wartemann, V. / Giese, T. / Eggers, T. et al. | British Library Conference Proceedings | 2013