Direct Numerical Simulation of Hypersonic Transition Delay over Carbon/Carbon Ultrasonically Absorptive Coatings
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 15, 2019
- Accession Number
- AD1104805
Entities
People
- Carlo Scalo
Organizations
- Purdue University