Accession Number:

AD1104805

Title:

Direct Numerical Simulation of Hypersonic Transition Delay over Carbon/Carbon Ultrasonically Absorptive Coatings

Descriptive Note:

Technical Report,01 Jun 2016,31 May 2019

Corporate Author:

PURDUE UNIVERSITY WEST LAFAYETTE United States

Personal Author(s):

Report Date:

2019-11-15

Pagination or Media Count:

85.0

Abstract:

Dr. Wagners group at DLR has successfully pioneered the use of carbon-carbon CC ultrasonically absorptive coatings UAC to delay hypersonic transition on a slender cone Wagner et al., AIAA 2012-5865. CC 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 CC UACs with the novel time-domain impedance boundary condition TD-IBC formulation developed by Scalo et al., Phys. Fluids 2015. Dr. Scalos 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 CC UACs acoustic absorption measurements. Their acoustic response will therefore be accurately modeled without the need to resolve or over-simplify the porous structure.

Subject Categories:

  • Fluid Mechanics
  • Acoustics
  • Coatings, Colorants and Finishes

Distribution Statement:

APPROVED FOR PUBLIC RELEASE