Ultrasonically Absorptive Coatings for Hypersonic Laminar Flow Control
Abstract
This report summarizes results of theoretical, numerical and experimental studies related to ultrasonically absorptive coatings (UAC) for laminarization of hypersonic boundary layer flow. Laminar flow control (LFC) technologies reduce heat-transfer rates as well as the weight and complexity of thermal protection system (TPS). The effort has been focused on maturing of the UAC-LFC methodology. Key components of the effort include theoretical analysis, direct numerical simulation (DNS), wind-tunnel experiments, as well as fabrication of ceramic materials that integrate UAC and TPS functions. To aid in the design of UAC with regular microstructure to be tested the CUBRC LENS I tunnel, parametric studies of the UAC-LFC performance were conducted for Mach=7 and Mach=10 free-stream conditions. The UAC parameters providing significant (more than twice) increase of the laminar run were predicted. First steps have been made in mathematical (from first principles) modeling of acoustic processes in UAC-LFC random structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 2007
- Accession Number
- ADA478942
Entities
People
- Alexander Fedorov
- David Marshall
- Janet Davis
- Norm Malmuth
Organizations
- Teledyne Technologies