Experimental and Theoretical Studies of Hypersonic Laminar Flow Control Using Ultrasonically Absorptive Coatings (UAC)

摘要

This report results from a contract tasking Institute of Theoretical and Applied Mechanics as follows: The project is focused on detail experimental and theoretical studies of hypersonic laminar flow control using ultrasonically absorptive coatings (UAC) of regular porosity. Parametrical calculations of boundary layer stability on porous and solid walls will be conducted and compared with the experimental data to be obtained using the artificial wave- packet method and hot-wire measurements. The experimental investigations will be performed in the blowdown wind tunnel T-326 in Hypersonic Flow Laboratory of ITAM SBRAS at Mach 6. Both natural and artificially excited disturbances will be investigated on solid and porous surfaces of a sharp cone model. Detailed experimental data on transition loci, characteristics of natural and artificially excited disturbances will be obtained. This will allow us to perform direct validation of theoretical modeling and verify the experimental data previously obtained. Resutts of this project will provide a launching pad for future efforts including breadboard validation of UAC concept for the laminar flow control on blunt bodies, rough surfaces etc.