Receptivity of Hypersonic Non-Gradient Boundary Layer to Wall Disturbances
Abstract
Theoretical analysis of hypersonic boundary-layer receptivity to wall disturbances is conducted using a combination of asymptotic and numerical methods. Excitation of the second-mode waves by distributed and local forcing on the flat plate surface is studied under adiabatic and cooled wall conditions. Analysis addresses receptivity to wall vibrations, periodic suction-blowing through a hole or slot, and temperature disturbances. A strong excitation occurs in local regions where forcing is in resonance with normal waves. It is revealed that the receptivity function tends to infinity as the resonance point tends to the branch point of discrete spectrum that is typical for the cooled wall case. Asymptotic analysis resolves this singularity and provides maximal receptivity levels in the branch-point vicinity. Analytical results are integrated into the computational module providing fast estimates of receptivity levels for different types and shapes of wall forcing. Numerical results indicate extremely high receptivity to vibrations and suction-blowing near the lower neutral branch. Critical amplitudes of local and distributed vibrations are estimated for bypass of the linear stability phase. The theoretical model can be used to predict initial amplitudes of unstable waves in active (ascending) flights accompanied by skin vibrations.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1999
- Accession Number
- ADA363739
Entities
People
- Alexander V. Fedorov
Organizations
- Moscow Institute of Physics and Technology