Receptivity of hypersonic boundary layer to wall disturbances

摘要: Theoretical analysis of hypersonic boundary-layer receptivity to wall disturbances is conducted using a combination asymptotic and numerical methods. Excitation the second mode by distributed local forcing on flat-plate surface studied under adiabatic cooled conditions. Analysis addresses vibrations, periodic suction/blowing, temperature disturbances. A strong excitation occurs in regions where resonance with normal waves. It shown that function tends infinity as point branch discrete spectrum typical for boundary layers cool surfaces. Asymptotic resolves this singularity provides coefficient branch-point vicinity. Numerical results indicate extremely high vibrations suction/blowing vicinity located near lower neutral Mack mode.