Open AccessInfluence of vibration excitation on the zone of laminar–turbulent transition on a plate
Author(s) -
Yu. N. Grigoryev,
И. В. Ершов
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1666/1/012015
Subject(s) - laminar flow , reynolds number , turbulence , boundary layer , mach number , supersonic speed , laminar turbulent transition , excitation , physics , choked flow , mechanics , atomic physics , quantum mechanics
Influence of thermal nonequilibrium on the laminar–turbulent transition is studied on the basis of the e N -method for two widespread flow regimes of a supersonic boundary layer at Mach number M = 4.5. The set of actual frequencies of spatial disturbances was determined from the neutral stability curves for temporal disturbances. The families of N -factor curves were calculated for selected frequencies. The transition Reynolds number was determined for a given transition factor N T = 8 from the envelopes of the families of N -factor curves. Calculations show that for the level of the vibrational excitation below the dissociation limit and for N T = 8 the transition zone shifts downstream by 12÷14 % compared to a perfect gas.