Transition prediction in external flows via linear stability theory

摘要: Paper summarizes progress in relating linear stability theory to transition location. Linear computations for both flight and low-disturbance wind tunnels, at low high speeds, T-S, Gortler, cross-flow modes indicate that, the absence of Morkovin “bypasses,” background disturbance levels corresponds N-factors order 9 11 (in agreement with early two-dimensional speed flow research A. M. O. Smith van Ingen) provided that appropriate physics, such as curvature effects, are included. This work indicates a much wider range applicability e N method than previously conjectured. Therefore, if roughness waviness fields small, eN can evidently be utilized correlate location parameterize effects (1) Mach number, (2) pressure gradient, (3) wall temperature, (4) angle attack, (5) mass transfer, (6) sweep, (7) history, (8) geometry/curvature, (9) body rotation, (10) chemistry, (11) bluntness. The next stage relationship between will prove extraordinarily difficult, exquisite often immeasurable details environmental required. Transonic specific accentuated disturbances their influences upon also discussed.