Spectrum, enhancement of turbulent transition, and turbulence suppression (reverse transition and relaminarization) of the plume is stably stratified ambient

摘要

Spectrum of the plume in a stably stratified ambient was elucidated to have gradients -9/2 and -8.0 at laminar state, and -5/3 and -3.0 at turbulent state, in addition the frequency band of the turbulence was higher than that of the swaying motion. By employing the above results, flow regimes, i.e. laminar, transitional, and turbulent, at any location can be determined. By plotting flow regimes on visualization photos, retransitional and relaminar phenomena are specified.