Control of Penetration and Mixing of an Excited Supersonic Jet Into a Supersonic Cross Stream (Postprint)

摘要

Rayleigh/Mie scattering from flow field ice crystals was used to study mixing and penetration of a forced a supersonic jet in a supersonic Mach- 2 cross stream. Instantaneous images--using image planes along side-view and normal end-view to the flow axis--were used to study the dynamical structures in the jet whereas ensemble images provide information regarding the jet trajectory. Standard deviation images reveal information about the large-scale mixing/entrainment. Probability density functions were used to evaluate the mixing along the time-average jet interface. Forced cases indicate the presence of periodic formation of large-scale eddies in the jet/free stream interface. The eddies were bigger in size and more convoluted in the forced cases as compared to the baseline. These provided high penetration of the jet into the free stream. Forced cases also show higher region involved in small scale and/or bulk mixing in both the side- and end-views.