Mixing Measurements of Transverse and Oblique Sonic Jets in Supersonic Cross Flow

Abstract

The mixing of a sonic jet in a supersonic crossflow is examined using Schlieren and Planar Laser Mie Scattering (PLMS) imaging techniques to quantify jet penetration and mixing. The jets injection angle, the momentum ratio, and injection pressures are used to examine their effect on mixing. Each of the jet mixing configurations are examined in both the turbulent boundary layer where δBL/d=7.5 and the thin boundary layer with δBL/d~1. Varying the characteristics of injection techniques will also allow the examination of mixing and interfacial area growth between the sonic jet and the M=3.45 crossflow. A similarity coordinate transform is used to non-dimensionlize the trajectory and penetration of sonic jet injection as a function of momentum ratio and injection angle. For each momentum ratio, angles between +20 and –20 degrees collapse to a single profile, and also for each boundary layer all cases of different angles and momentum ratios collapse to a single profile. The thinner boundary layer cases showed improved collapse with regards to the similarity coordinate transform.