Abstract:

The gas-liquid interaction process of cross liquid jet in 〖WTBX〗Ma〖WTBZ〗=1.94 supersonic flow is investigated numerically by using the Euler-Lagrange method. It is found that the main spray properties including spray penetration, Sauter mean diameter（SMD） and axial velocities agree reasonably well with the experiment. Numerical results indicate that there are strong interactions between the airflow and liquid spray. Under the influence of spray, a bow shock wave forms ahead of the jet. Airflow passes through both shock and spray zone in turn, there are twice decreases of the velocity of airflow. The results reveal that the streamlines of supersonic flow can intersect with the trajectory of droplet of the jet. The direction of airflow deflects to the wall after it enter into spray zone in the center plane. Two groups of reversed vortex pair induced by the gas-liquid interaction are first discovered. This could help to understand the mixed process between two phases. The analysis of gas-liquid relative velocity shows that the most notable effect of airflow occurs when droplets begin to turn around after penetrating into free flow, and the gas-liquid interaction gradually weakens while flowing downstream.

Key words: Supersonic, Large eddy simulation, Droplet, Gas-liquid interaction, Mixing