Computational Study of Jet-Actuation Design for Supersonic Flow Control*

An active flow control technique of micro jet-array is applied to a Multi-Aperture Rectangular Single Expansion Ramp Nozzle. The nozzle configuration introduces a bypass stream to the primary stream with a splitter plate to separate the flows. This study investigates the effects on the high-speed jet flow of an active flow control strategy by introducing a micro jet-array blowing into the region where the two streams coalesce using both experiments and simulations. To aid the experimental effort in implementing the actuators, we perform simulations of the interaction between the micro jet-array and the cross-jet flow to characterize the actuation profile at the outlet of the micro-jet array. Multiple simulations are conducted at various nozzle pressure ratios. The simulated results will be compared with the pressure data collected from experiments through near-field pressure transducers at various locations on a deck plate. Meanwhile, time-resolved schlieren images are used to visualize the flow behavior over the deck plate. In this joint effort, the experimental measurement will validate the computational results, and the simulated result will provide additional information in the active flow control study investigated in the experiments.