Open-Loop Control for Jet Mixing Enhancement Using Acoustic Excitation*

Controlling jet flows is crucial in aviation and industry for enhancing jet mixing and reducing noise, leading to improved performance and efficiency. At Universidad Carlos III de Madrid, we have designed a state-of-the-art jet facility within an anechoic chamber to explore new jet flow control strategies. This facility features two loudspeakers in the stagnation chamber, serving a dual purpose: exciting jet instabilities for control at the nozzle and directly manipulating jet properties. Additionally, six synthetic jets will be installed at the nozzle exit to act radially on the flow, providing greater control over jet dynamics.

We are presenting open-loop jet flow control results aimed at enhancing mixing. The dynamics are studied using snapshot planar and tomographic Particle Image Velocimetry (PIV), along with simultaneous measurements from point-wise probes, such as hot wires and microphones.

Preliminary results demonstrate the effectiveness of the loudspeakers in influencing jet mixing properties. We will also present preliminary outcomes from the synthetic jets and their effect on generated jet noise, showcasing our setup’s potential for advanced jet flow control.