Active control of an overexpanded jet using plasma-based actuators

Supersonic over-expanded jets, common during high-speed military aircraft takeoff, generate intense noise, posing health risks to personnel. This study tests a plasma actuator-based small perturbation control mechanism to reduce noise. Results show that optimal forcing conditions can achieve over 2.5dB noise reduction with minimal thrust loss. The study also explores the mechanisms behind noise reduction and examines the impact of control on jet flow features, providing insights into its effectiveness.