Active flow-control (AFC) is a fast growing multi-disciplinary science and technology aimed at altering a natural flow state or development path into a more desired state. The potential benefits of flow control may include improved performance, affordability, fuel consumption economy, and environmental compliance. A review of major techniques used in this context (with more emphasis on experimental methods) is presented along with a brief discussion on each of them.

Aircraft drag reduction is a great challenge but there is certainly room for improvements. The drag breakdown of a civil transport aircraft shows that the skin friction drag and the lift-induced drag constitute the two main sources of drag, approximately one half and one third of the total drag for a typical long range aircraft at cruise conditions. This is why specific research on this topics have been initiated and it seems that Hybrid Laminar Flow technology and innovative wing tip devices offer the greatest potential. The aim of this review manuscript is to highlight the state of the art...

Excited jets are an excellent platform for the study of fluid dynamics and turbulence as they display numerous phenomena that are encountered throughout the field of fluid dynamics. Many researchers have worked on jet flow control to enhance mixing and/or reduce noise. The impetus for the present study was to throw some light on various types of excited jets used so far in engineering applications.