Control of flow separation over a circular cylinder using synthetic jet

Abstract The development of methods active separation flow control is great applied importance for many technical and engineering applications. Understanding the conditions from surface a bluff body essential design aircrafts, cars, hydro gas turbines, bridges buildings. Drag, acoustic noise, vibrations mixing depend drastically on parameters vortex process. We investigated possibility reducing longitudinal length reverse-flow region using method «synthetic jet» control. experiment was carried out compact straight-through wind channel with 1-m long test section cross-section 125x125 mm. jet placed at rear stagnation point circular cylinder. Reynolds number, based cylinder diameter free-stream velocity, 5000 von Kármán street shedding frequency without synthetic equal to 64.8 Hz. For first time, such set parameters, we high speed PIV demonstrate that injection into wake leads significant reduction in region.