Application of synthetic jet arrays for flow separation control on a circular “hump” model

This research investigates the effectiveness of a spanwise array synthetic jet actuator (SJA) for control boundary layer separation over circular “hump” model. The influence geometrical and operational parameters – including position, velocity ratio (i.e., peak exit actuators to freestream cross flow, VR) actuation waveform on flow are investigated using hot-wire anemometry (HWA) particle image velocimetry (PIV) techniques. effect position SJA has been studied experimentally considerable length hump chord (from “apex” model near “trailing edge”) first time. investigation looks in more detail into mechanisms behind alleviation adverse pressure gradient as key factor controlling separation. VR performance SJAs shows importance momentum injection mitigation deficiency another important turbulent A holistic overview allowed reveal change patterns. results show that best from viewpoint occurs at 1.85 with reduction recirculation region around 42.6 44.2% by sine square waves excitation SJAs, respectively.