Active flow control earns growing interest for manufacturers of large transport aircraft because of the constant need to improve these aircraft in terms of less fuel consumption, higher efficiency, steep approaches and departures and less weight. Flow control devices that are based on fluidic actuators, e.g. vortex generator jets (VGJs), have shown a promising potential to influence separating boundary layers and keep them attached (e.g. Godard & Stanislas (2006ac); Johari. & Rixon (2003); Johnston & Nishi (1990); Mc Manus et al. (1996); Ortmanns et al. (2008a); Pauley & Eaton (1988); Scholz et al. (2006)). For an efficient operation such devices need to be optimized regarding their ability to influence the flow. However, optimization turns out to be very challenging because of the vast parameter space and the lack of an adequate figure of merit. The proposed contribution will discuss the possibility to assess and optimize such devices by analyzing the velocity fields from stereoscopic PIV measurements. 德國LaVision PIV/PLIF粒子成像測速場儀