The Impact of the Inlet Flow Profile on the Unsteady Swirl Distortion Characteristics of an S-Duct Intake Using Stereo PIV Methods

Propulsion system integration is expected to play a major role in the future. Despite recent technology improvements convoluted diffusing ducts generate notable unsteadiness, which affects the engine performance and operability. In this investigation the Stereo Particle Image Velocimetry technique has been applied at the Aerodynamic Interface Plane of a high-offset S-duct to quantify the unsteady flow distortion caused by the ingestion of a non-uniform flow profile at different inlet locations.