Visualization of engine exit flow on STOL research aircraft.

The Short Take Off and Landing research aircraft "ASUKA" adopts an Upper Surface Blowing scheme as a powered lift system. Thus, exit flows from four engines mounted above the main wing are expected to attach well to the surface of wing and its downstream flaps in order to produce additional lift force. The report concerns flow visualization results from single engine outdoor tests and ASUKA ground tests. Introduced FV techniques are wall temperature non-contacting measurements with an infrared camera and water injection into engine exit flow.