VISUALIZATION OF ENGINE EXIT FLOW ON STOL RESEARCH AIRCRAFT "ASKA" WITH INFRARED THERMAL CAMERA

Effects of Coanda Devices on Flow Attachment

Abstract

ASKA adopts an Upper Surface Blowing scheme as a powered lift system. This depends on Coanda effect of flow over curved wall surface. A typical vortex generator configuration has been introduced in flight tests and their supporting tests. Other interesting devices such as small vortex generators and side fences have also been developed. Recently all these Coanda devices have been examined, compared to the case of no device, in ASKA's ground tests. The report concerns indirect flow visualization by wall temperature measurements of main wings, flaps and a fuselage exposed to engine exit flow.