Abstract
A fiber Bragg grating (FBG) system for evaluating real time variations of skin-friction drags introduced by several turbulence control actuators is tested in the wind tunnel with 1000×500×5000(mm)^3 test section. Two FBG sensors are for measuring the frictional drags and they are stringed between the fixed plate and floating plate. The other FBG sensor is for monitoring temperature and is mounted on a 500mm long floating flat plate. The plate is hanged by four stainless steel wires of 0.3mm diameter and set in the 3000mm in the downstream from the entrance. By using those sensors, skin-friction drage of the floating plate can be measured at the accuracy of less than 1mN. Several actuator arrays for turbulence control are placed in the upstream of the floating plate and variations of skin-friction drags are monitored by the FBG system.
