Abstract
To control the heat transfer on the impingement surface, the oscillating rectangular jet, which flaps periodically in a direction normal to the nozzle axis, has been developed. The oscillating jet apparatus consists of the contraction section, the control ports having the PZT valves and the diffuser section. By opening and shutting the PZT valves, the jet was oscillated by the Coanda effect. In this study, the jet was oscillated in 1, 2 and 4Hz, and the distributions of the velocity and heat transfer coefficient were measured. The velocity profile was spread in wide spanwise direction, however, the maximum velocity decreases from the normal jet. The heat transfer coefficient was not changed with the jet frequency.
