抄録
A thin plate in a jet core region is driven at both ends by stepping motors, which enable control of the frequency and the amplitude of rotational oscillation about a mean position set at a zero angle of attack. The maximum attack angle is nominally 1.8 degrees for the plates at 15 Hz and 27 Hz and zero for the stationary plate. The stationary plate does not affect the jet flow characteristics in the fully developed region at all. The effects of excitation are salient and appear firstly as a periodic deflection of the jet near the nozzle exit, which is amplified downstream and gives notable effects on the development of the jet. The rate of increase in jet half width reaches more than 5 times the value for an unexcited jet at an excitation frequency of 27 Hz.
