Experimental study of the active control applied to the flow past a backward facing ramp

n experimental study of open loop active flow control on a backward facing ramp is presented. The ramp has finite span and a slant angle of 25 ^∘ . Wind tunnel experiments were performed both for the uncontrolled and the controlled cases where time periodic forcing by pulsed jets is considered. The control system exploits an electro-magnetic valve system to generate pulsed jets with an operating frequency and duty cycle ranging, respectively, between 50 and 250 Hz and between 25 and 60