Setup and validation of a pulsed jet for turbulent boundary layer active control

The convective heat transfer enhancement is a very crucial topic. It possesses lots of industrial applications such as cooling of internal combustion engines or cooling of electronics, which in turn have an economical and environmental impact. Most of the current experiments in this field aim at maximizing the heat exchanged by convection between a fluid and a wall, in a forced-convection regime. One solution is to employ active flow controls, in particular pulsed jets. Pulsed jets acting on a cross flow generate distinct vortical structures, which interact with the wall. By changing several input parameters of the jet, it is possible to improve the heat transferred by convection. Most of the control actions found up to now are validated at low Reynolds numbers. Therefore, it is important to find optimal solutions valid for high Reynolds number applications: the CICLoPE facility is the optimal structure for high Reynolds number experiments. In particular, the objective of this thesis is to implement the jet that will be inserted in a high-Reynolds wind tunnel and to control the jet’s input parameters such as pulsation frequency, duty cycle and output velocity. A complete characterization of the jet has been performed, based on hot-wire anemometry, in order to have a full comprehension of the outcoming flow.