Abstract
Longitudinal vortices are produced by the interaction between jets and a freestream. The vortex generator jet method is an active control of flow separation and can achieve the adaptive control by properly adjusting the jet speed. The beneficial effect of separation control is obtained only if the jets are pitched to the lower wall and skewed with respect to the freestream direction. In the previous study, it was confirmed that the triangular orifice jets generate the strong vortices and make effective the pressure recovery in the diffuser for the three types of the jet orifice (circular, triangular, and square). In this study, four types of the jet orifice (model-U, model-D, model-L and model-R) are installed and the effect of the direction of the vertex of the triangular orifice on separation control is investigated. The effective suppression of flow separation was achieved for all models. Model-L (the vertex points to the direction of the jet pitch angle) is the most inferior model among the four models.
