Effect of the Direction of Triangular Orifice on Separation Control for VGJs
Details
Flow separation causes large energy losses in a fluid machinery and stall on airfoils. 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. In the previous study, it was confirmed that the triangular orifice generates the strong vortex and makes effective the pressure recovery in the diffuser for the three types of the jet orifice (circular, triangular, and square). In this study, the effect of the direction of the vertex of the triangular orifice on separation control is investigated. It is concluded that the Model-U (the vertex sets in the upstream direction) makes effective separation control in comparison with the other models.
