Abstract
The chapter describes two different passive flow control devices (air-jet vortex generators (AJVGs) and rod vortex generators (RVGs)) and their possibilities to induce streamwise vortices and to control and reduce flow separation. For each strategy, a validation of the numerical model is performed by direct comparison of numerical results and measurements of different flow conditions: subsonic (M = 0.3) and supersonic (M = 1.43). The present investigations have been carried out for two flow cases. Firstly, a basic study of the creation and development of the streamwise vortex in space was performed. It consisted in one single vortex generator enclosed in a flat wall nozzle. Secondly, an array of 16 vortex generators were placed on a curved wall nozzle with negative pressure gradient (trying to mimic similar flow conditions as for airfoils or helicopter rotor blades), and the influence on the flow separation was studied. Besides, the implementation of vortex generators on airfoils is investigated, and their impact on the aerodynamic performance is quantified.
Published Version
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