Numerical Simulation Of A Blowing Boundary-Layer Control System.

Abstract

The Instituto Tecnológico de Aeronáutica, ITA, in a joint with EMBRAER
and the Instituto de Aeronáutica e Espaço (IAE-CTA) has just finished the construction of a
low-speed open circuit wind tunnel. The new tunnel is inserted into a Project of
Technological Innovation supported by FAPESP (www. fapesp.br). The tunnel is now under
calibration. Just after its calibration the new wind tunnel will be furnished with a boundarylayer
control system. It will be a blowing system. This system usually has more than one air
jet blowing into the model region. Its main function is to keep the flow two-dimensional over
airfoil models. There are many variables involved in such a problem. There is need, for
example, to determine the position of the air jets in respect to the airfoil and their angle. In
order to access all the relevant parameters an initial two-dimensional numerical simulation is
under way. The numerical simulation of the flow, inside the wind tunnel, in the blowing
region will be performed using the commercial software FLUENT that has a history of great
success in several aeronautical applications at EMBRAER. As a result of such an effort it will
be possible to fine tune the design of the boundary-layer control system.