Bengt E. G. Fallenius

Experimental determination of the aero-acoustic properties of an in-duct flexible plate

The potential reduction of the aeroacoustic noise generated by an in duct plate, byallowing it to be flexible, is studied experimentally. The test object is a triangular plateinserted at an angle i ...

Advanced Fluid Research On Drag reduction In Turbulence Experiments –AFRODITE–

A hot topic in todays debate on global warming is drag reduction in aeronautics. The most bene cial concept for drag reduction is to maintain the major portion of the airfoil laminar. Estimations ...

Miniature Vortex Generators for Flow Control in Falkner–Skan Boundary Layers

Vortex generators with heights comparable to displacement thickness are an effective means of producing persistent mean-flow streaks in laminar boundary layers. Inducing streaky base flows can supp ...

On the turbulent boundary layer with wall suction

An experimental analysis of the turbulent boundary layer subject to wall-normal suction is carried out on a 6.4 m long perforated plate by means of hot-wire anemometry. For this type of flow the scaling of the mean velocity and of the other statistical quantities remains an open question and the amount of experimental data available, especially regarding the fluctuating velocity components, is scarce. The longer streamwise length of the present experimental apparatus compared to the one used in the previous studies allows us to better investigate the development of the boundary layer: it is shown that a turbulent asymptotic state with a constant boundary-layer thickness, analogously to what happens for the laminar state, can be closely approached experimentally and that its mean velocity profile exhibit a clear logarithmic region.

Evaluation of Miniature Vortex Generators for Flow Control in Falkner-Skan Boundary Layers

Vortex generators with heights comparable to displacement thickness are an effective means of producing persistent mean-flow streaks in laminar boundary layers. Inducing streaky base flows can supp ...