In this paper, the various state-of-the-art approaches of drag-reducing and energy-saving technologies based on the boundary layer control are reviewed, focusing on the polymer drag reduction additives, the micro-morphology, the super-hydrophobic surface, the micro air bubbles, the heating wall, the vibrant flexible wall and the composite drag reduction methods.
Although the MBT has a penalty for obtaining the microblowing air associated with it, some combinations of the MBT with suction boundary layer control methods are an attractive alternative for a real application.
Two important approaches to alleviation of control chattering in sliding mode control are the boundary layer control (BLC) and the dynamic sliding mode control (DSMC).
To validate the effects described in Section Boundary Layer Control, a wind tunnel test was conducted for the belt-driven wing and the non-driven wing, both of which had the same airfoil shape.
The secondary flow set up by rotation provides mass boundary layer control, while the membrane transmembrane pressure is provided by the hydrostatic pressure from the G-field.
The emphasis is placed on experimentation relating to hydrodynamic excitation, although acoustic methods as well as traditional boundary layer control, such as steady blowing and suction, are discussed in order to provide an appropriate historical context for recent developments.
In addition, the mechanisms of different drag reductions based on the boundary layer control and the potential applications in fluid engineering are discussed.
This is particularly the case at higher MB concentrations where larger C values indicate a greater degree of boundary layer control and deviation from the intraparticle diffusion model.
Porous tubes or channels have been under considerable attention because of their various applications in biomedical engineering, design of filters, transpiration cooling boundary layer control, and gaseous diffusion.
The XF-104 did not feature the Boundary Layer Control System of the production aircraft.
