Truck Aerodynamic Evolution
Since the early 90s, it has become more and more popular to treat
aerodynamic inefficiency at the front part of the truck by installing
wind deflectors, round corners, mirror deflectors and skirts.
Over the last few years, there has been considerable effort to treat the
aft part of trucks in order to reduce fuel consumption by using shape
simple add-on devices and steady state AFC methods;
but those have inherent
limitations and can lead to only half the
expected benefit of the new suggested method.
Those technologies include:
Compared to existing solutions, those from AFC Technologies promise breakthrough in both savings and functionality.
- Adjustable Inclination: Flat plates attached at the truck’s lee-side.
reduce drag, but are rather large, heavy and expensive.
Their size raises
functionality and compatibility issues
- Steady Blowing: Steady blowing was applied to a modified aft-region
of a truck
trailer and resulted in significant aerodynamic drag reduction
, but at a marginal
to zero -- or mostly negative energy efficiency
- Periodic Excitation: Some preliminary efforts have been made in this
that ultimately did not progress far
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