of blowers to deliver high-speed air to positioned over the vehicle. The first of wind resistance that the trailing
the vehicle's surface.
blower does the job of "breaking" blower experiences. The trailing
Concentrated air columns work on the air, which reduces the amount blower, which is now unencumbered
common principles. For example,
to increase the rate that water exits
a garden hose, you concentrate
the water stream. Or to increase
the brightness of a flashlight,
you concentrate the light beam.
Concentrated air columns are
achieved by using round discharge
nozzles at the bottom of the dryer
outlet. These round nozzles are
more effective than square or rectangular nozzles because they do not
tend to break up air flow, enabling
the air's velocity to stay concentrated longer, meaning it meets the
vehicle's surface at a higher rate of
speed, which results in the increased
removal of any remaining water.
Air drafting is a technique that
is used by racecar drivers. It literally splits the air, meaning there is
less air turbulence through which
the vehicle needs to be driven. In a
dryer system, air drafting is created
through the use of multiple blowers that combine to lessen wind
resistance. A typical air-drafting
blower system may consist of four
7.5-horsepower stationary blowers
with two center blowers that are
www.npnweb.com n NPN Magazine
March 2013
15
