Lift generation Parafoil
What is parafoil?
A leading edge opened aerofoil
is called as “Parafoil”. We know already that leading edge is facing into the
wind for aerofoil. Since it has been opened, it just admits the air to flow
inside the volume covered by the upper and lower surfaces.
How aerofoil creates
lift?
What is bernouli's
principle? How it suits to the aerofoil?
Aerofoil has its upper surface
curved, whereas bottom is moreover flat. Physically the curved portion
accelerates the flow and so the top side airflow is getting increase in
velocity. Lower surface is experiencing less velocity when comparing the upper
surface.
We know from Bernoulis law that
for a fluid flow, if fluid velocity increases then pressure drops. In the upper
we are feeling less pressure and in the bottom a high one.
Bernoulis principle:
Total energy of a steady flowing fluid system is constant.
Bernoulis principle:
Total energy of a steady flowing fluid system is constant.
ƩE= k
PE+KE=
k
mgh+0.5
mv2 =k
dividing
both sides by volume
ρgh+
0.5ρv2=k
High pressure pushes the object
to compensate the low pressure zone created above; because of it body feels an
upward force called as Lift.
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