Aerodynamics?

Question

What kind of Air pressure is it on top and underneath an Airplanes Wings. Is it dynamic pressure or air pressure. What is the Formula for it how do you measure it.

Answer 1

Dynamic pressure is simply a term used to imply the air is moving relative to the airplane.  Its opposite is called Static Pressure and is used to measure airspeed, Vertical speed, and altitude.

Both on top of and below the wings it will be referred to as dynamic pressure, however the air pressure on top of the wing is lower than the air pressure below it.

Answer 2

Pressure at any point will be the sum of static and dynamic pressures. You can use Bernoulli's principle to compute it, provided you have the required data. You will need to know the static pressure, free stream velocity and the density.

For streamlined and incompressible flow

v²/2 + gh + p/ρ = constant.

Where

v = fluid velocity at a point

g = acceleration due to gravity

h = height of the point above a reference plane

ρ= density of the fluid at all points in the fluid

p = pressure

Answer 3

The pressure at each location along the upper and lower surfaces of a wing is measured as the sum of the dynamic and static air pressures.  

These are measured values and if you wish to calculate them you'll need expensive software and plenty of experience.  The software is only reliable if you have data to compare.

The pressures are normally measured either by drilling holes on the surface or by placing thin tubes with holes in them on the surface.  The holes relay the pressure on the surface to calibrated transducers that interpret the pressure.