|Jun30-12, 03:13 AM||#1|
Wind force, drag, something :v
Heyy uh I have this problem I'm confused about; there is a body at rest (a sheet of cardboard set at an angle to electronic scales) and a fan blowing at the surface area. There is noticeable difference when I adjust the speed of the fan, the angle it sits at and the distance to the fan. Anyway I need help with the wind force equations, if I have the right equations.
These are the ones I have:
(Wind force) F= A* P* Cd [A: area of item, P: wind pressure, Cd: drag coefficient <- Huh??]
(Wind pressure) (1/2)*(density of air)*(wind speed)^2*(Shape factor)
Can somebody explain what the constants are and how to work them out, I would prefer if the responses are explanations not just links that are going to confuse me further
Any help will do :)
|Jun30-12, 06:07 PM||#2|
not my field but the equation I remember is the one here..
You can look up Cd for some standard shapes..
The best method of working out Cd for your set up is to run the equation backwards. eg measure the drag force at various known wind speeds and plot a graph.
|drag coefficient, help needed, urgent, wind force|
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