pressure coefficient

The pressure coefficient is a dimensionless number used in aerodynamics. Most often in the design and analysis of an airfoil. The relationship between the coefficient and the dimensional number is:

C_p={p-p_\infty \over \frac{1}{2}*\rho*V^2}

where

$p_\infty$ is the free stream pressure
$\rho$ is the fluid density (sea level air is 1.225kg/m^3)
Cp of zero corresponds to a the same as the free stream pressure

Pressure Distribution

An airfoil at a given angle of attack will have what is called a pressure distribution. This is simply the pressure at all points around an airfoil. Typically graphs of these distributions are drawn so that negative numbers are higher on the graph, as the upper surface of the airfoil will usually have a more negative Cp and will hence be the top line on the graph.

Cl and Cp Relationship

The coefficient of lift can be calculated from the coefficient of pressure distribution by integration, or calculating the area between the lines on the distribution.

C_p=\int_{LE}^{TE}C_{p_l}(x)-C_{p_u}(x)\,dx

When the lower surface Cp is higher(more negative) on the distribution it counts as a negative area as this will be producing down force rather than lift

<< Previous

Word Browser

Next >>

mami koyama
airway (automobile)
nozomu sasaki
shanti snyder
ajams
takeshi kusao
ajax (automobile)
list of u.s. cities with large chinese american populations
van's aircraft
soyuz tm 22
georges delerue

ajax (1906 automobile)
william nicholson (chemist)
midreshet sde boker
ajax (1913 automobile)
soyuz tm 23
ajax (1921 automobile)
paula ben gurion
ajax (1926 automobile)
electro stimulation
andover earth station
dutch uncle

soyuz tm 24
joseph spencer
ajs
soyuz tm 25
al (automobile)
alan (automobile)
pdca
aland (automobile)
soyuz tm 26
alba (1907 automobile)
alba (1913 automobile)

soyuz tm 29
no more shall we part
prout
albany (automobile)
albany runabout
albar
soyuz tm 30
albatros (automobile)
albatross (automobile)
let love in
therizinosaurus