- Stagnation point
The stagnation point is a point on the surface of a body submerged in a fluid flow where the fluid
velocity is zero. The Bernoulli equation shows that thestatic pressure is highest when the velocity is zero. The velocity is zero at stagnation points so the pressure around the submerged body is highest at the stagnation points. This pressure is called thestagnation pressure .The Bernoulli equation shows that the
stagnation pressure is equal to thedynamic pressure plus free-streamstatic pressure . We can use this information in the equation for findingpressure coefficient C_p::C_p={p-p_infty over q_infty}where::C_p is
pressure coefficient :p isstatic pressure at the point at which pressure coefficient is being evaluated:p_infty is pressure at points remote from the body (free-stream static pressure):q_infty isdynamic pressure at points remote from the bodyStagnation pressure minus static pressure is equal to dynamic pressure; therefore the pressure coefficient C_p at stagnation points is 1.
On a streamlined body fully immersed in a
potential flow , there are two stagnation points. On a body with a sharp point such as thetrailing edge of awing , theKutta condition specifies that a stagnation point is at that location. The streamline at a stagnation point is perpendicular to the surface of the body.
Wikimedia Foundation. 2010.