Dynamic pressure characteristics
(1) Only the air that makes the directional flow exhibits dynamic pressure;
(2) The dynamic pressure has directionality, and only applies pressure to a plane perpendicular or oblique to the direction of the wind flow. The plane in the vertical flow direction is subjected to the maximum dynamic pressure, and the plane in the parallel flow direction is subjected to zero dynamic pressure;
(3) In the same flow section, the dynamic pressure varies according to the wind speed at each point; the dynamic pressure has no absolute pressure and relative pressure, and is always greater than zero.