- published: 05 Aug 2014
- views: 15859
In incompressible fluid dynamics dynamic pressure (indicated with q, or Q, and sometimes called velocity pressure) is the quantity defined by:
where (using SI units):
Dynamic pressure is closely related to the kinetic energy of a fluid particle, since both quantities are proportional to the particle's mass (through the density, in the case of dynamic pressure) and square of the velocity. Dynamic pressure is in fact one of the terms of Bernoulli's equation, which is essentially an equation of energy conservation for a fluid in motion. The dynamic pressure is equal to the difference between the stagnation pressure and the static pressure.
Another important aspect of dynamic pressure is that, as dimensional analysis shows, the aerodynamic stress (i.e. stress within a structure subject to aerodynamic forces) experienced by an aircraft traveling at speed Failed to parse (Missing texvc executable; please see math/README to configure.): v
, i.e. proportional to Failed to parse (Missing texvc executable; please see math/README to configure.): q . Therefore, by looking at the variation of Failed to parse (Missing texvc executable; please see math/README to configure.): q