Fundamental Definitions Flashcards
Define total pressure
Static pressure + dynamic pressure = p + 1/2rhoV^2
Define static pressure
The pressure exerted by a fluid at rest. This is the only force on a static fluid because there will be no shearing stresses.
Define dynamic pressure
½rho V^2. It is the kinetic energy per unit volume of a fluid.
Define viscosity
It is the shear stresses which are caused by colliding particles exchanging momentum.
Describe viscosity and what causes it qualitatively.
Viscosity causes friction between fluid particles and boundary walls. It introduces a resistance to motion. Qualitatively, viscosity is the resistance to motion of a fluid.
This resistance to motion is what causes the no-slip condition.
Define total drag.
Pressure drag + frictional drag.
Define pressure drag.
Form drag + induced drag.
Define parasitic drag.
Frictional drag + form drag.
Define centre of pressure.
The point at which the resultant force due to the pressure distribution acts.
How does CoP vary with AoA?
As AoA increases, the CoP moves forward, and vice versa.
