16.885J/ESD. 35J-Sept 2003 Pressures For M0.3, pressure and velocity are related by bernoulli equation For M>0., pressure and velocity (or Mach number are related, but equation is more involved Further restricted to no losses due to friction P1+0.5pV12=p2+05pV2=p p called static pressure 0.5pV2 called dynamic pressure =q called stagnation pressure p+q somewhat like potential plus kinetic energy16.885J/ESD.35J - Sept 2003 Pressures 1 2 • For M < 0.3, pressure and velocity are related by Bernoulli equation – For M > 0.3, pressure and velocity (or Mach number) are related, but equation is more involved – Further restricted to no losses due to friction. • p1 + 0.5UV12 = p2 + 0.5UV22 = p0 – p called static pressure – 0.5UV2 called dynamic pressure = q – p0 called stagnation pressure – p + q somewhat like potential plus kinetic energy