We assume static pressure of a fluid coming out of a pipe or nozzle of gas turbine with high temperature and velocity is equal to atmospheric pressure, which confuses me for some point.
Does it mean that a fluid in atmosphere can not have more or less static pressure than atmospheric pressure?
There is stationary air in room. It has no kinetic energy, so no dynamic pressure. It has only static pressure which is equal to atmospheric pressure.
Now, we suddenly add kinetic energy to it by turning a big fan on.
Its previous condition:
Its current condition:
Is static pressure in condition 2 equal to Patm or less than Patm?
I think total pressure in condition 1 and 2 can't be equal to each other, since we add extra energy. So, static pressure in condition 2 should be still equal to Patm.
When this fluid comes to a rest by hitting the wall, its static pressure will be its total pressure and be more than Patm.
Do you agree?