Originally Posted by downwardspiral
I know lol, I'm not denying that the air is pressurized, it is at 14.6 psia, or 0 psig. The concept of ram air is based on velocities... There is no mention of velocity in the ideal gas law, only pressure (F/A), volume(LWH), temperature, mass and a constant. A jet engine's thrust comes from flow of expanding exhaust gases through nozzle ... not intake air
. A turbo/turbine creates pressure due to expanding exhaust gases.
A true ram jet has no turbines.
How does it get started?
Air must be moving through the chambers which are a venturi with fuel nozzles and a spark plug in the after chamber.
If the incoming air is not of a higher pressure than the ambient you don't get an engine providing thrust. You get a bomb.
A
ramjet, sometimes referred to as a
stovepipe jet, or an
athodyd, is a form of
jet engine using the
engine's forward motion to compress incoming air, without a rotary compressor. Ramjets cannot produce thrust at zero airspeed and thus cannot move an aircraft from a standstill.
AHEM!
roadster with a stick