can anyone explain how the flame holder device in the afterburner of a jet engine works? Originally, judging by its name, I thought that this is where the fuel was injected and hence it "holds the flame" there. A closer look revealed that this is actually not true, on y J-79 for example the fuel injection nozzles are in the space between the rear turbine and the flame holder. The ignition torch however is where the flame holder is. So how does it work, how and where does the flame holder "hold the flame"?
I would understand if the fuel was injected AFTER the flame holder and due to shock waves created by the flame holder there is a pressure differential and the flame will only travel to the exhaust nozzle (low pressure) and not to the turbine (high pressure near the flame holder). But with the fuel injected BEFORE the flame holder this doesn't really make sense to me...I would expect the fuel to burn in the area between turbine and flame holder.
It kinda creates a area in the can that is like a pressure shelter so the Air does not blow ot the flame. I hope that makes sense, Darren