/sci/ - Science & Math

>>14977923
>>14977927
>>14977930
>>14977932
I was thinking about how ramjets work, specifically how it can be that the exhaust velocity from a ramjet powered plane always exceeds the plane speed (in other words in ramjets, as in all other air breathing jet engines, the exhaust is moving in the opposite direction of the plane in the ground reference frame) But if ramjets work by converting the kinetic energy of the air into pressure energy, then the highest velocity they can hope for when converting that pressure energy back into kinetic energy through a nozzle is the velocity the air had before it was compressed (Bernoullis principle:the sum of pressure energy and kinetic energy is constant), doesn't matter if it was heated since heating it doesn't change the pressure in the brayton cycle engines