The production of a jet engine thrust is usually explained by action and reaction principle. The jet engine creates a change in momentum of gas by taking a small gas of air and giving it a large increase in velocity. By Newtons third law, equal and opposite reaction produces thrust.
But isn't the true fundamental source of thrust of a jet engine is the net force produced by the pressure distributions exerted over the surface of the engine as the fundamental mechanism by which nature communicates a force to a solid surface are by means of the surface pressure distributions.
Well, I had to read your second paragraph twice.... Yes, there will be forces exerted on the surfaces of the engine it self. These forces themselves could be included in a calculation of net force or thrust created by Netwons third law.
Newtons third Law is most correct...
http://www.engineeringmotion.com/vid...t-engine-works
"But isn't the true fundamental source of thrust of a jet engine is the net force produced by the pressure distributions exerted over the surface of the engine as the fundamental mechanism by which nature communicates a force to a solid surface are by means of the surface pressure distributions. "
Yes, it is true that if you were so inclined to sum up all of the internal forces on the jet engine and the axial forces on the bearings you would get the same answer as using rocket theory. But who would do it?
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