From: null@void.com   
      
   "Jim Wilkins"  writes:   
      
   > ...   
   >   
      
   > My simple intuitive take: The intake transforms high air velocity into   
   > low velocity pressure (like a sail), which pushes outward against the   
   > walls, forward against the diffuser and rearward against the flame,   
   > which can resist the inlet pressure through inertia because it   
   > increases the mass (added fuel) and velocity (high temperature) of the   
   > exiting exhaust gas.   
   >   
   > The unbalanced pressure against engine metal in front but against only   
   > hot gas behind is thrust, like the recoil of a gun where the forward   
   > pressure acts only on the freely exiting bullet.   
   >   
   > Per Newton, F=MA.  F is from the combustion chamber pressure, MA from   
   > the expanding exhaust.   
   >   
   > The recoil force of a garden hose nozzle is from a similar unbalanced   
   > pressure and acceleration. The recoil is much less without the nozzle   
   > though the volume flow rate may be greater.   
   >   
   > A nuclear reactor creates exhaust pressure by increasing only the   
   > temperature to accelerate the air, similar to the added thrust from   
   > the Mustang or Spitfire radiator. Hydrocarbon fuel also increases the   
   > mass and its hydrogen doubles the oxygen to water vapor volume. C + O2   
   > -> CO2, 4H + O2 -> 2 H2O.   
   >   
   > Complex:   
   > https://www.seitzman.gatech.edu/classes/ae4451/ramjets.pdf   
      
   PS - thanks for pointing-out thinking about a ramjet in terms of the   
   Bernoulli energy conservation in fluid flow equation.  Yup - Bernoulli   
   equation is a "familiar friend" having used it in foundry work.   
      
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