I’ve just stated that prior to ignition, the pressure in the thrust chamber is greater than zero. Once ignition occurs, the pressure and temperature rise so that the mass flow in equals the mass flow out (flow equlibrium). So, the only difference before and after ignition is the temperature and pressure in the chamber, and in both cases, the pressure is greater than zero.
Right. So, what is your problem? In a boundless, infinite absolute vacuum, you cannot have thrust because ignition can’t occur.
In a finite thrust vacuum chamber, you can get some ignition because the vacuum is not absolute ( and therefore it is not longer a vacuum, but just a container or chamber).
I was thinking about this overnight and there must be a mathmatical formula for this hypothetical phenonmena we are both trying to describe. I believe the problem is balancing out the pressure of a boundless infinte vacuum to whatever you are trying to have occur. Wondering if a nuke would even explode in a boundless, infinite absolute vacuum, or what would happen.
That’s a test I’d like to see.