Quote:
>> For example, if you leave out the converging section, then it takes a
much
>> higher chamber pressure to get supersonic flow in the diverging
section.
>> Bill
>If you leave out the converging section, it is impossible to
>achieve supersonic flow in the nozzle.
I think you're incorrect there -- there have been at least a couple
motors with supersonic exhaust, including both the US Rockets nozzleless
designs, and at least one medium-small commercial 4-chamber liquid motor
(this might have been used in the X-1 or X-1A) that had no convergent --
rather, they (apparently) depend on shock wave effects around the exit
to do the job that would be done by the convergent in a more
conventional motor.
If the burn rate and/or propellant flow rate is high enough, the
combustion can produce supersonic flow directly.
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