Is there something that makes injectors unsuitable as oxidizer pumps? Seems to me that rockets would benefit significantly from a pump with no moving parts that runs off its own exhaust.

  • $\begingroup$ What's the max pressure an injector pump can deliver? I seem to remember them as low pressure. $\endgroup$
    – zeta-band
    Commented Feb 27, 2018 at 19:04
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    $\begingroup$ The first problem I see is that if the exhaust isn't completely combusted when it enters the injector, it's liable to ignite the incoming propellant at the mixing stage. This may be less of a problem for a fuel pump if the exhaust is already fuel-rich (typical in most rocket engines)? $\endgroup$ Commented Feb 27, 2018 at 19:11
  • $\begingroup$ That wouldn't be a problem for hybrid rockets though $\endgroup$ Commented Feb 27, 2018 at 19:16
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    $\begingroup$ re: hybrid rockets, solid propellant exhaust tends to contain a lot of particles, etc, and shooting this into a stream of oxidizer sounds exciting but not in a good way. $\endgroup$ Commented Feb 27, 2018 at 19:32
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    $\begingroup$ Hmmm...monopropellant oxidizer(N20/H2O2) + catalyst could generate clean motive fluid for it. $\endgroup$ Commented Feb 27, 2018 at 19:52


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