How, if at all, does the pressure of the combusting fluid change within a combustion chamber from the injector to the choke? Is it monotonically decreasing in pressure as you go from the injector to the nozzle (which makes sense, given that the fluid is clearly flowing that way)?

Even if so, how uniform is the pressure within the chamber, provided it's properly baffled & there's no combustion instabilities to consider? Is it sufficiently uniform to consider that the fluid is at constant pressure during the entire combustion?

  • $\begingroup$ More than a few Master's Theses could be written on this general topic! $\endgroup$ Commented Feb 24, 2020 at 15:12

1 Answer 1


This paper CFD SIMULATION OF A LIQUID ROCKET PROPELLANT (LH2 /LOx) COMBUSTION CHAMBER claims that the chamber properties are essentially constant until the constriction starts towards the throat.

enter image description here

  • 2
    $\begingroup$ Nice to see the CFD simulation confirming my expectation of a constant pressure throughout the chamber. $\endgroup$
    – Uwe
    Commented Feb 23, 2020 at 20:52
  • $\begingroup$ 300 m/s injection velocity they say? $\endgroup$ Commented Feb 25, 2020 at 9:44

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.