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Before everyone responds that this has been asked before, I have read through every relevant post I could find here and believe my question has not been clearly covered.

I also understand that "Unfortunately there is no simple equation to calculate the chamber pressure." as stated here. I am not looking for a defining equation.

My question is:

Once a desired theoretical chamber pressure is determined for a liquid engine, how is the engine designed to reach that pressure? For example, chamber temperature can be determined and controlled based on the combustion temperature of your propellants, O/F ratio, etc. Is chamber pressure achieved purely by experimental design, or are there equations/models for determining rough values? (e.g. A company determines they want to design their engine to 2500 psia Pc. What design criteria are relevant to reaching the target value?)

The gap in previous explanations that I have found is that the mechanism by which chamber pressure builds up is not clearly explained. It is repeated that chamber pressure is generally an initial design parameter, but I am looking to understand how it actually physically develops.

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  • $\begingroup$ Welcome to Space SE! Someone has voted to close your question with the reason "Needs more focus: This question currently includes multiple questions in one. It should focus on one problem only" I think the quickest remedy would be to delete #2 here and change "My two questions are" to "My question is". You can ask as many questions as you like, but each question should strive to be answerable with a single answer (though it's not always possible). $\endgroup$
    – uhoh
    Jan 12 at 22:56
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    $\begingroup$ Updated question to combine two separate questions. They were both asking essentially the same thing from different perspectives. $\endgroup$ Jan 13 at 0:57
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    $\begingroup$ yeah, i'll submit another question if needed for more details $\endgroup$ Jan 13 at 2:59
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    $\begingroup$ Sutton goes through this in Example 9-1 of the revered 4th edition: given a required thrust, propellant, and Pc, design the engine. It's quite lengthy and refers back to other quite lengthy sections. He starts out "No general rule can be given for designing thrust chambers...." $\endgroup$ Jan 13 at 4:49
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    $\begingroup$ What chapter title is that? I have a different version (9) and can't find the corresponding example $\endgroup$ Jan 13 at 5:41

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