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Partial answer because based on a simulation doesn't address the secondary question about changes with throttling The paper CFD SIMULATION OF A LIQUID ROCKET PROPELLANT (LH2 /LOx) COMBUSTION CHAMBER shows a "flame front" in the sense that majority of the combustion reactions take place in a relatively small area of the combustion chamber. (zero ...


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This doesn't have a simple answer. From a pure chemistry standpoint you can observe that one CH4 molecule will completely react with two O2 molecules. CH4 has a molecular weight of 16, O2 has a molecular weight of 32. Thus you need 4x as much O2 by weight. However, there are two other factors involved: You can actually end up with more thrust with a bit ...


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