If building a liquid propellant rocket engine, with bi propellants, how does the dimensions of my Combustion chamber, affect the efficiency ?
but also what is the best C* dimensions for an earth sea level engine ?
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Think of it in terms of providing enough residence time for the propellants to vaporize, mix, and burn to completion. Since most of the flow is axial, the length of the chamber contributes more directly than any other dimension to the amount of time the propellants have to burn. The second most important dimension is the throat diameter which will set your pressure, thus the density of your chamber gasses and therefore influence the speed at which the gasses traverse the length of your chamber.