Propellant vaporization as a criterion for rocket engine design : calculations of chamber length to vaporize a single n-heptane drop

Richard J. Priem
naca-tn-3985
Jul 1957


Calculations based on droplet-evaporation theory show that for a given combustor length the percent of fuel mass vaporized can be increased by decreasing the fuel-drop size and the initial drop velocity, or by increasing chamber pressure, final gas velocity, and initial fuel temperature. The analytical results of this study were correlated to give a single curve of percent of fuel evaporated as a function of the chamber length and the factors involving these parameters. The calculated results agree with experimental results if the mass-mean-drop diameters for various injectors are assumed to be about 100 to 200 microns.

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