Automization Data Requirements for Rocket Combustor Modeling,
ROCKWELL INTERNATIONAL CANOGA PARK CA ROCKETDYNE DIV
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The complex computer codes, which model liquid rocket combustors, require information about the distribution and atomization of these liquid reactants. The available informaiton is, in general, of questionable validity and applicability. Authors and users of combustion codes are often unaware of, or underestimate the importance of, these deficiencies in atomization data. This paper is intended to acquaint modelers with these deficiencies and their importance. It also presents results of analyses performed with a state-of-the-art rocket combustion code, demonstrating the important effects of such atomization information as initial droplet sizes and size distribution on vaporization rate and losses. Also, the questionable aspects and inapplicability of the available atomization data are discussed. One important and often neglected or misunderstood aspect of atmoization data is the differences between spatial concentration and flux often called temporal droplet size distributions. These are described, and a computer model constructed to assess the difference between concentration and flux droplet size distributions is described and results presented. Experimental data are also presented to demonstrate this difference. Finally, experimental results are presented taht demonstrate the very great, and often neglected effect, of the local gas velocity field on atomization.