Abstract
DOI: 10.2514/1.40360 A condensation phenomenon in free expansion plumes has been observed and studied in the past several decades. To model homogeneous condensation of small, polar molecules produced in the combustion products of chemical propellants, such as water, accurate microscopic cluster models need to be developed. In this work, the molecular dynamics method is used to develop a model of water cluster sizes, cluster–monomer collisions, and sticking probabilities necessary for the study of water homogeneous condensation in a plume expanding to low pressure, space conditions. The molecular dynamics results are integrated into a direct-simulation Monte Carlo simulation andthe simulated Rayleigh scatteringintensities arecompared with experimental datatotest the modelsanddirectsimulation Monte Carlo simulation results.
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