This paper examines the role which droplet combustion can play in the development of liquid surrogate fuels. The spherical droplet flame configuration is the canonical configuration of liquid fuel combustion with its one dimensional transport process and spherical soot cloud that surrounds the droplet during burning, thus making it a useful perspective from which to develop a surrogate fuel. The liquid fuel burning process includes a number of characteristic parameters which can serve as useful benchmarks against which to compare performance of a surrogate and real fuel. For sprays and droplets these include burning rate, droplet extinction diameter, droplet number density, mean droplet size and soot emissions. At the same time, not all performance metrics of a real fuel can be replicated by a surrogate. An example is given for the case of a highly sooting aviation fuel (JP8) mixed with an alcohol (hexanol). It is shown that on one hand the spherically symmetric droplet burning rate of the JP8+hexanol blend is almost the same as pure hexanol, thus suggesting hexanol as a surrogate for the mixture in terms of burning rate. On the other, sooting propensities are significantly different for hexanol and the mixture.

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