Spherically-symmetric droplet combustion (performed under reduced gravity conditions) has historically served as an ideal configuration in which to obtain measurements of burning parameters to validate detailed combustion models. In many of the early droplet combustion studies, the effect of sooting was not considered due to the complexity involved in incorporating soot formation mechanisms and the belief that sooting for fuels such as heptane was not important (based on degree of sooting measured under normalgravity conditions).
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