| Summary: | 碩士 === 國立海洋大學 === 船舶機械工程學系 === 83 === In the present study, the film dynamics model is utilized to
simulate the motion of annular liquid films which include
swirling hollow-cone shape and non-swirling bell-like shape.
The surface wave instability theory is used to analyze the
variation of wave growth rates due to film velocity,
viscosity, and ambient pressure. The film dynamics model and
instability theory are combined to predict the film flow
structure and the primary atomization characteristics such as
film penetration (e.g. film breakupup length) and film
trajectory range (e.g. spray angle). In order to develop the
droplet breakup model for further coupling with gas flow model
in the combustor chamber, the gas flow fields, including
structure of gas flow, pressure and velocity profiles, are
also analyzed. The computational results in the present study
are validated against the available past experimental data
and the comparison demonstrates a good agreement with the
data. This shows that the models used in the present study
can provide a good basis for predicting fuel atomization
characteristics in the gas turbine combustor. At last,
recommendations for future study are also proposed.
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