Spray Combustion Modeling Including Detailed Chemistry
HEIDELBERG UNIV (GERMANY F R)
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SUMMARY AND CONCLUSIONS LOXH2 spray flames in the counter-flow configuration have been studied, and the gaseous oxygen profile shows a non-monotonic behavior because of the high reactivity of the system. The flames persist to strain rates up to 25,000s, and extinction has not yet been found. Multiple structures of laminar methanolair counter-flowing spray flames have been identified at low strain rates up to 400s on the spray side of the configuration for the present conditions. The gas-sided spray flame shows the same inner structure as a pure gas flamelet with appropriate boundary conditions, and this simplifies the implementation of the flamelet model for turbulent spray diffusion flames. The assumed beta-function for the turbulent mixing in spray flames is poor in regions where vaporization exists, and it has been replaced by a PDF transport equation for the mixture fraction. A modified beta-function is suitable to predict the shape of the PDF of the mixture fraction.
- Combustion and Ignition