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Streamline segment statistics of premixed flames with nonunity Lewis numbers
Nilanjan Chakraborty1, Lipo Wang2, Markus Klein3
1School of Mechanical and Systems Engineering, Newcastle University Claremont Road, Newcastle-Upon-Tyne NE1 7RU, UK.
The Lewis number significantly impacts turbulent premixed flames by altering flame-generated turbulence and fluid motion interactions. Streamline analysis effectively captures these changes across various Lewis numbers.
Area of Science:
- Fluid Dynamics
- Combustion Science
- Turbulence Research
Background:
- The interaction between flames and fluid motion is crucial for understanding turbulent combustion.
- Streamline segment analysis, previously used in nonreactive turbulence, offers a novel approach to studying these interactions.
Purpose of the Study:
- To investigate the influence of the global Lewis number (Le) on streamline segment statistics in premixed flames.
- To analyze how Le affects flame-generated turbulence and its correlation with fluid motion.
Main Methods:
- Utilizing a direct numerical simulation database of premixed flames with Le ranging from 0.34 to 1.2.
- Applying streamline segment analysis to quantify changes in flame-fluid interaction characteristics.
Main Results:
- The global Lewis number (Le) significantly influences streamline segment features like curve length and velocity differences.
- Decreasing Le strengthens dilatation rate, flame normal acceleration, and flame-generated turbulence.
- A probability density function (pdf) expression for streamline segment length, developed for nonreacting flows, qualitatively captures behavior in reacting flows.
Conclusions:
- The global Lewis number is a key parameter governing flame-fluid dynamics in turbulent premixed flames.
- Streamline segment analysis provides valuable insights into the topological behaviors influenced by Le.
- The study highlights the role of flame-generated turbulence and acceleration in response to varying Lewis numbers.
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