Numerical study of multicomponent spray flame propagation
| Autor: | Quentin Cazeres, Bastien Rochette, Varun Shastry, Bénédicte Cuenot, Eleonore Riber |
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| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
020209 energy Mechanical Engineering General Chemical Engineering Flame structure Relative velocity Evaporation Eulerian path Laminar flow 02 engineering and technology Mechanics Flame speed medicine.disease 01 natural sciences Laminar spray flame Multicomponent evaporation Analytically reduced chemistry Preferential evaporation Flame structure 010305 fluids & plasmas symbols.namesake 0103 physical sciences 0202 electrical engineering electronic engineering information engineering symbols medicine Physical and Theoretical Chemistry Vapours |
| Zdroj: | Proceedings of the Combustion Institute |
| ISSN: | 1540-7489 |
| DOI: | 10.1016/j.proci.2020.07.090 |
| Popis: | A computational study of one dimensional multicomponent laminar Jet-A/air spray flames is presented. The objective is to understand the e ect of various spray parameters (diameter, droplet velocity, liquid loading) on the spray flame structure and propagation. Simulation of the Eulerian gas phase is coupled with a Lagrangian tracking of the dispersed liquid phase. Jet-A surrogate of n-dodecane, methyl-cyclohexane and xylene is considered. A discrete multicomponent model for spray vapourisation is used along with an analytically reduced chemistry for computing the gas phase reactions. Both overall lean and rich cases are examined and compared with existing literature for single component spray flames. The preferential evaporation e ect, unique to multicomponent fuels causes a variation of fuel vapour composition on both sides of the flamefront and this has a direct impact on the spray flame structure and propagation speed. In the rich cases, multiple flame structures exist due to the staged release of vapours across the reactive zone. Spray flame speed correlations proposed for single component fuels are extended to the multicomponent case, for both zero and high relative velocity between the liquid and the gas. The correlations are able to accurately predict the e ective equivalence ratio at which the flame burns and hence the laminar spray flame speeds of multicomponent fuels for all cases studied in this work. |
| Databáze: | OpenAIRE |
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