Assessment of spray combustion models in large-eddy simulations of a polydispersed acetone spray flame
| Autor: | Thomas Jaravel, Qing Wang, Matthias Ihme |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Work (thermodynamics)
Field (physics) Mechanical Engineering General Chemical Engineering Evaporation Mechanics Combustion Physics::Fluid Dynamics Intrinsic low-dimensional manifold chemistry.chemical_compound Mixture fraction chemistry Acetone Physics::Chemical Physics Physical and Theoretical Chemistry Stokes number |
| Zdroj: | Proceedings of the Combustion Institute. 37:3335-3344 |
| ISSN: | 1540-7489 |
| DOI: | 10.1016/j.proci.2018.06.011 |
| Popis: | Spray combustion is of practical importance to various applications. To study spray flames, benchmark cases were investigated both experimentally and numerically. Previous numerical studies of these flames have identified sensitivities to gas-phase combustion models and the description of the droplet evaporation. The objective of this work is to examine effects of combustion models on the structure of an acetone spray flame. To this end, three different combustion models are examined, namely a finite-rate chemistry model, a flamelet/progress variable model, and a flame prolongation of intrinsic low dimensional manifold model. In the two flamelet approaches, effects of spray evaporation are considered in the limit of small Stokes number. By examining radial profiles and employing a doubly-conditioned analysis on gaseous mixture fraction and liquid-to-gas mass ratio, it is shown that both flamelet models show differences in the evaporation and subsequent gas phase combustion and temperature field. The use of a finite-rate combustion model in conjunction with a reduced chemical mechanism provide improved predictions of heat release and spray-flame structure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect