| 1. |
- Caraeni, D., et al.
(författare)
-
Modeling of liquid fuel injection, evaporation and mixing in a gas turbine burner using large eddy simulations
- 2000
-
Ingår i: Flow Turbulence and Combustion. - 1386-6184 .- 1573-1987. ; 65:2, s. 223-244
-
Tidskriftsartikel (refereegranskat)abstract
- The interaction of turbulence, temperature fluctuation, liquid fuel transport, mixing and evaporation is studied by using Large Eddy Simulations (LES). To assess the accuracy of the different components of the methods we consider first isothermal, single phase flow in a straight duct. The results using different numerical methods incorporating dynamic Sub-Grid-Scale (SGS) models are compared with DNS and experimental data. The effects of the interactions among turbulence, temperature fluctuation, spray transport, evaporation and mixing of the gaseous fuel are studied by using different assumptions on the temperature field. It has been found that there are strong non-linear interactions among temperature-fluctuation, evaporation and turbulent mixing which require additional modeling if not full LES is used. The developed models and methods have been applied to a gas turbine burner into which liquid fuel is injected. The dispersion of the droplets in the burner is described.
|
|
| 2. |
- Conway, S., et al.
(författare)
-
Large eddy simulation of the flow through the blades of a swirl generator
- 2000
-
Ingår i: International Journal of Heat and Fluid Flow. - 0142-727X .- 1879-2278. ; 21:5, s. 664-673
-
Tidskriftsartikel (refereegranskat)abstract
- Subsonic turbulent flow between the blades of a swirl generator is considered using large eddy simulations (LES). The boundary layer exhibits transition in the upstream parts of the blade. Further downstream, the Row separates both on the suction and the pressure surfaces. In the boundary layer, one may note the streaky vortices. In addition, due to the blade surface curvature large, time-dependent streamwise vortices are formed. The wake of the blades also contains large scale, time-dependent structures. These phenomena are captured directly by LES. In our study, we use two different subgrid scale (SGS) models: the first model is an implicit model and the second is a novel dynamic model dubbed the dynamic divergence model (DDM). The effects of the SGS model and the grid resolution are also investigated.
|
|
