Numerical analysis of dilute methanol spray flames in vitiated coflow using extended Flamelet Generated Manifold model
arXiv:2208.11554 · doi:10.1063/5.0098705
Abstract
The present work focuses on the large eddy simulation (LES) and the study of turbulent dilute methanol spray flames in vitiated coflow using the secondary oxidizer Flamelet Generated Model (FGM). The modified FGM model uses an additional secondary oxidizer parameter in addition to the three other parameters previously used for spray flames progress variable, mixture fraction, and enthalpy. The results for gas phase and droplet properties are validated against the dilute methanol spray flame database for varying fuel injection amounts. The droplet statistics and the lift-off flame heights are accurately captured for all the cases. A proper orthogonal decomposition (POD) of the scalar fluctuating hydroxyl radical (OH) field and velocity-temperature field capture the flame structures in the downstream region of ignition kernels. The detailed POD analysis reveals that the base frequency of the dominant OH field equals that of the dominant vortical structure of 67.3 Hz. The flame propagation happens around these dominant vortical structures because of the less-strained fluid mixing.
References in corpus (9)
- Numerical simulation of Delft-jet-in-hot-coflow (DJHC) flames using the Eddy Dissipation Concept model for turbulence-chemistry interaction
- Investigation of Mixing Characteristics in Strut Injectors using Modal Decomposition
- Numerical Investigation of Flow Structures Around a Cylindrical Afterbody Under Supersonic Condition
- Numerical study of flow physics in supersonic base-flow with mass bleed
- Stabilization of lifted hydrogen jet diffusion flame in a vitiated co-flow: effects of jet and coflow velocities, coflow temperature and mixing
- Investigation of flow structures in a turbulent separating flow using hybrid RANS-LES model
- Modal Decomposition of Turbulent Supersonic Cavity
- Flow Characteristics of Elastically Mounted Slit Cylinder at Sub-critical Reynolds Number
- Numerical Study of Trailing and Leading Vortex Dynamics in a Forced Jet with Coflow