MULTICOMPONENT SPRAY-TURBULENCE INTERACTION
Licentiate thesis, 2018
This work presents the computaional and modelling efforts for multicomponent fuel sprays whose behavior is studied in constant volume combustion vessel. Lagrangian-Eulerian framework is followed where the liquid fuel is modelled using Lagrangian approach and the gas phase is modelled using Eulerian approach. The focus of this work is on Lagrangian liquid phase modelling and it's interactions with the gas phase. The spray modelling is done using VSB2 stochastic blob and bubble (VSB2) model which is developed with the aim of minimising tuning parameters by treating spray and it's submodels as one entity. The VSB2 model also removes overshoot or undershoot in predicted quantities by using relaxation equations based on thermodynamic equilibrium. The methods for modelling secondary breakup, evaporation and momentum transfer of liquid droplets are outlined in this work. Specifically computational method for differential evaporation in multicomponent fuel sprays is discussed.
The VSB2 model is validated against experiments performed in constant volume combustion vessels for multicomponent fuel sprays. Differential evaporation was predicted corrrectly by the model within acceptable limits when compared to experiments on component gasoline-diesel fuel blend. Effects of non-ideal vapor liquid equilibrium on multicomponent fuel evaporation of ethanol and iso-octane blend was also studied, and the predictions showed reasonable agreement with experiment. Ethanol was observed to have a strong influence on iso-octane and deviation from ideal behavior was strong for higher ethanol percentage and in these cases ideal vapor liquid equilibrium was seen to predict incorrect results.
multicomponent fuel sprays
Stochastic Blob and Bubble (VSB2) spray model
direct injection engines
Vignesh Pandian Muthuramalingam
Chalmers, Mechanics and Maritime Sciences (M2), Combustion and Propulsion Systems
Development and validation of a multicomponent fuel spray model (VSB2 Model)
SAE Technical Papers,; Vol. 2017-October(2017)
Muthuramalingam, Vignesh Pandian and Karlsson, Anders, "Influence of considering non-ideal thermodynamics on droplet evaporation and spray formation (for gasoline direct injection engine conditions) using VSB2 spray model, 2018
Fluid Mechanics and Acoustics
M Room Delta-Gamma