Abstract:

Understanding the combustion process of a single droplet is helpful to improve the design for internal combustion engine.The volume of fluid (VOF)formulation is applied to model the combustion process of an n-decane droplet in room and high temperature (300 K, 633 K, and 1000 K)convective air streams.The flow fields for both phases are obtained with the axisymmetrical model.The chemical reaction is modeled with the one-step finite-rate mechanism and the physical properties of gas mixture are species and temperature dependent except for surface tension.A mass transfer model applicable to the VOF calculations due to vaporization of the liquid phase is developed in consideration with the fluctuation of the liquid surface.The model is validated by checking the burning rate constants, which accord well with the experimental data in literature.The Stefan flow is also clearly captured by the calculations.The results verify the feasibility of the VOF CFD formulation as well as the mass transfer model due to vaporization.