A Unified Modeling Approach for Simulating Thermodynamic Phase Transformations during Turbulent Mixing and Combustion of Diesel Primary-reference Fuel Mixtures under High-Pressure Conditions
Abstract
The objective of the proposed effort is to develop a unified mathematical formulation to seamlessly describe flows in all regimes of the thermodynamic phase space with the same conservation equations. Specifically the effort will consider evaporation processes of multi-component liquids under thermodynamic conditions similar to pre-ignition in the combustion chamber of a Diesel cycle engine. The objective will be achieved by a novel formulation of the thermodynamic phase space. The advantage of this formulation is that no information about the thermodynamic phase space regime is required during the computation to perform the simulations, unlike for existing models. The methodology is based on Diffuse Interface Models (DIM) which have the unique capability of capturing material surfaces at the continuum level, and capturing surfaces in the making that are identified by large density gradients; no assumption about the shape of the volume enclosed by the surfaces or surfaces-in-the-making is necessary. This DIM capability means that vorticity created at numerous surfaces or surfaces-in-the-making is taken into account. In the "proposed model, the information about the thermodynamic phase can be found a posteriori, from interrogation of the database. A novel methodology and model are proposed for finding the relevant thermodynamic regimes for multi-species mixtures. Direct Numerical Simulations are proposed for Diesel primary-reference fuels to demonstrate these models for turbulent mixing and combustion.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 12, 2017
- Source ID
- W911NF1610073
Entities
People
- Josette Bellan
Organizations
- Army Contracting Command
- California Institute of Technology
- United States Army