Title: Numerical simulation using real-fluid multiphase thermodynamics
Speaker: Stefan Hickel, Delft University of Technology
Abstract: Accurate simulations of high-pressure transcritical fuel sprays are essential for the design and optimization of next-generation gas turbines, internal combustion engines, and liquid propellant rocket engines. For these applications, the accurate modelling of complex real-gas effects in high-pressure environments, especially the hybrid subcritical-to-supercritical mode of evaporation during the mixing of fuel and oxidizer, is very important and challenging. In this webinar, we present a novel modeling framework for high-fidelity simulations of reacting and non-reacting transcritical fuel sprays. The high-pressure jet disintegration is modeled using a diffuse interface method with multiphase thermodynamics, which combines multi-component real-fluid volumetric and caloric state equations with vapor-liquid equilibrium calculations. The proposed method represents turbulent fluid flows at supercritical fluid states as well as condensation and evaporation at transcritical multiphase fluid states with very high accuracy and unprecedented computational efficiency without relying on any semi-empirical break-up and evaporation models. Combustion source terms are evaluated using a finite-rate chemistry model, including real-gas effects based on the fugacity of the species in the mixture. The adaptive local de-convolution method (ALDM) is used as a physically consistent turbulence model for large-eddy simulation (LES). LES results are validated by comparison with available experimental data for the reacting and non-reacting Engine Combustion Network (ECN) benchmark Spray A at transcritical operating conditions.
The meeting link is available here.