The paper will use interface-resolved direct numerical simulation (DNS) to study the vaporization and combustion of n-heptane droplets in isotropic turbulence. This work marks a step forward in the simulation of spray combustion. In spray combustion, the fuel is injected as a liquid, vaporizes, and the vapor undergoes combustion. Historically spray combustion studies have been approached by assuming the fuel has pre-vaporized and then by performing detailed analysis on the gas phase chemistry. There have also been attempts to use Lagrangian models of droplets such as the Abramzon and Sirignano [1] model to better represent the spraying process. However, while the sophistication of combustion kinetics modeling has increased greatly over the last generation, the modeling of the multiphase flow aspect has not significantly improved. Only recently has there been a computational capability to perform interface-resolving simulation of multiphase flow heat and mass transfer. This capability has been due to advancements in both numerical algorithms and raw computational power. As part of a series of papers on the subject, the PI has developed a framework for such simulations including vaporization and more recently combustion [2—7]. This is the framework that will be demonstrated in this paper. However, DNS codes still have a while to go before being able to simulate the combustion of spray in realistic conditions. Accordingly, this work will focus on the practicality of performing these DNS studies, and it will discuss the utility of such studies for the purpose of combustion model development.
展开▼
