The main goal is to develop a multi-physics methodology, coupled with Computational Fluid Dynamics (CFD) research, for the study of the penetration of the liquid phase of fluid Fire-Suppression Agents (FSA) in a cargo hold of Large Passenger Aircraft (LPA). This penetration is expected to be accompanied by phase-change due to the rapid decompression of the FSA when it leaves the high-pressure region of the storage and delivery system and enters the low-pressure region outside the nozzle. This process causes the atomization and the fast vaporization of the FSA in a spray flow. Such fast phase change and related cooling of the environment strongly affect the penetration of the liquid phase of the FSA. The usefulness and efficiency of the developed methodology will be evaluated using the following parameters: Penetration of the liquid phase of the fire suppression agent into the environment. Velocity profiles of the resulting gas mixture downwind of the phase-change jet zone. Temperature of the resulting gas mixture downwind of the phase-change jet zone. Composition of the resulting gas mixture downwind of the phase-change jet zone. Due to the high sensitivity of multi-phase dispersed flows simulations with phase-change on the parameters defining the heat transfer and evaporation of the droplets, the implemented models and methodologies will be assessed. The present RIA topic has several objectives whose fulfilment should lead to the achievement of the main goals of the project: 1. Identify two-phase and phase-change models relevant for the project, based on literature survey. 2. Perform preliminary validation of some of the selected models, using experimental data available in the literature, and identify the most suitable model or models. 3. Implement and verify the chosen models in a software library and couple them with CFD softwares. 4. Validate the methodology and assess the toolchain capabilities of the chosen models for various FSA supply strategies. Re-evaluate the models if necessary. 5. Perform a parametric study with various FSA supply strategies and assess the toolchain capabilities of the chosen models and their reliability limits.
Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016
Programa Estatal de I+D+i Orientada a los Retos de la Sociedad