ISSN Online: 2688-7231
ISBN Online: 978-1-56700-524-0
Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
Assessment of BML flamelet and EDM combustion models for turbulent premixed hydrogen combustion using FLUIDYN-MP
During postulated severe accident conditions in reactor containment of water cooled nuclear reactors, ignition of highly combustible hydrogen-air mixtures may generate large pressure and temperature loads. This could disrupt the performance of engineered safety systems and potentially threaten the structural integrity of the reactor containment. Therefore, numerical analysis of postulated hydrogen combustion forms an integral part of reactor safety studies.
Combustion itself is a complex multiphysics phenomenon and 3D CFD analysis of hydrogen combustion in a large scale geometry such as reactor containment is computationally expensive. Although a host of combustion models are available in open literature, it is prudent to employ simplified models, with appropriate validation, for analysis of broad range of accidental conditions with reasonable computational resources. Numerical simulations of hydrogen combustion experiment (RUN153) in ENACCEF-France have been carried out using FLUIDYN-MP commercial code. One-step hydrogen-air reaction based two combustion models namely Eddy Dissipation Model (EDM) and modified Bray-Moss-Libby (BML) model have been assessed against the experimental data for pressure transient and flame arrival time at different locations. It has been found that both models qualitatively capture the flame propagation in the ENACCEF vessel. However, the modified BML model performs relatively better with respect to the experimental data.