CFD Analysis for H₂ Flame Propagation during Spray Operation in the THAI Facility

In this paper discussion is focused on the three tests HD-30, HD-31, and HD-32.1 conducted in the THAI test facility to investigate the influence of water spray operation on hydrogen deflagration behavior. Test results have been extensively used by the project partners for further development and validation of computational codes within the frame of the OECD THAI-2 project. In order to quantify the influence of spray operation on hydrogen deflagration behavior, test results are compared with the reference tests conducted with same initial thermal-hydraulic conditions but without spray in the frame of OECD-THAI project. KAERI performed the CFD calculation of the tests HD-30, HD-31, and HD-32..1 conducted in the THAI facility to observe the influence of spray operation on hydrogen combustion for further development and validation of computational codes within the frame of the OECD THAI-2 project. We accurately simulated the measured peak pressure in the tests with an error range of about 5%. However, we cannot accurately simulate the disturbance of the chemical reaction of H₂-Air mixture owing to the spray water. Thus, the calculated gas temperature during the hydrogen combustion was overestimated In order to reduce this discrepancy between the CFD results and test data, we have to modify the correlation of the turbulent flame speed in the BVM for simulating the hydrogen deflagration during the spray operation