Zonal Simulation of Air Flow Dynamics in the Leakage Case of a Liquid Hydrogen Tank in a Hybrid-Electric Regional Aircraft ^†

This study investigates the spread and removal of emissions from a liquid hydrogen tank in a leakage case in the rear area of a hybrid-electric regional aircraft. The aim of the research is to determine the air volume flows that a fan is required to supply to keep the hydrogen concentration below 1% by volume in the event of a leak. In addition, the fan position with the best possible hydrogen removal is to be identified. For this purpose, the geometry of a 10.6 m³ sized tank and compartment is reconstructed, and a zonal simulation model is created that represents the air flow patterns within the domain. Using this simulation model, a comprehensive parameter study is carried out in which different configurations of fan arrangements and leakage scenarios are simulated. The results of these simulations are analyzed and compared to determine the most efficient ventilation to maintain safe hydrogen concentrations.