Regensburg 2022 – wissenschaftliches Programm

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VA: Fachverband Vakuumphysik und Vakuumtechnik

VA 1: Rarefied gas dynamics and novel numerical approaches

VA 1.2: Vortrag

Montag, 5. September 2022, 10:10–10:50, H12

Transient modeling of the gas flows in the gas injection systems of fusion reactors — •Christos Tantos, Stylianos Varoutis, and Christian Day — Karlsruhe Institute of Technology, Karlsruhe, Germany

This work presents an assessment of the flow evolution inside the gas pipes of the gas injection system (GIS) of fusion reactors during a control action. A successful gas injection system design requires on the one hand the ability to meet the technical requirements under steady state conditions that are in line with the operating requirements of the reactor and on the other hand the appropriate prediction of the dynamic change of the system response times. In this framework, in the present work a state-of-the-art methodology has been utilized analyzing the transient behavior of the argon and deuterium-tritium gas flows in the GIS of DEMO (DEMOnstration Power Plant) fusion reactor. The applied methodology allows for an accurate description of the gas flow in the whole range of the gas rarefaction and compared to other widely applied particle-based approaches it requires low computational effort using an ordinary workstation. The main output of the present work, namely the delay time, representing the time it takes the flow to reach the outlet as well as the time needed to recover steady state conditions, is estimated in a wide range of the operating conditions and ratios length-to-diameter of the GIS tubes. The obtained data show that the response times of the GIS are unfeasibly high and this may have a strong impact on the design of the piping of the DEMO gas injection system.