VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • Thermal modelling of ITER first wall [Elektronski vir]
    Brank, Matic ...
    The ITER tokamak is designed to produce fusion grade plasmas for durations of hundreds to thousands of seconds. These long durations require active cooling of the wall armour directly facing the ... plasma. Such actively cooled plasma-facing components (PFCs) have strict limits on the allowed stationary surface heat flux densities in order to avoid critical heat fluxes at interfaces with the cooling channels. These flux densities are lower for the beryllium (Be) main chamber PFCs than for the tungsten divertor targets and must be carefully monitored from the beginning of ITER operations, when the Be first wall panels (FWP), notably in the inboard equatorial region, will be used for plasma start-up. It is thus extremely important to provide assessments of likely heat loading and thermal transfer within the Be armour for incorporation into real time plasma control algorithms. This article describes a new module in the SMITER magnetic field line following code framework [1] for finite element calculations of thermal transfer in FWPs subject to heat flux distributions on the front surface computed by SMITER. The heat fluxes are mapped onto a 3D model of the panel subcomponents, comprising, for each FWP, a series of poloidally stacked “fingers”, each of which is made up of a cooled substrate, to which are bonded individual Be tiles. The ITER FWPs come in two variants: Enhanced (EHF) and Normal (NHF) panels. Models for both are included in the SMITER thermal module. Computation of static temperatures on the FWP surface is performed using the open source FEM package ELMER [2], which is embedded in the SMITER GUI environment. For selected EHF FWPs, where plasma-wall interactions are expected to be highest, the full Be tile castellation geometry is included in the CAD model, yielding a computationally heavy task for field line tracing and thermal transfer, but providing a much higher fidelity representation of the surface temperature distribution than obtained with the standard smooth surface profile used for most heat flux distribution estimates. The GEOM module, also part of SMITER GUI environment and having an extensive library for Python scripting, is used to prepare CAD models for the structures below the Be castellations. Meshing of the models is performed with SMESH, a further module embedded in the SMITER GUI. A full tutorial from CAD modelling and meshing to temperature calculation is presented in this article together with the result of some benchmarking of the new framework against specific existing thermal calculations provided by the ITER Organization.
    Vir: NENE 2019 [Elektronski vir] : 28th International Conference Nuclear Energy for New Europe : September 9-12, Portorož, Slovenia : proceedings (F. 8)
    Vrsta gradiva - prispevek na konferenci ; neleposlovje za odrasle
    Leto - 2019
    Jezik - angleški
    COBISS.SI-ID - 179876867

    Povezava(-e):

    https://arhiv.djs.si/nene2019/proceedings-html/PDF/NENE2019_702.pdf

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