tesis de maestría.page.titleprefix Large eddy and rans simulations of V-RIB structured cooling channels of the first wall of future fusion reactors
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Date
2020
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Abstract
This work contributes to the development of the future fusion reactor DEMO. It investigates the
cooling of the first wall blankets by rib structured cooling channels. For this purpose, RANS simulations
using the 𝑘 − 𝜔 − 𝑆𝑆𝑇 model and the Reynolds Stress Model as well as Large Eddy Simulation were
carried out on a channel with V-shaped ribs on one side at a Reynolds number of 𝑅𝑒 = 1.56 ⋅ 10
As a working fluid helium was used at an operating pressure of 𝑝 = 8 𝑀𝑃𝑎. The relative roughness of the
channel was 𝑒⁄𝐷ℎ = 0.0461 and the rib pitch was 𝑝⁄𝑒 = 10. The focus of the analysis of the results
has been on heat transfer quantities, pressure loss and flow patterns. It was shown that the rib induced
vortical structures that were associated with a large increase in heat transfer downstream of the rib
but also caused a heat transfer deterioration directly behind it. The comparison between the
simulations has shown that the 𝑘 − 𝜔 − 𝑆𝑆𝑇 model resolves well the magnitude of the averaged heat
transfer but fails to reproduce the flow patterns and friction factor accurately when compared to the
Large Eddy Simulation. On the other side, the Reynolds Stress Model showed better accuracy resolving
the flow patterns and friction factor but strongly underpredicts the heat transfer for the given case.
Additionally, the results of the Large Eddy simulation have been compared to previous simulation
results that have been conducted on a smooth and a rib structured channel with 𝑒 = 0.9 𝑚𝑚. It was
shown that reducing the rib height led to a slight decrease in heat transfer on the rib structured side
but also reduced the pressure loss significantly.
Description
Tesis Energía y Ambiente (maestría) - Instituto Tecnológico de Buenos Aires - Karlsruher Institut für Technologie, Karlsruhe, 2020
Keywords
REACTORES NUCLEARES, ENERGIA NUCLEAR, FUSION NUCLEAR