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Multi-Dimensional Numerical Analysis of Flow Instabilities in 3D-Shaped Honeycomb Absorbers

Broeske, Robin Tim and Schwarzbözl, Peter and Hoffschmidt, Bernhard (2022) Multi-Dimensional Numerical Analysis of Flow Instabilities in 3D-Shaped Honeycomb Absorbers. Solar Energy (247), pp. 86-95. Elsevier. doi: 10.1016/j.solener.2022.10.007. ISSN 0038-092X.

[img] PDF - Only accessible within DLR bis 15 November 2024 - Postprint version (accepted manuscript)
[img] PDF - Only accessible within DLR - Published version

Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0038092X22007411


Considered a valid alternative to other receiver types, open volumetric receivers for central tower power plants have been developed and researched for multiple decades. 3D-Shaped absorber geometries, made possible by modern manufacturing technologies, particularly offer the promise of high thermal efficiencies. Yet, volumetric absorbers carry the inherent risk of flow instabilities, which can lead to a total failure of the receiver due to local overheating. Therefore, a numerical, multi-dimensional methodology for the flow stability analysis of volumetric absorbers is proposed. The first stage of the methodology applies an 1D LTNE continuum model to quantify the general pressure loss characteristic of an absorber and identifies critical pressure drop levels with potential for flow instability. These levels are tested as part of the second analysis stage using a discrete 3D CFD model against different irradiation and flow perturbations. If the absorber is able to compensate the disturbances, its flow behavior is deemed stable. Otherwise, the absorber geometry is considered susceptible to local overheating due to flow instability. The new methodology has been validated against two reference absorbers with known stable resp. unstable flow behavior. Further, the new approach was applied to analyze the flow stability of two 3D-shaped honeycomb absorber geometries. It was shown that the geometric features of 3D-shaped absorbers can directly improve the flow stability, but do not prevent instabilities automatically. Therefore, a flow stability analysis should be included in design/optimization processes of new volumetric absorbers alongside a maximization of the thermal efficiency.

Item URL in elib:https://elib.dlr.de/189065/
Document Type:Article
Title:Multi-Dimensional Numerical Analysis of Flow Instabilities in 3D-Shaped Honeycomb Absorbers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Broeske, Robin TimUNSPECIFIEDhttps://orcid.org/0000-0001-5157-6251UNSPECIFIED
Schwarzbözl, PeterUNSPECIFIEDhttps://orcid.org/0000-0001-9339-7884UNSPECIFIED
Date:15 November 2022
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 86-95
Keywords:open volumetric receiver, flow stability, CFD simulation, discrete 3D model, 1D LTNE model
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Smart Operation
Location: Jülich
Institutes and Institutions:Institute of Solar Research > Solar Power Plant Technology
Deposited By: Broeske, Robin Tim
Deposited On:28 Oct 2022 10:12
Last Modified:28 Oct 2022 10:12

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