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On the influence of wind on cavity receivers for solar power towers: Flow visualisation by means of background oriented schlieren imaging

Stadler, Hannes and Flesch, Robert and Maldonado Quinto, Daniel (2017) On the influence of wind on cavity receivers for solar power towers: Flow visualisation by means of background oriented schlieren imaging. Applied Thermal Engineering, 113. Elsevier. ISSN 1359-4311

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Official URL: http://www.sciencedirect.com/science/article/pii/S1359431116332720

Abstract

In previous studies the influence of wind on convective losses of a solar cavity receiver has been investigated experimentally and numerically. It was found that in the backward facing cavity a reduction of convective losses with increasing wind speed can occur. In this short communication we give an explanation for these results by analysing the flow structure with the background oriented schlieren (BOS) method. For image analysis a gradient-based approach following Lucas and Kanade (1981) has been implemented. With a coarse to fine iterative strategy density gradients resulting in pixel shifts of several pixels in the image plane are determinable. The results show good agreement with theoretical analyses. The developing plume is well defined and with increasing wind speed disturbances of the plume structure are clearly resolved. Moreover, in the natural convection cases the transition from laminar to turbulent flow has been made visible

Item URL in elib:https://elib.dlr.de/108539/
Document Type:Article
Title:On the influence of wind on cavity receivers for solar power towers: Flow visualisation by means of background oriented schlieren imaging
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Stadler, HannesHannes.Stadler (at) dlr.deUNSPECIFIED
Flesch, RobertRobert.Flesch (at) dlr.deUNSPECIFIED
Maldonado Quinto, DanielDaniel.MaldonadoQuinto (at) dlr.deUNSPECIFIED
Date:25 February 2017
Journal or Publication Title:Applied Thermal Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:113
Publisher:Elsevier
Series Name:Elsevier Ldt
ISSN:1359-4311
Status:Published
Keywords:Solar cavity receiver; Mixed convection; BOS; Cryogenic wind tunnel
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Advanced Heat Transfer Media (old)
Location: Stuttgart
Institutes and Institutions:Institute of Solar Research > Punktfokussierende Systeme
Deposited By: Uhlig, Tamara
Deposited On:01 Dec 2016 19:38
Last Modified:06 Sep 2019 15:16

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