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Induced Infrared Thermography: Flow visualizations under the extreme conditions of an open volumetric receiver of a solar tower

Tiddens, Arne and Risthaus, Kai and Röger, Marc and Stadler, Hannes and Hoffschmidt, Bernhard (2017) Induced Infrared Thermography: Flow visualizations under the extreme conditions of an open volumetric receiver of a solar tower. International Journal of Heat and Fluid Flow, 65, pp. 105-133. Elsevier. DOI: 10.1016/j.ijheatfluidflow.2017.04.002 ISSN 0142-727X

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Official URL: http://www.sciencedirect.com/science/article/pii/S0142727X16305872?via%3Dihub

Abstract

Current measurement techniques do not allow the visualization of the return air flow of open volumetric receivers in solar tower power plants. The reason is that the region of interest is irradiated by concentrated solar radiation and is located on top of a tower. Therefore, a novel method of measurement, the Induced Infrared Thermography (IIT) is introduced within this paper. With this method the return air can easily be observed with an infrared camera. As air has a very low emissivity in the infrared region the activity has to be induced by the addition of an infrared-active component, here carbon dioxide. The temperature of the infrared-active component has the greatest influence on the signal strength but the mole fraction of the component and the distance to the infrared camera are also important. Due to temperature restrictions, the measured signal to noise ratio is low and therefore several post-processing steps have to be conducted to visualize the return air. The most important step for the visualization is subtracting a background image. Furthermore, a video filter is employed in order to remove noise. A time series of ITT images can be used to obtain information on the velocity fields of the flow. The process, called Infrared Image Velocimetry (IRIV) here, is similar to Particle Image Velocimetry (PIV) and is applied in this paper to external fluid flows of the open volumetric receiver. As IRIV is in an early stage of development the depicted results are treated as qualitative vector fields.

Item URL in elib:https://elib.dlr.de/115588/
Document Type:Article
Title:Induced Infrared Thermography: Flow visualizations under the extreme conditions of an open volumetric receiver of a solar tower
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Tiddens, Arnearne.tiddens (at) dlr.dehttps://orcid.org/0000-0003-3714-3008
Risthaus, KaiKai.Risthaus (at) dlr.deUNSPECIFIED
Röger, MarcMarc.Roeger (at) dlr.dehttps://orcid.org/0000-0003-0618-4253
Stadler, Hanneshannes.stadler (at) dlr.dehttps://orcid.org/0000-0001-5122-4221
Hoffschmidt, BernhardBernhard.Hoffschmidt (at) dlr.deUNSPECIFIED
Date:June 2017
Journal or Publication Title:International Journal of Heat and Fluid Flow
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:65
DOI :10.1016/j.ijheatfluidflow.2017.04.002
Page Range:pp. 105-133
Publisher:Elsevier
ISSN:0142-727X
Status:Published
Keywords:Flow visualization; Air return ratio; Tracer gas; Solar air receiver; Induced Infrared Thermography (IIT); Infrared Image Velocimetry (IRIV)
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Concentrating Solar Thermal Technology
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Advanced Heat Transfer Media
Location: Köln-Porz
Institutes and Institutions:Institute of Solar Research > Qualification
Deposited By: Kruschinski, Anja
Deposited On:20 Nov 2017 14:06
Last Modified:06 Sep 2019 15:26

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