Christoph Spijker
@unileoben.ac.at
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Senthilathiban Swaminathan, Christoph Spijker, Markus Gruber, Irmela Kofler, and Harald Raupenstrauch
MDPI AG
A two-step numerical concept was developed for modelling combustion and predicting nitrogen oxide emissions. The model was validated by the Sandia flame D experiment and with measurement data from burners on industrial furnaces. In this paper, the developed model was implemented to evaluate the influence of hydrogen blending with natural gas up to 40 vol.% on an industrial burner with oxidizer temperatures at 300 K and 813 K to assess the performance of the burner without altering the power output of the burner. An experimental test facility is under construction, and the feasibility of using this industrial burner on the test facility with different fuel mixtures was analyzed. Temperature, flow field, and emission characteristics were investigated. Using 40 vol.% hydrogen with natural gas resulted in a decrease of 14.82% in CO2 emissions and an increase of in 16.1% NO emissions when combusted with air at 300 K. The temperature profile indicated that the burner produces a symmetrical flame profile with preheated air and an asymmetrical flame profile with ambient air.
Yangyue Pan, Christoph Spijker, and Harald Raupenstrauch
Elsevier BV
Christoph Spijker, Werner Pollhammer, and Harald Raupenstrauch
Wiley
Stefan Puttinger, Christoph Spijker, Simon Schneiderbauer, Stefan Pirker, Georg Meyer, Christoph Buchner, and Andreas Kerbl
Elsevier BV
Senthilathiban Swaminathan, Christoph Spijker, Zlatko Raonic, Michael Koller, Irmela Kofler, and Harald Raupenstrauch
Elsevier BV
Stefanie Tomasch, Nedunchezhian Swaminathan, Christoph Spijker, and Ivar S. Ertesvåg
Informa UK Limited
Yangyue Pan, Christoph Spijker, and Harald Raupenstrauch
Elsevier BV
Stefanie Tomasch, Nedunchezhian Swaminathan, Christoph Spijker, and Ivar S. Ertesvåg
Informa UK Limited
This study presents an algebraic combustion closure for Large eddy simulation (LES) exhibiting attributes of simplicity and simultaneous accuracy under realistic combustion conditions. The model makes use of the interlink between the reaction and dissipation rates in premixed turbulent combustion but relaxes the thin flame assumption by considering finite-rate chemistry effects in the small-scale turbulence structure. The core idea of the approach is to approximate the reaction progress in the unresolved spectrum of wave lengths and to use it within a filtered reaction rate expression. The model is implemented in OpenFOAM 4.0 and is tested on a turbulent, premixed flame behind a bluff-body, applying an LES approach for turbulence modelling. The cross comparison of velocity, temperature and composition data with experiments and a well-investigated combustion model in literature reveals competitive performance of the new model. Especially in the near-field of the bluff body flame, corresponding to thin and moderately thickened flame regions, its ability to capture the flame structure is highly promising. The chosen, partly explicit approach to recover the temperature from the transported sensible enthalpy, involving a strong coupling between filtered reaction and heat release rate, also shows advantages over obtaining the temperature from presumed probability density functions.
Christoph Spijker, Senthilathiban Swaminathan, and Harald Raupenstrauch
Wiley
Nitrogen oxides emissions are a concern in industrial furnaces, due to constantly increasing environmental requirements. A cost‐effective way to reduce emissions is an optimization of the burners in the furnace using computational fluid dynamics (CFD) methods. Still, state of the art approaches are computationally too expensive for real scale geometries such as industrial furnaces, or can not predict the nitrogen concentrations with sufficient accuracy. Therefore, the development of nitrogen oxides post‐processors was defined in K1‐Met projects in 2012. Currently, there are three different variations available, where the generation 2.0+ is the latest development.
Senthilathiban Swaminathan, Christoph Spijker, Harald Raupenstrauch, Irmela Kofler, and Michael Koller
Elsevier BV
Franz Edler, Bernhard Geier, Wolfgang Reiter, Johannes Rieger, Christoph Spijker, and Harald Raupenstrauch
Wiley
Das Atmospharenpartikel-Kinetikmodell ist ein hilfreiches Werkzeug, um die Partikelkinetik in Abhangigkeit der Verweilzeit zu bestimmen. Dieses Modell ermoglicht die Quantifizierung verschiedenster Einflussparameter in einer RecoDust-Pilotanlage zur pyrometallurgischen Aufbereitung von zinkhaltigen Stauben. Dabei sind die wichtigsten Parameter die Temperatur, Gaszusammensetzung und -geschwindigkeit, Partikelgrose sowie die Partikeleingangstemperatur. Die Grose des gewahlten Betrachtungsraumes orientiert sich an der Grose des vorhandenen Reaktors. Die Fluidphase wird als Euler-Phase betrachtet und die Partikel uber einen Lagrange-Ansatz modelliert. Als Ergebnis wird die Anderung der Zusammensetzung in Abhangigkeit von der Reaktionsgeschwindigkeit in dem Partikel fur gegebene Parameter erhalten.
Christoph Spijker and Harald Raupenstrauch
Elsevier BV
Franz Edler, Bernhard Geier, Wolfgang Reiter, Johannes Rieger, Christoph Spijker, and Harald Raupenstrauch
Elsevier BV
Werner Pollhammer, Christoph Spijker, Jakob Six, Daniel Zoglauer, and Harald Raupenstrauch
Elsevier BV