Experimental Radiation Investigations

Springer eBooks, pp. 499–522

Abstract

Abstract The experimental investigation of radiation in large combustion chambers is challenging due to the harsh environment and various radiation effects. This chapter presents experimental findings from several laboratory-scale studies that examined these effects separately. One goal was to determine the emissivity of the solid fuels and of ash utilising two setups: (1) observing a particle streak in a laminar flow reactor (LFR) and (2) studying laser-ignited fuel particles. The emissivity of both investigated solid fuels (Colombian bituminous coal and walnut shells) decreased with increasing temperature and progressing conversion, where mineral content has also an influence. For particles at higher levels of conversion, a final increase in emissivity was noticed. A spectroscopic experiment examined the emissivity of typical ash components and their mixtures. Carbonates and sulphates exhibited characteristic temperature- and wavelength-dependent emission trends, with specific emission bands attributed to CO $$_3$$ 3 and S–O functional groups. Another goal was to determine the index of refraction of the solid fuels experimentally. It was measured at room temperature and for burning particles applying inverse Mie-theory.

Authors 7

1. Lukas Pörtner corresponding

   Ruhr University Bochum

   Affiliation as printed

   Department of Energy Plant Technology, Ruhr-Universität Bochum, Bochum, Germany

2. Philipp Graeser

   Ruhr University Bochum

   Affiliation as printed

   Department of Energy Plant Technology, Ruhr-Universität Bochum, Bochum, Germany

3. Jeanette Gorewoda

   Ruhr University Bochum

   Affiliation as printed

   Department of Energy Plant Technology, Ruhr-Universität Bochum, Bochum, Germany

4. Matthias Albert Koch Aachen Institute of Heat and Mass Transfer

   RWTH Aachen University

   Affiliation as printed

   Institute of Heat and Mass Transfer, RWTH Aachen University, Aachen, Germany

5. Martin Schiemann

   Ruhr University Bochum

   Affiliation as printed

   Department of Energy Plant Technology, Ruhr-Universität Bochum, Bochum, Germany

6. Viktor Scherer

   Ruhr University Bochum

   Affiliation as printed

   Department of Energy Plant Technology , Ruhr-Universität Bochum , B ochum , Germany

7. Reinhold Kneer Aachen Institute of Heat and Mass Transfer

   RWTH Aachen University · Ruhr University Bochum

   Affiliation as printed

   Department of Energy Plant Technology , Ruhr-Universität Bochum , B ochum , Germany

   Institute of Heat and Mass Transfer , RWTH Aachen University , Aachen , Germany