Experimental Study of Hydrogen Addition Effects on a Swirl-Stabilized Methane-Air Flame

Mao Li, Yiheng Tong, Jens Klingmann and Marcus Thern
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Mao Li: Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, Sweden
Yiheng Tong: Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, Sweden
Jens Klingmann: Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, Sweden
Marcus Thern: Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, Sweden

Energies, 2017, vol. 10, issue 11, 1-18

Abstract: The effects of H 2 addition on a premixed methane-air flame was studied experimentally with a swirl-stabilized gas turbine model combustor. Experiments with 0%, 25%, and 50% H 2 molar fraction in the fuel mixture were conducted under atmospheric pressure. The primary objectives are to study the impacts of H 2 addition on flame lean blowout (LBO) limits, flame shapes and anchored locations, flow field characteristics, precessing vortex core (PVC) instability, as well as the CO emission performance. The flame LBO limits were identified by gradually reducing the equivalence ratio until the condition where the flame physically disappeared. The time-averaged CH chemiluminescence was used to reveal the characteristics of flame stabilization, e.g., flame structure and stabilized locations. In addition, the inverse Abel transform was applied to the time-averaged CH results so that the distribution of CH signal on the symmetric plane of the flame was obtained. The particle image velocimetry (PIV) was used to detect the characteristics of the flow field with a frequency of 2 kHz. The snapshot method of POD (proper orthogonal decomposition) and fast Fourier transform (FFT) were adopted to capture the most prominent coherent structures in the turbulent flow field. CO emission was monitored with an exhaust probe that was installed close to the combustor exit. The experimental results indicated that the H 2 addition extended the flame LBO limits and the operation range of low CO emission. The influence of H 2 addition on the flame shape, location, and flow field was observed. With the assistance of POD and FFT, the combustion suppression impacts on PVC was found.

Keywords: swirl-stabilized flame; particle image velocimetry (PIV); proper orthogonal decomposition (POD); CO emission; lean blowout (LBO); precessing vortex core (PVC) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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