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Investigation of the impact of imposed air inlet velocity oscillations on the formation and oxidation of soot using simultaneous 2-Colour-TIRE-LII

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Abstract

The response of non-premixed swirling flames to acoustic perturbations at various frequencies (0–350 Hz) and the impact of imposed air inlet velocity oscillations on the formation and oxidation of soot are investigated. The results obtained from these flames are of special interest for “rich-quenched-lean” (RQL) combustion concepts applied in modern gas turbines. In RQL combustion, the fuel is initially oxidized by air under fuel-rich conditions in a first stage followed by a fuel-lean combustion step in a second stage. To mimic soot formation and oxidation in RQL combustion, soot particle measurements in highly turbulent, non-premixed swirling natural gas/ethylene-confined flames at imposed air inlet velocity oscillations are performed using simultaneous 2-Colour-Time-Resolved-Laser-Induced Incandescence (simultaneous 2-Colour-TIRE-LII). The latter technique is combined with line-of-sight averaged OH*-chemiluminescence imaging, measurements of the velocity field by high-speed particle imaging velocimetry under reactive combustion conditions and measurements of the mean temperature field obtained by a thermocouple. A natural gas/ethylene mixture (Φ = 1.56, 42 % C2H4, 58 % natural gas, P th = 17.6 kW at atmospheric pressure) is used as a fuel, which is oxidized by air under fuel-rich conditions in the first combustion chamber.

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Authors and Affiliations

  1. Engler-Bunte-Institute, Division of Combustion Technology, Karlsruhe Institute of Technology (KIT), Kaiserstrasse 12, 76131, Karlsruhe, Germany

    A. Aleksandrov & H. Bockhorn

  2. Institute of Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Kaiserstrasse 12, 76131, Karlsruhe, Germany

    R. Suntz

Authors
  1. A. Aleksandrov
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  2. R. Suntz
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  3. H. Bockhorn
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Corresponding author

Correspondence to R. Suntz.

Appendix: Nomenclature

Appendix: Nomenclature

Latin symbols

c:

Speed of light 3 × 108 (m/s)

E(m):

Complex refractive index function for absorption (–)

f v :

Soot particle volume fraction (–)

h :

Planck’s constant 6.6256 × 10−34 (J s)

I :

LII signal intensity (W/m3)

k B :

Boltzmann’s constant 1.3806 × 10−23 (J/K)

K cal :

Calibration constant (–)

L :

Length (m)

m :

Refractive index of soot (–)

Greek letters

ε :

Spectral emissivity of soot layer (–)

λ :

Wavelength (m)

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Aleksandrov, A., Suntz, R. & Bockhorn, H. Investigation of the impact of imposed air inlet velocity oscillations on the formation and oxidation of soot using simultaneous 2-Colour-TIRE-LII. Appl. Phys. B 119, 777–795 (2015). https://doi.org/10.1007/s00340-015-6117-x

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  • DOI: https://doi.org/10.1007/s00340-015-6117-x

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