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Strategies for Quantitative Planar Laser-Induced Fluorescence of NH Radicals in Flames

In English

Författare

Summary, in English

Laser-induced fluorescence imaging of the NH radical using excitation in the (0-0) and (1-0) vibrational bands of the A3Π-X3Σ– electronic transition is characterized in premixed NH3-air flames. Filtered detection for excitation of the (1-0) band is found to be beneficial for measurement conditions with a challenging background and/or interferences. Concentration evaluation for excitation in the (0-0) and (1-0) bands is feasible by means of fully or partially saturated fluorescence, respectively. Detection limits of a few tens of ppm for averaged data and 100 ppm on a single-shot basis was achieved for 3-cm imaging size using both excitation alternatives. Thinning and broadening of the NH layer in a turbulent flame indicate turbulence/flame chemistry coupling, which occurred at lower turbulence levels compared with hydrocarbon combustion. Fluorescence imaging of the NH flame-front marker in such flames thus provide an experimental configuration for detailed studies of turbulence/flame chemistry interactions.

Publiceringsår

2016-05-03

Språk

Engelska

Sidor

529-541

Publikation/Tidskrift/Serie

Combustion Science and Technology

Volym

188

Issue

4-5

Dokumenttyp

Artikel i tidskrift

Förlag

Taylor & Francis

Ämne

  • Atom and Molecular Physics and Optics
  • Energy Engineering

Nyckelord

  • Ammonia combustion
  • Laser-induced fluorescence
  • NH radical

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0010-2202