Böckle, S.; Kazenwadel, J.; Kunzelmann, T.; Shin, D.-I.; Schulz, Christof; Wolfrum, J.:
Simultaneous single-shot laser-based imaging of formaldehyde, OH, and temperature in turbulent flames
2000
In: Proc. Combust. Inst., Jg. 28 (2000), Heft Pt. 1, S. 279 - 286
Artikel/Aufsatz in Zeitschrift2000Maschinenbau
Titel:
Simultaneous single-shot laser-based imaging of formaldehyde, OH, and temperature in turbulent flames
Autor(in):
Böckle, S.; Kazenwadel, J.; Kunzelmann, T.; Shin, D.-I.; Schulz, ChristofLSF; Wolfrum, J.
Erscheinungsjahr
2000

Abstract:

Single-shot formaldehyde (CH2O) laser-induced fluorescence (LIF) imaging measurements in turbulent flames were performed by using XeF excimer laser excitation in the 410 transition of the A1A2-X1A1 electronic system at 353 nm. Background contributions to the CH2O LIF detection were assessed in spectroscopic measurements. Simultaneous two-dimensional mapping of OH LIF, CH2O LIF, and temp. fields was carried out in a std. Bunsen flame. The zones of peak heat release rate localized via the product of OH and CH2O LIF intensities correlated with areas of intermediate temps. In addn., single-shot imaging of the transient formaldehyde distribution was performed in a 150 kW natural gas swirl burner. Formaldehyde distributions in strongly turbulent swirl flames differed significantly from thin layers found in laminar and weak turbulent flames, indicating the presence of low-temp. chem. in preheated gas pockets. The CH2O distribution measured in the swirl flame was compared with averaged fields of temp., OH, and NO concns.