An experimental study of probe distortions to the structure of one-dimensional flames

✍ Scribed by Owen I. Smith; David W. Chandler

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 654 KB
• Volume: 63
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(86)90108-2

✦ Synopsis

In this study we have examined the effect of a molecular-beam mass-spectrometer sampling probe on the structure of a fiat H2-O2-Ar flame doped with a small amount of HCN. Relative CN concentration and CN rotational temperature fields were obtained by laser-induced fluorescence using the R(0) through R( 24) lines of the B-X transition around 385 nm. Measurements were made for several probe positions, both upstream and downstream of the location of peak unperturbed concentration. Reduced CN concentrations were observed within five orifice hydraulic diameters of the probe tip; however, a corresponding perturbation of rotational temperature was not. Suction at the probe orifice did not measurably effect either result, indicating that residence time perturbations do not play a major role. Perturbations of the CN concentration field are discussed in terms of catalyzed recombination of the major flame radicals on the probe surface, coupled with diffusive transport and gas phase chemistry applicable to the CN radical.