Effects of optical diagnostic techniques on the accuracy of laminar flame speeds measured from Bunsen flames: OH∗ chemiluminescence, OH-PLIF and acetone/kerosene-PLIF

Yi Wu, Vincent Modica, Xilong Yu, Fei Li, Frédéric Grisch

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摘要

The effects of optical diagnostic techniques on the accuracy of laminar flame speed measured from Bunsen flames were investigated. Laminar flame speed measurements were conducted for different fuel/air mixtures including CH4/air, acetone/air and kerosene (Jet A-1)/air in applying different optical diagnostic techniques, i.e. OH∗ chemiluminescence, OH-PLIF and acetone/kerosene-PLIF. It is found that the OH∗ chemiluminescence imaging technique cannot directly derive the location of the outer edge of the fresh gases and it is necessary to correct the position of the OH∗ peak to guarantee the accuracy of the measurements. OH-PLIF and acetone/kerosene-PLIF respectively are able to measure the disappearance of the fresh gas contour and the appearance of the reaction zone. It shows that the aromatic-PLIF technique gives similar laminar flame speed values when compared with those obtained from corrected OH∗ chemiluminescence images. However, discrepancies were observed between the OH-PLIF and the aromatic-PLIF techniques, in that OH-PLIF slightly underestimates laminar flame speeds by up to 5%. The difference between the flame contours obtained from different optical techniques are further analysed and illustrated with 1D flame structure simulation using detailed kinetic mechanisms.

源语言英语
文章编号015204
期刊Measurement Science and Technology
29
1
DOI
出版状态已出版 - 1月 2018
已对外发布

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