کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4764351 | 1423551 | 2017 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A new diagnostic for hydrocarbon fuels using 3.41-µm diode laser absorption
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We report the development of a novel laser absorption diagnostic for accurate, time-resolved and in situ measurement of various hydrocarbon fuels in combustion systems. This diagnostic method utilized a wavelength-tunable interband cascade laser operated near 3.41â¯Âµm, providing improved performance in several aspects over the conventional 3.39-μm He-Ne gas laser diagnostic. First, it enabled a simplified and more compact experimental setup that significantly reduced the measurement complexity. Second, it improved the long-term stability over the 3.39-μm diagnostic by at least a factor of 2, leading to substantially reduced measurement uncertainties. Lastly, the new diagnostic also avoided a cluster of CH4 transitions that coincide with the He-Ne wavelength, and hence minimized CH4 interference in other hydrocarbon measurements. Absorption cross-sections of a variety of hydrocarbons at both 3.39 and 3.41â¯Âµm were measured in a high-purity shock tube over 531-1659â¯K, 0.34-3.1â¯atm, and reported here as functions of temperature. Example applications of this new diagnostic in shock tube pyrolysis studies of methylcyclohexane, n-heptane and iso-octane are also presented. These studies have yielded an improved value of the overall decomposition rate constant of methylcyclohexane as kdâ¯=â3.3âÃâ¯1015 exp(â38000â¯K/T)â¯sâ1â¯+â28%/â34%, which is valid over 1260-1400â¯K and near 1.5â¯atm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 186, December 2017, Pages 129-139
Journal: Combustion and Flame - Volume 186, December 2017, Pages 129-139
نویسندگان
Shengkai Wang, Thomas Parise, Sarah E. Johnson, David F. Davidson, Ronald K. Hanson,