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1. Schematic of the shock tube apparatus. Top panel: the driver and driven sections. Middle panel: incident shock wave. Bottom panel: reflected shock wave.

1. Schematic of the shock tube apparatus. Top panel: the driver and driven sections. Middle panel: incident shock wave. Bottom panel: reflected shock wave.

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The world’s ever-increasing needs for energy, currently fulfilled primarily by the combustion of hydrocarbon fuels, are demanding development of more efficient and cleaner combustion processes, which ultimately requires improved knowledge of fundamental combustion kinetics. Present in the combustion of most hydrocarbon fuels, aldehydes are importan...

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... Ultimately, the residual uncertainty in the absolute absorbance associated with this subtraction amounted to no more than 1% and had a negligible effect on parameter calculations. For applications that expect significant formation of formaldehyde or acetaldehyde, especially at temperatures lower than those encountered in this study, special care must be taken to subtract the associated aldehyde absorption as well, using techniques such as those outlined by Wang et al. [25] . ...
Article
The collision-induced broadening (2γOH–A) and shift (δOH–A) parameters of hydroxyl radical (OH) with two collisional partners—argon and nitrogen—and their associated temperature-dependence coefficients (nA and mA, respectively), have been measured in a series of shock tube experiments. The Q1(5) OH transition, a member of the A²Σ – X²Π (0, 0) rovibronic band with a line-center wavelength near 308.6 nm, represents an ideal target for quantitative spectroscopy in combustion applications, owing to its strength and degree of relative spectral isolation. Narrow-width tunable UV light was used to sample the Q1(5) lineshape profile across 8–10 wavelengths. The data were subsequently fit to the Voigt lineshape model at the fixed temperature, pressure and mixture composition. Measurements are presented for 2γOH–Ar δOH–Ar, nAr, and mAr, recommended for T = 1300–2000 K, as well as 2γOH–N2 δOH–N2 nN2, and mN2, recommended for T = 1600–2000 K. The Q1(5) lineshape was also measured at pressures of 45 and 95 atm, for which application of the Voigt model yielded values of 2γOH–Ar and δOH–Ar that were consistent with lower-pressure measurements, supporting the validity of the lineshape model and, particularly, the diagnostic in question at such pressures.