Characterization of CO Thermochemistry in Incident Shockwaves

Cruden, Brett A ; Brandis, Aaron M ; MacDonald, Megan E

关键词: CARBON MONOXIDE;    CARBON COMPOUNDS;    THERMOCHEMISTRY;    SHOCK WAVES;    DISSOCIATION;    ATMOSPHERIC TEMPERATURE;    EMISSION SPECTRA;    SHOCK TUBES;    MARS ATMOSPHERE;   

RP-ID  :  ARC-E-DAA-TN57257

学科分类：原子、分子光学和等离子物理

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

Incident shock waves in pure CO have been characterized in the Electric Arc Shock Tube facility at NASA Ames Research Center. Spectrally and spatially resolved emission spectra characterize radiative signatures from CO in the VUV (Vacuum Ultra-Violet) and mid-infrared and atomic carbon and C2 in the visible. CO absorption of a single vibrational line is also measured with a tunable diode laser. The experimental data analyzed here are at a pressure of 0.25 Torr in the driven section and span a shock velocity range from 3.4-9.5 km/s. The emission and absorption signals are analyzed to extract temperature relaxation behind the shock which is used to derive the rate of CO dissociation. The emission spectra are compared to results using different kinetic parameters for CO dissociation and C2 dissociation and exchange. Different rates from the literature are found to match the data from 3.4-6.6 km/s and 6.6-9.5 km/s. Areas for improvement in CO and C2 radiation modeling are suggested on the basis of the analysis.