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Two-line thermometry and H_2O measurement for reactive mixtures in rapid compression machine near 7.6 μm

机译:在7.6μm附近的快速压缩机中对反应混合物进行两线测温和H_2O测量

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摘要

A much desired, direct, in situ, diagnostics technique is implemented to measure time variations of temperature and water concentration for a reactive mixture in a rapid compression machine (RCM) using quantum cascade laser absorption spectroscopy near 7.6 μm. The temperature measurements in the RCM are successfully conducted for an end of compression pressure of P_C~ 11.5 bar and an end of compression temperature of T_C~ 1022 K for H_2/O_2/Ar mixtures with (0.5% by mole in the reactive mixture) and without water doping. For all cases investigated, the molar percentages of H_2 and O_2 in the reactive mixture are respectively kept at 3% while the balance is Ar, in order to modulate the extent of post-ignition pressure rise. Absorption lines of water at 1316.55 cm~(-1) and 1316.97 cm~(-1) are used in this study for the measurements. A six-pass setup inside the RCM is implemented for the reactive experiments. For determining the line broadening parameters of water in the range of 1316.4-1317.8 cm~(-1) with H_2 or O_2 as a bath gas, a six-pass, 50.8 mm Herriott cell is used in the calibration experiments. The broadening parameters are measured in the pressure range of 300-650 Torr, while the Herriott cell is heated uniformly to temperatures of 460, 500, and 530 K, respectively. With the measured line broadening parameters of water in the bath gases of interest, the temperature and water concentration histories in the RCM runs are experimentally determined. In addition, the experimental results are compared with the simulations with detailed chemistry. Reasonable agreement is found, thereby demonstrating the utility of this mid-IR absorption spectroscopy in RCM experiments. The uncertainties of the associated measurements of temperature and water concentration are also discussed.
机译:在快速压缩机(RCM)中使用接近7.6μm的量子级联激光吸收光谱法,实现了一种非常需要的直接就地诊断技术,以测量反应混合物的温度和水浓度的时间变化。对于H_2 / O_2 / Ar混合物(反应混合物中为0.5摩尔%)的H_2 / O_2 / Ar混合物,成功地在RCM中进行了温度测量,压缩压力为P_C〜11.5 bar,压缩温度为T_C〜1022K。没有水掺杂。对于所研究的所有情况,反应混合物中H_2和O_2的摩尔百分比分别保持在3%,而其余部分为Ar,以调节点火后压力上升的程度。在本研究中,使用了1316.55 cm〜(-1)和1316.97 cm〜(-1)的水吸收线进行测量。 RCM内部的六遍设置可用于反应性实验。为了确定以H_2或O_2为浴气体的1316.4-1317.8 cm〜(-1)范围内的水的线展宽参数,在校准实验中使用了六通50.8 mm Herriott池。扩宽参数是在300-650托的压力范围内测量的,而Herriott电池则分别被均匀加热到460、500和530 K的温度。利用所测量的浴液中水的测得的线展宽参数,可以通过实验确定RCM运行中的温度和水浓度历史记录。此外,将实验结果与详细化学方法的模拟结果进行了比较。找到了合理的协议,从而证明了该中红外吸收光谱在RCM实验中的实用性。还讨论了温度和水浓度的相关测量的不确定性。

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