Simultaneous sensing of temperature, CO, and CO2 in a scramjet combustor using quantum cascade laser absorption spectroscopy
Simultaneous sensing of temperature, CO, and CO2 in a scramjet combustor using quantum cascade laser absorption spectroscopy
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DOI：
10.1007/s00340-014-5884-0
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发表时间：
2014-11-01
影响因子：
2.1
通讯作者：
Hanson, R. K.
中科院分区：
文献类型：
--
作者：
Spearrin, R. M.;Goldenstein, C. S.;Hanson, R. K.
研制了一种中红外激光吸收传感器，用于测量高焓碳氢化合物燃烧流中的气体温度和一氧化碳（CO、CO2）浓度。这种诊断能够在高超音速推进地面试验设施产生的恶劣环境中进行非侵入式原位测量。该传感系统利用可调谐量子级联激光器能够探测的基本中红外吸收带的CO和CO2在4-5 μ m的波长域。扫描波长直接吸收技术采用两个激光器，一个专用于每个物种，自由空间光纤耦合使用分叉空芯光纤远程光传输的单一视线。扫描波长调制光谱与二次谐波检测被用来扩展CO测量的动态范围。诊断现场测试的直接连接的超燃冲压发动机燃烧室的乙烯-空气燃烧。同时对一氧化碳和二氧化碳进行基于激光的测量，为评估实际碳氢燃料发动机中具有时间和空间分辨率的燃烧完成或效率提供了基础。
A mid-infrared laser absorption sensor was developed for gas temperature and carbon oxide (CO, CO2) concentrations in high-enthalpy, hydrocarbon combustion flows. This diagnostic enables non-intrusive, in situ measurements in harsh environments produced by hypersonic propulsion ground test facilities. The sensing system utilizes tunable quantum cascade lasers capable of probing the fundamental mid-infrared absorption bands of CO and CO2 in the 4-5 A mu m wavelength domain. A scanned-wavelength direct absorption technique was employed with two lasers, one dedicated to each species, free-space fiber-coupled using a bifurcated hollow-core fiber for remote light delivery on a single line of sight. Scanned-wavelength modulation spectroscopy with second-harmonic detection was utilized to extend the dynamic range of the CO measurement. The diagnostic was field-tested on a direct-connect scramjet combustor for ethylene-air combustion. Simultaneous, laser-based measurements of carbon monoxide and carbon dioxide provide a basis for evaluating combustion completion or efficiency with temporal and spatial resolution in practical hydrocarbon-fueled engines.