Measurements of multiple gas parameters in a pulsed-detonation combustor using time-division-multiplexed Fourier-domain mode-locked lasers
Measurements of multiple gas parameters in a pulsed-detonation combustor using time-division-multiplexed Fourier-domain mode-locked lasers
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DOI：
10.1364/ao.52.002893
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发表时间：
2013-04-20
期刊：
影响因子：
1.9
通讯作者：
Gord, James R.
中科院分区：
文献类型：
--
作者：
Caswell, Andrew W.;Roy, Sukesh;Gord, James R.
在美国空军研究实验室，高光谱吸收光谱被用于监测研究级脉冲爆燃燃烧室（PDC）中的气体温度、速度、压力和H2O摩尔分数。所采用的高光谱源被称为TDM 3-FDML，因为它由三个时分多路（TDM）傅立叶域锁模（FDML）激光器组成。这种基于光纤的光源可以在1350 nm附近的H2O吸收光谱中监测足够的光谱信息，从而可以在整个PDC循环过程中遇到的各种条件下进行测量。基于吸收特征的多普勒测速采用了一种旨在最小化共模流噪声的反传播波束方法。在这项研究中，PDC有两种配置：一种是燃烧管直接排放到环境中，另一种是为汽车式涡轮增压器提供燃料，以评估爆震驱动涡轮的性能。由于焓流[千焦耳/秒]对于评估PDC在各种配置下的性能非常重要，因此它是根据测量的气体性质计算的。(C) 2013年美国光学学会
Hyperspectral absorption spectroscopy is being used to monitor gas temperature, velocity, pressure, and H2O mole fraction in a research-grade pulsed-detonation combustor (PDC) at the Air Force Research Laboratory. The hyperspectral source employed is termed the TDM 3-FDML because it consists of three time-division-multiplexed (TDM) Fourier-domain mode-locked (FDML) lasers. This optical-fiber-based source monitors sufficient spectral information in the H2O absorption spectrum near 1350 nm to permit measurements over the wide range of conditions encountered throughout the PDC cycle. Doppler velocimetry based on absorption features is accomplished using a counterpropagating beam approach that is designed to minimize common-mode flow noise. The PDC in this study is operated in two configurations: one in which the combustion tube exhausts directly to the ambient environment and another in which it feeds an automotive-style turbocharger to assess the performance of a detonation-driven turbine. Because the enthalpy flow [kilojoule/second] is important in assessing the performance of the PDC in various configurations, it is calculated from the measured gas properties. (C) 2013 Optical Society of America