| Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows | |
Li F(李飞) ; Yu XL(余西龙); Cai WW; Ma L; Ma, L; Virginia Tech, Dept Aerosp & Ocean Engn, Blacksburg, VA 24061 USA.
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| Source Publication | APPLIED OPTICS
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| 2012-07-10 | |
| Volume | 51Issue:20Pages:4788-4797 |
| ISSN | 1559-128X |
| Abstract | This work investigates the error caused by nonuniformities along the line-of-sight in velocity measurement using tunable diode-laser absorption spectroscopy (TDLAS). Past work has demonstrated TDLAS as an attractive diagnostic technique for measuring velocity, which is inferred from the Doppler shift of two absorption features using two crossing laser beams. However, because TDLAS is line-of-sight in nature, the obtained velocity is a spatially averaged value along the probing laser beams. As a result, nonuniformities in the flow can cause uncertainty in the velocity measurement. Therefore, it is the goal of this work to quantify the uncertainty caused by various nonuniformities typically encountered in practice, including boundary layer effects, the divergence/convergence of the flow, and the methods used to fit the Doppler shift. Systematic analyses are performed to quantify the uncertainty under various conditions, and case studies are reported to illustrate the usefulness of such analysis in interpreting experimental data obtained from a scramjet facility. We expect this work to be valuable for the design and optimization of TDLAS-based velocimetry, and also for the quantitative interpretation of the measurements. |
| Keyword | Wavelength-modulation Spectroscopy Water-vapor Temperature Distributions Scramjet Combustor Gas Temperature Parameters Pressure Sensors |
| Subject Area | 实验流体力学 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000306291100028 |
| Department | LHD高温气流激光诊断 |
| Classification | 二类 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/46552 |
| Collection | 高温气体动力学国家重点实验室 |
| Corresponding Author | Ma, L; Virginia Tech, Dept Aerosp & Ocean Engn, Blacksburg, VA 24061 USA. |
| Recommended Citation GB/T 7714 | Li F,Yu XL,Cai WW,et al. Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows[J]. APPLIED OPTICS,2012,51,20,:4788-4797. |
| APA | Li F,Yu XL,Cai WW,Ma L,Ma, L,&Virginia Tech, Dept Aerosp & Ocean Engn, Blacksburg, VA 24061 USA..(2012).Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows.APPLIED OPTICS,51(20),4788-4797. |
| MLA | Li F,et al."Uncertainty in velocity measurement based on diode-laser absorption in nonuniform flows".APPLIED OPTICS 51.20(2012):4788-4797. |
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