Development of compact-modulated absorption/emission technique towards micro-gravity sooting flame measurements

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-04-12 DOI:10.1016/j.expthermflusci.2024.111212
Qianlong Wang , Zhen Li , Xiaoqing You , Haifeng Liu , Mingfa Yao , Yi Wu
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Abstract

To meet the experimental physical limitations on Chinese Space Station (CSS), three compact-modulated absorption/emission (CMAE) implementations are miniaturized progressively from original MAE layout, which are investigated as potential options for simultaneous soot temperature and volume fraction measurements in the axis-symmetric flames. Contrasted with the original MAE technique, a white LED point light source (diameter of ϕ = 8 mm) and a white LED planar light source (rectangle of 200 × 120 mm2) in turns replaces the laser source, by which the light beam homogeneous implementation is significantly simplified. Moreover, a 3-CMOS prism-based camera enables simultaneously recording flame two color radiations that reduces the detecting complexity. It is found that backlight beam intensity should be more than 2.5 times the flame radiation intensity to avoid abnormal extinction coefficient on the flame edge in this configuration. Moreover, the robustness and consistency of the three CMAEs measurements are validated with a standard Santoro’s flame, and low average standard deviation ranges of ±0.04 ±0.06 ppm and ±65.0 ± 96.3 K for soot volume fraction and temperature respectively is evaluated from error propagation assessment. As such, the proposed CMAE-2 and CMAE-3 layouts are promising candidates for high-fidelity flame soot parameters measurements under limited space, weight and power supply on CSS.

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开发用于微重力烟尘火焰测量的紧凑型调制吸收/发射技术
为了满足中国空间站(CSS)上的实验物理限制,在原始 MAE 布局的基础上逐步实现了三种紧凑型调制吸收/发射(CMAE)装置的小型化,并将其作为轴对称火焰中同时测量烟尘温度和体积分数的潜在方案进行了研究。与原始 MAE 技术相比,白光 LED 点光源(直径 ϕ = 8 毫米)和白光 LED 平面光源(200 × 120 平方毫米的矩形)轮流取代了激光光源,从而大大简化了光束均匀性的实现。此外,基于 3-CMOS 棱镜的摄像头可同时记录两种颜色的火焰辐射,从而降低了检测的复杂性。研究发现,背光光束强度应大于火焰辐射强度的 2.5 倍,以避免在这种配置下火焰边缘出现异常消光系数。此外,用标准桑托罗火焰验证了三种 CMAE 测量方法的稳健性和一致性,并通过误差传播评估得出烟尘体积分数和温度的平均标准偏差范围分别为 ±0.04 ∼ ±0.06 ppm 和 ±65.0 ∼ ± 96.3 K。因此,拟议的 CMAE-2 和 CMAE-3 布局有望在 CSS 上有限的空间、重量和电源条件下实现高保真火焰烟尘参数测量。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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