Simulation on simultaneous estimation of non-uniform temperature and soot volume fraction distributions in axisymmetric sooting flames

Ai, Yuhua; Zhou, Huaichun

doi:10.1016/j.jqsrt.2004.05.048

Cited by 13 publications

(6 citation statements)

References 12 publications

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“…Especially, in some special cases such as zero gravity or microgravity experiments [52] and large-scale combustion chambers, optical diagnostics based on laser are not suitable while emission CT is rather simple to implement. Many researches have carried out experiments for a long time [23,24,[52][53][54][55][56][57][58][59][60][61][62].…”

Section: Emission Computed Tomographymentioning

confidence: 99%

“…Ai et al [24,59] detected flame radiative intensities in wavelengths of red, green, and blue, and then proposed an emission method, in which a simultaneous estimating procedure was carried out from the spectral radiative intensities by using a Newton-type iteration algorithm and the leastsquares method. Liu et al [60] used the conjugate gradient method and the 1-D search method to estimate the temperature profile and the absorption coefficient in an absorbing, emitting, non-scattering, and gray semitransparent parallel plane.…”

Section: Emission Computed Tomographymentioning

confidence: 99%

“…In refs. [24,[59][60][61][62], the scattering of flames were neglected. However, soot scattering measurements in visible spectrum showed that scattering to extinction ratio for ethylene-air flame was about 20% [70].…”

Section: Emission Computed Tomographymentioning

confidence: 99%

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Review of soot measurement in hydrocarbon-air flames

Lou

Chen

Sun

et al. 2010

Sci. China Technol. Sci.

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Soot, which is produced in fuel-rich parts of flames as a result of incomplete combustion of hydrocarbons, is the No. 2 contributor to global warming after carbon dioxide. Developing soot measurement techniques is important to understand soot formation mechanism and control soot emission. The various soot measurement techniques, such as thermophoretic sampling particles diagnostics followed by electron microscopy analysis, thermocouple particle densitometry, light extinction, laser-induced incandescence, two-color method, and emission computed tomography, are reviewed in this paper. The measurement principle and application cases of these measurement methods are described in detail. The development trend of soot measurement is to realize the on-line measurement of multi-dimensional distributions of temperature, soot volume fraction, soot particle size and other parameters in hydrocarbon-air flames. Soot measurement techniques suitable for both small flames in laboratories and large-scale flames in industrial combustion devices should be developed. Besides, in some special situations, such as high-pressure, zero gravity and micro-gravity flames, soot measurement also should be provided. hydrocarbon-air flames, combustion measurement, soot, laser-induced incandescence, emission CT Citation:Lou C, Chen C, Sun Y P, et al. Review of soot measurement in hydrocarbon-air flames.

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Section: Emission Computed Tomographymentioning

confidence: 99%

Section: Emission Computed Tomographymentioning

confidence: 99%

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Review of soot measurement in hydrocarbon-air flames

Lou

Chen

Sun

et al. 2010

Sci. China Technol. Sci.

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“…针对非光学薄火焰对象, 艾育华等 [24,59] 检测到的火焰在红、绿、蓝三波长下的辐射强度, 利用牛顿迭代算法同时重建了轴对称温度与碳黑体积份额分布; 刘林华等 [60] 2) 已证明碳黑折射率函数、热有效系数等对 LII 模型影响较大 [63] , 在实际应用中, 该如何确定这些系数. 另外, 还需要一些实验对 LII 模型进行验证.…”

Section: 发射 Ct 法unclassified

碳氢火焰中碳黑检测方法评述

娄¹,

陈²,

周³

et al. 2010

Sci. Sin.-Tech.

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“…Das et al [ 12 ] investigated the influence of the addition of macromolecular hydrocarbons on combustion by inversing the temperature and soot volume fraction with the Gaussian basis set expansion Abel transform method. Ai et al [ 13 ] presented a reconstruction model for axisymmetric flames in combination with the three-color emission method to retrieve the temperature and soot volume fraction of both single-peaked flame and double-peaked flame, and the numerical results reflected the superiority compared with the traditional two-color thermometry. Subsequently, the reconstruction model was optimized by Yan et al [ 14 , 15 , 16 ] to reconstruct the temperature and soot loading of an ethylene diffusion flame under different combustion conditions considering the spectral response efficiency of the CCD camera.…”

Section: Introductionmentioning

confidence: 99%

Edge Effects on Simultaneous Reconstructions of Flame Temperature and Soot Volume Fraction Profiles by a CCD Camera

Chen

et al. 2022

Sensors

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In this paper, the influence of the edge effect on the simultaneous reconstruction of axisymmetric flame temperature and soot volume fraction profiles by a single CCD camera was investigated in detail. The reconstruction accuracy of the flame temperature profile and soot volume fraction was insensitive to the measurement error of the coefficient matrix. When the signal to ratio (SNR) of the measurement system for both the radiation intensity and coefficient matrix was as low as 46 dB, the reconstruction accuracy for both temperature and soot volume fraction was acceptable and was more influenced by the radiation intensity measurement error. The reconstruction of the flame temperature and soot volume fraction was greatly influenced by the edge effect. When the flame edge with weak radiation signals was ignored during the reconstruction, the relative reconstruction error for the temperature and soot volume fraction increased from the flame center to the edge, and reached an unacceptable value at the reconstruction boundary, especially for the soot volume fraction. The flame image boundary could be chosen as the unified reconstruction boundary to reconstruct the two-dimensional distribution of the temperature and soot volume fraction with satisfactory accuracy. The low soot volume fraction could influence the reconstruction accuracy for both the temperature and soot concentration in non-sooting regions. Moreover, there was no obvious regularity between the reconstruction accuracy of the temperature and soot volume fraction and the extension of the reconstruction boundary.

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Simulation on simultaneous estimation of non-uniform temperature and soot volume fraction distributions in axisymmetric sooting flames

Cited by 13 publications

References 12 publications

Review of soot measurement in hydrocarbon-air flames

Review of soot measurement in hydrocarbon-air flames

碳氢火焰中碳黑检测方法评述

Edge Effects on Simultaneous Reconstructions of Flame Temperature and Soot Volume Fraction Profiles by a CCD Camera

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