Radiative Properties of Molecular Gases

Modest, Michael F.

doi:10.1016/b978-0-12-386944-9.50011-x

Cited by 4 publications

References 134 publications

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High spatial resolution laser cavity extinction and laser-induced incandescence in low-soot-producing flames

et al. 2015

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Accurate measurement techniques for in situ determination of soot are necessary to understand and monitor the process of soot particle production. One of these techniques is line-of-sight extinction, which is a fast, low-cost and quantitative method to investigate the soot volume fraction in flames. However, the extinction-based technique suffers from relatively high measurement uncertainty due to low signal-to-noise ratio, as the single-pass attenuation of the laser beam intensity is often insufficient. Multi-pass techniques can increase the sensitivity, but may suffer from low spatial resolution. To overcome this problem, we have developed a high spatial resolution laser cavity extinction technique to measure the soot volume fraction from low-soot-producing flames. A laser beam cavity is realised by placing two partially reflective concave mirrors on either side of the laminar diffusion flame under investigation. This configuration makes the beam convergent inside the cavity, allowing a spatial resolution within 200 μm, whilst increasing the absorption by an order of magnitude. Three different hydrocarbon fuels are tested: methane, propane and ethylene. The measurements of soot distribution across the flame show good agreement with results using laser-induced incandescence (LII) in the range from around 20 ppb to 15 ppm.

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High spatial resolution laser cavity extinction and laser-induced incandescence in low-soot-producing flames

et al. 2015

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Fouling in a Steam Cracker Convection Section Part 2: Coupled Tube Bank Simulation using an Improved Hybrid CFD-1D Model

Kulkarni

Verhees

Akhras

et al. 2019

Heat Transfer Engineering

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Improved Curtis-Godson approximation method for infrared optical radiation properties prediction of high-temperature combustion system

Bai

Huang

et al. 2022

Thirteenth International Conference on Information Optics and Photonics (CIOP 2022)

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The increasing significance of high-temperature gases in heat transfer, combustion, and rocket exhaust plume, restrictions motivate researchers to continuously seek more efficient and accurate models to explain the related physical phenomena. The traditional Curtis-Godson approximation (CGA) will lose accuracy in the presence of severely inhomogeneous participating combustion gases by ignoring the high sensitivity of the narrow-band halfwidth to gas temperature and pressure. In order to improve the accuracy of traditional CGA, this paper introduces a correction function to correct the narrow-band half-width along the line-of-sight direction of the combustion system, where the correction function is related to the thermodynamic state of the high-temperature gas. The infrared spectral transmissivities calculated by the line-by-line approach are used as the benchmark solution to evaluate the accuracy of our improved CGA. The results in this study can be used to efficiently calculate the radiative transfer of rocket exhaust plumes.

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Radiative Properties of Molecular Gases

Cited by 4 publications

References 134 publications

High spatial resolution laser cavity extinction and laser-induced incandescence in low-soot-producing flames

High spatial resolution laser cavity extinction and laser-induced incandescence in low-soot-producing flames

Fouling in a Steam Cracker Convection Section Part 2: Coupled Tube Bank Simulation using an Improved Hybrid CFD-1D Model

Improved Curtis-Godson approximation method for infrared optical radiation properties prediction of high-temperature combustion system

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