Numerically resolved line by line radiation spectrum of large kerosene pool fires

Bordbar, Hadi; Hostikka, Simo; Boulet, Pascal; Parent, Gilles

doi:10.1016/j.jqsrt.2020.107229

Cited by 10 publications

(4 citation statements)

References 34 publications

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“…For instance, the refractive index was found to be m = 1.66 + i0.76 for OC/EC = 0 (uncoated soot) and m = 1.6219 + i0.61 for OC/EC = 0.1 (thinly coated soot). These values of refractive index are close to the one reported by Chang and Charalampopoulos 86 , which has been used in several works for modeling and predicting radiative properties of black carbon from kerosene flame and pool fires [87][88][89] . Thus, the differential backscattering cross-section and lidar ratio used for the retrieval of n o and m o are dC bac = 6.4 ± 1.5 × 10 −4 µm 2 sr −1 and LR = 131.1 ± 18.6 sr , respectively.…”

Section: Methodssupporting

confidence: 84%

Black carbon aerosol number and mass concentration measurements by picosecond short-range elastic backscatter lidar

Ceolato

Bedoya-Velásquez

Fossard

et al. 2022

Sci Rep

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Black carbon aerosol emissions are recognized as contributors to global warming and air pollution. There remains, however, a lack of techniques to remotely measure black carbon aerosol particles with high range and time resolution. This article presents a direct and contact-free remote technique to estimate the black carbon aerosol number and mass concentration at a few meters from the emission source. This is done using the Colibri instrument based on a novel technique, referred to here as Picosecond Short-Range Elastic Backscatter Lidar (PSR-EBL). To address the complexity of retrieving lidar products at short measurement ranges, we apply a forward inversion method featuring radiometric lidar calibration. Our method is based on an extension of a well-established light-scattering model, the Rayleigh–Debye–Gans for Fractal-Aggregates (RDG-FA) theory, which computes an analytical expression of lidar parameters. These parameters are the backscattering cross-sections and the lidar ratio for black carbon fractal aggregates. Using a small-scale Jet A-1 kerosene pool fire, we demonstrate the ability of the technique to quantify the aerosol number and mass concentration with centimetre range-resolution and millisecond time-resolution.

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Section: Methodssupporting

confidence: 84%

Black carbon aerosol number and mass concentration measurements by picosecond short-range elastic backscatter lidar

Ceolato

Bedoya-Velásquez

Fossard

et al. 2022

Sci Rep

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“…Основные показатели спектра при обработке были: 1) тип спектра был амплитудный; 2) число значений спектра во время быстрого преобразования Фурье было 1048576; 3) тип весовой функции был треугольным. Спектральный анализ гармонических функций скорости и давления потоков является классическим подходом для изучения характеристик потока при различных граничных условиях [28,29].…”

Section: материалы и методыunclassified

Spectral analysis of gas dynamic processes in the inlet system of a piston engine with turbocharger

Plotnikov

Brodov

Жилкин

et al. 2021

«Izvestiya vysshikh uchebnykh zavedenii. PROBLEMY ENERGETIKI»

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THE PURPOSE. To carry out a comparative analysis of the spectra of gas-dynamic characteristics of flows in the intake systems of piston engines with and without turbocharging, to assess the degree of influence of the turbocharger on the flow structure in such systems, and also to propose a method for the gas-dynamic improvement of processes in the system under consideration. METHODS. Due to the complexity of the object of research, an experimental approach was taken as a basis. The experiments were carried out on a single-cylinder piston engine model, which could be equipped with a turbocharger. A system for collecting and processing experimental data based on an analog-to-digital converter was used in the study. Data on changes in local values of velocity and static pressure of pulsating flows in the intake system during the engine's operating cycle were obtained using a constant temperature hot-wire anemometer and a fast-acting pressure sensor. Spectral analysis of functions of flow velocity and pressure versus time was carried out on the basis of the fast Fourier transform algorithm.RESULTS. The article presents a comparative analysis of the spectra of the amplitudes of the velocity and pressure pulsations in the intake system of an engine with and without turbocharging. Also proposed is a method for stabilizing the pulsating flow in the intake system by installing a leveling grid in the outlet channel of the turbocharger compressor. CONCLUSION. It is shown that the installation of a turbocharger leads to a significant change in the structure of gas flows in the intake system of the engine. It has been established that the presence of a leveling grid in the intake system of a turbocharged piston engine leads to a decrease in the low-frequency amplitudes of the flow velocity and pressure pulsations up to 30%. It is shown that the probability of failure-free operation of an automobile engine (cylinder diameter – 82 mm, piston stroke – 71 mm) increases by almost 1% when a leveling grille is used in the intake system.

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“…The spectral nature of thermal radiation is commonly taken into account in gas phase simulations [14,15], and various models have been presented, such as weighted sum of gray gases (WSGG) [16,17], spectral line based weighted sum of gray gases (SLW) [18,19], and full spectrum correlated-k distribution (FSCK) [20,21]. In case of condensed-phase pyrolysis, the spectral modeling has only been reported in [22][23][24] in which spectral radiative transfer was modeled to extract the preignition temperature profile within the sample [25,26].…”

Section: Introductionmentioning

confidence: 99%

On the importance and modeling of in-depth spectral radiation absorption in the pyrolysis of black PMMA

Alinejad

Bordbar

Hostikka

2023

Fire Safety Journal

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Numerically resolved line by line radiation spectrum of large kerosene pool fires

Cited by 10 publications

References 34 publications

Black carbon aerosol number and mass concentration measurements by picosecond short-range elastic backscatter lidar

Black carbon aerosol number and mass concentration measurements by picosecond short-range elastic backscatter lidar

Spectral analysis of gas dynamic processes in the inlet system of a piston engine with turbocharger

On the importance and modeling of in-depth spectral radiation absorption in the pyrolysis of black PMMA

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