Application of the steady-state and unsteady-state lasers in reconstructing the geometrical characteristic parameters of soot fractal aggregates

He, Zhenzong; Dong, Chuanhui; Xu, Liang; Mao, Junkui; Tu, Zecan

doi:10.1016/j.ijleo.2019.163720

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…When a collimated light with intensity I 0 impinges on a particle system, the transmitted light is scattered and absorbed by the particles. If the aerosol is optically thin and the independent scattering dominates, the real-time angular light-scattering ( Figure 1) intensity I (θ, t) at the angle θ can be expressed as follows [33][34][35][36]:…”

Section: Angular Light-scattering (Als) Methodsmentioning

confidence: 99%

Application of Multistep Inversion Method for Online Monitoring Aerosol Particle Size Distribution and Aerosol Concentration

Mao

et al. 2020

Mathematical Problems in Engineering

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Aerosol concentration in the flow is usually time varying, and aerosol particle size distribution (PSD) is considered to be unchanged, which increases the difficulty of the measurement of aerosol PSD and concentration online. To solve these problems, a kind of multistep inversion method based on the angular light-scattering (ALS) signals is proposed. First, the aerosol PSD is estimated using shuffled frog-leaping algorithms (SFLAs) from relative ALS signals. Then, with aerosol PSD as priori information, the aerosol concentration is obtained by the Kalman filter (KF) algorithm, widely used in the real-time control system of industrial facilities for its ability of fast predictions. The result reveals that the performance of the improved SFLA is better than that of the original SFLA in solving the aerosol PSD. Moreover, in studying the aerosol concentration, more accurate results can be obtained with larger standard deviation of process noise or smaller standard deviation of measurement noise, while decreasing sampling time interval can improve the accuracy of retrieval results and reduce time delay to a certain degree. So, to improve retrieval accuracy, the noise should be controlled, and appropriate sampling time interval should be selected. All the numerical simulations confirm that the methodology provides effective and reliable results in real-time estimating.

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Section: Angular Light-scattering (Als) Methodsmentioning

confidence: 99%

Application of Multistep Inversion Method for Online Monitoring Aerosol Particle Size Distribution and Aerosol Concentration

Mao

et al. 2020

Mathematical Problems in Engineering

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“…1 that the geometrical characteristic parameters play an important role in describing the morphology and construction of the particle aggregate. The corresponding formulas are as follows [11]:…”

Section: The Direct Problem 21 the Fractal Aggregate Theorymentioning

confidence: 99%

“…(1) The relative deviation  is defined as the sum of the deviation between the probability distribution estimated from the inverse calculation and the actual distribution of g R in every subinterval, it follows the following equation: 11 , , , , or…”

Section: IImentioning

confidence: 99%

Determining of geometrical characteristic parameters of particle fractal aggregates from light scattering measurement signals

Mao

et al. 2021

THERM SCI

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Two kind of light scattering measurement methods, i.e. the forward light scattering measurement (FLSM) method and the angular light scattering measurement (ALSM) method, are applied to reconstruct the geometrical morphology of particle fractal aggregates. An improved Attractive and Repulsive Particle Swarm Optimization (IARPSO) algorithm is applied to reconstruct the geometrical structure of fractal aggregates. It has been confirmed to show better convergence properties than the original Particle Swarm Optimization (PSO) algorithm and the Attractive and Repulsive Particle Swarm Optimization (ARPSO) algorithm. Compared with the FLSM method, the ASLM method can obtain more accurate and robust results as the distribution of the fitness function value obtained by the ALSM method is more satisfactory. Meanwhile, the retrieval accuracy can be improved by increasing the number of measurement angles or the interval between adjacent measurement angles even when the random noises are added. All the conclusions have important guiding significance for the further study of the geometry reconstruction experiment of fractal aggregates.

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Experimental study of the effects of excess air ratio on combustion and emission characteristics of the hydrogen-fueled rotary engine

Meng

Yang

et al. 2021

International Journal of Hydrogen Energy

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Application of the steady-state and unsteady-state lasers in reconstructing the geometrical characteristic parameters of soot fractal aggregates

Cited by 4 publications

References 37 publications

Application of Multistep Inversion Method for Online Monitoring Aerosol Particle Size Distribution and Aerosol Concentration

Application of Multistep Inversion Method for Online Monitoring Aerosol Particle Size Distribution and Aerosol Concentration

Determining of geometrical characteristic parameters of particle fractal aggregates from light scattering measurement signals

Experimental study of the effects of excess air ratio on combustion and emission characteristics of the hydrogen-fueled rotary engine

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