Investigation of droplet combustion in strained counterflow diffusion flames using planar laser-induced fluorescence

Mercier, Xavier; Orain, Mikaël; Grisch, Frédéric

doi:10.1007/s00340-007-2605-y

Cited by 23 publications

(7 citation statements)

References 27 publications

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“…The laser wavelength, 283.599 nm, was calibrated by wavemeter (WaveMaster, Coherent, CA, USA), corresponding to 283.553 nm; this was used to excite the Q 1 (8) line of the (0,1) band of the OH (X 2 Π − A 2 Σ + ) system. The OH transition was confirmed to give off a strong fluorescence signal relative to neighboring transitions, which was particularly suitable for this complex environment [20]. In the experiment, the observation windows were extremely vulnerable to oil contamination, which greatly increased the difficulty of excitation and detection.…”

Section: Experiments Detailsmentioning

confidence: 92%

“…The heavy oil boiler, an industrial-type burner, operates with an oil spray involving a two-phase combustion process. The physical processes such as spray atomisation and transport, turbulence, and chemistry interact with each other, which makes it hard to predict combustion state by numerical simulations [19,20]. The combustion characteristics of heavy oil under different conditions, including temperature and pollutant emission characteristics, have been investigated [17].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Flame Evolution in Heavy Oil Boiler Bench Using High-Speed Planar Laser-Induced Fluorescence Imaging

Peng

Cao

et al. 2018

Applied Sciences

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Over recent years, much attention has been paid to the performance evaluation of industrial-type burners. The ignition and stable combustion process are of great significance in assessing the quality of burner. The planar laser-induced fluorescence (PLIF) technique can be applied to heavy oil boilers, extending this technique to engineering applications. Considering the complex environment of the bench test, measures such as temperature control and moisture proofing are made to improve the possibility of detection using PLIF. In this paper, an experimental investigation of flame growth following ignition is reported. A wrinkled structure could be observed from the configuration of the ignition flame; its trajectory will be depicted. The results showed that the wrinkled structure developed downward, i.e., by deviation from the direction of the airflow. The displacement velocity of the flame was used to describe the combustion rate. Good agreement was obtained for the flame shapes of both forced ignition and autoignition. In addition, the center of combustion deviated from the center of boiler, possibly due to some irregularity in the burner’s assembly which was critical to the design of the combustion chamber.

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Section: Experiments Detailsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Investigation of Flame Evolution in Heavy Oil Boiler Bench Using High-Speed Planar Laser-Induced Fluorescence Imaging

Peng

Cao

et al. 2018

Applied Sciences

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“…Similarly, Shringi et al visualized the acetone concentration fields inside single droplets of both pure acetone and mixtures of acetone and either methanol or propanol [ 78 ]. Additionally, Mercier et al investigated acetone droplets using planar laser-induced fluorescence (PLIF) on hydroxyl radicals and acetone itself and thereby visualized the spatial distribution of the vapor and the structure of the flame around the droplet [ 79 ]. If there is no fluorescent molecule naturally present in the formulation, a fluorescent dye can be introduced.…”

Section: Physics Of Particle Formation From a Drying Dropletmentioning

confidence: 99%

Unraveling Particle Formation: From Single Droplet Drying to Spray Drying and Electrospraying

et al. 2020

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Spray drying and electrospraying are well-established drying processes that already have proven their value in the pharmaceutical field. However, there is currently still a lack of knowledge on the fundamentals of the particle formation process, thereby hampering fast and cost-effective particle engineering. To get a better understanding of how functional particles are formed with respect to process and formulation parameters, it is indispensable to offer a comprehensive overview of critical aspects of the droplet drying and particle formation process. This review therefore closely relates single droplet drying to pharmaceutical applications. Although excellent reviews exist of the different aspects, there is, to the best of our knowledge, no single review that describes all steps that one should consider when trying to engineer a certain type of particle morphology. The findings presented in this article have strengthened the predictive value of single droplet drying for pharmaceutical drying applications like spray drying and electrospraying. Continuous follow-up of the particle formation process in single droplet drying experiments hence allows optimization of manufacturing processes and particle engineering approaches and acceleration of process development.

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“…In this case, we perform simulations to study the combustion state of droplets and the distribution of flames in forced convection environments under different inflow velocities and compare the numerical results with the experimental results (Mercier et al , 2007).…”

Section: Numerical Simulationmentioning

confidence: 99%

A multiphase SPH framework for solving the evaporation and combustion process of droplets

Wang¹,

Hu²,

Shi³

2020

HFF

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Purpose This paper aims to introduce a two-dimensional smoothed particle hydrodynamics (SPH) framework for simulating the evaporation and combustion process of fuel droplets. Design/methodology/approach To solve the gas–liquid two-phase flow problem, a multiphase SPH method capable of handling high density-ratio problems is established. Based on the Fourier heat conduction equation and Fick’s law of diffusion, the SPH discrete equations are derived. To effectively characterize the phase transition problem, inspired by volume of fluid method, the concept of liquid phase mass fraction of the SPH particles is proposed. The one-step global reaction model of n-hexane is used for the vapor combustion. Findings The evaporation and combustion process of single droplet conforms to the law. The framework works out well when the evaporation of multiple droplets involves coalescence process. Three different kinds of flames are observed in succession in the combustion process of a single droplet at different inflow velocity, which agree well with the results of the experiment. Originality/value To the best of the authors’ knowledge, this is the first computational framework that has the capability to simulate evaporation and combustion with SPH method. Based on the particle nature of SPH method, the framework has natural advantages in interface tracking.

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Investigation of droplet combustion in strained counterflow diffusion flames using planar laser-induced fluorescence

Cited by 23 publications

References 27 publications

Investigation of Flame Evolution in Heavy Oil Boiler Bench Using High-Speed Planar Laser-Induced Fluorescence Imaging

Investigation of Flame Evolution in Heavy Oil Boiler Bench Using High-Speed Planar Laser-Induced Fluorescence Imaging

Unraveling Particle Formation: From Single Droplet Drying to Spray Drying and Electrospraying

A multiphase SPH framework for solving the evaporation and combustion process of droplets

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