Liquid-phase dynamics during the two-droplet combustion of diesel-based fuel mixtures

Faik, Ahmad Muneer El-Deen; Yang, Zhigang

doi:10.1016/j.expthermflusci.2020.110084

Cited by 12 publications

(8 citation statements)

References 56 publications

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“…In accordance with previous conclusions, the maximum ignitable normalised spacing distance It is worth noting that when L/D 0 = 2.5 and P = 1 bar, the droplet interaction coefficient was larger than 1, indicating that the two-droplet burning rate was more rapid than that of the isolated droplet. The explanation for this observation is twofold: on the one hand the oxygen competition effect had less effect on the burning rate of the droplets at atmospheric pressure, and on the other hand, the area of the downstream sooty flame had increased in the two-droplet burning compared to the single-droplet case, thus increasing the heat transfer to the droplet surface due to radiation and convection, which in turn raised the burning rate of the droplets [19]. As the normalised spacing distance of the droplets was further increased, the droplets were wrapped in two separate flames at 1 bar, so the burning of the binary droplets became similar to that of a single droplet, and the droplet interaction coefficient approached one.…”

Section: Effects Of Puffing and Microexplosionmentioning

confidence: 98%

“…Xiong et al [18] claimed that interactions between droplets slowed down the droplet heating time early in the burning life due to the oxygen competition, leading to a reduction in burning rate. Faik et al [19] studied the combustion characteristics of two diesel-based fuel droplets and found that the burning rate of interactive droplets was higher than that of an isolated droplet, owing to the increased heat transfer rate from the sooty flame. Yoschida et al [20] conducted experiments with droplets placed at SiC fibre intersections under microgravity in order to study the flame spread limit for interactive burning droplets.…”

Section: Introductionmentioning

confidence: 99%

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Interactive Effects in Two-Droplets Combustion of RP-3 Kerosene under Sub-Atmospheric Pressure

Zhang

Wang

et al. 2021

Processes

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To improve our understanding of the interactive effects in combustion of binary multicomponent fuel droplets at sub-atmospheric pressure, combustion experiments were conducted on two fibre-supported RP-3 kerosene droplets at pressures from 0.2 to 1.0 bar. The burning life of the interactive droplets was recorded by a high-speed camera and a mirrorless camera. The results showed that the flame propagation time from burning droplet to unburned droplet was proportional to the normalised spacing distance between droplets and the ambient pressure. Meanwhile, the maximum normalised spacing distance from which the left droplet can be ignited has been investigated under different ambient pressure. The burning rate was evaluated and found to have the same trend as the single droplet combustion, which decreased with the reduction in the pressure. For every experiment, the interactive coefficient was less than one owing to the oxygen competition, except for the experiment at L/D0 = 2.5 and P = 1.0 bar. During the interactive combustion, puffing and microexplosion were found to have a significant impact on secondary atomization, ignition and extinction.

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Section: Effects Of Puffing and Microexplosionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Interactive Effects in Two-Droplets Combustion of RP-3 Kerosene under Sub-Atmospheric Pressure

Zhang

Wang

et al. 2021

Processes

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“…Pembakaran droplet tunggal akan merepresentasikan droplet yang terbentuk pada pembakaran spray. Pada beberapa penelitian terdahulu, uji pembakaran droplet banyak dilakukan pada minyak nabati dan biodiesel yang terdiri atas senyawa multikomponen [18][19][20][21][22]. Pada penelitian tersebut, fenomena-fenomena yang diamati selama pembakaran droplet dikaitkan dengan konsentrasi senyawa yang paling dominan dalam bahan bakar.…”

Section: Pendahuluanunclassified

Pengaruh Panjang Rantai Karbon dan Derajat Ketidakjenuhan terhadap Karakteristik Pembakaran Droplet Asam Lemak Tunggal

Ibadurrohman

Hamidi

Yuliati

2021

JRM

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This study aimed to investigate the effect of the different carbon chain lengths and the degree of unsaturation of six fatty acids as the constituent of vegetable oils. The droplet combustion was carried out at an ambient temperature and atmospheric pressure. The variation in the carbon chain length and the degree of unsaturation resulted in different physical and chemical properties of the fuel, which affect the droplet combustion characteristics. The increase of the carbon chain length results in longer ignition delay times and shorter burning durations, as well as higher droplet temperatures, burning rate constant, and specific power output. Conversely, an increase in the degree of unsaturation with the presence of double bond results in shorter ignition delay and longer burning duration, as well as higher droplet temperatures, but lower burning rate constant and specific power output. The droplet diameter evolution divides the combustion period into unsteady burning zones and quasi-linear burning zones. The flame dimension of unsaturated fatty acid is higher due to the soot formation at the top of the flame. A bluish flame related to the higher oxygen content in the molecule can be observed in saturated fatty acids. The short-chain saturated fatty acid has a large non-luminous zone because they are rich in oxygen. In contrast, the long-chain saturated fatty acid has a narrow non-luminous zone with high flame radiation.

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“…The thermal atomization mechanism of droplet disintegration is based on the difference between the thermophysical properties of droplet components. This type of atomization can manifest itself when heating inhomogeneous droplets by puffing [30][31][32] or microexplosion [33][34][35][36][37]. Additionally, there are known technologies for the artificial carbonation of liquid fuels in order to use gas bubbles (for example, CO 2 ) as micro-explosion centers [38].…”

Section: Clf Atomization In the Combustion Chambers Of Power Plantsmentioning

confidence: 99%

Spraying of Composite Liquid Fuels Based on Types of Coal Preparation Waste: Current Problems and Achievements: Review

2021

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This article discusses the atomization of composite liquid fuels. A large group of injectors is considered. A comparative analysis of the atomization characteristics (droplet sizes and velocities, jet opening angles) and the influence of the fuel characteristics (density, viscosity, component composition) and the process parameters (the ratio of the fuel–air mass flow rates, the features of the jet formation) has been carried out. Finally, the most effective types of injectors, which provide for the necessary characteristics of fuel atomization for its combustion, have been determined. The most favorable conditions for the applicability of each type of atomization have been formulated. Possible mechanisms of secondary fragmentation of droplets of composite fuels have been analyzed: those resulting from mutual collisions of droplets in the flux and from the interaction with a solid surface as well as those resulting from thermal overheating in the presence of a phase boundary or a large gradient of component volatility. A conclusion is made about the need of using a synergistic effect of primary and secondary atomization of fuel suspension droplets.

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Liquid-phase dynamics during the two-droplet combustion of diesel-based fuel mixtures

Cited by 12 publications

References 56 publications

Interactive Effects in Two-Droplets Combustion of RP-3 Kerosene under Sub-Atmospheric Pressure

Interactive Effects in Two-Droplets Combustion of RP-3 Kerosene under Sub-Atmospheric Pressure

Pengaruh Panjang Rantai Karbon dan Derajat Ketidakjenuhan terhadap Karakteristik Pembakaran Droplet Asam Lemak Tunggal

Spraying of Composite Liquid Fuels Based on Types of Coal Preparation Waste: Current Problems and Achievements: Review

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