Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Ghorashi, Seyed Amin; Hashemi, Seyed Mohammad; Mollamahdi, Mahdi

doi:10.1177/0954406219884979

Cited by 4 publications

(5 citation statements)

References 35 publications

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“…A conclusion that can be drawn from Figure 3b,c is that the smaller the pore size and interval, the lowe the heat transfer. The same conclusion is also reached in GS's experiments [17]. As shown in Figure 3a, the shape of the HRR curve varies substantially with the pore shape-the different pore shapes have different combustion performances, as expected.…”

Section: Combustion Performancesupporting

confidence: 83%

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Combustion Performance of Various Polylactic Acid Plastics with Different Porous Structures Constructed by 3D Printing

Yuan,

Wang

2023

Fire

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Polylactic acid (PLA) has intrigued widespread attention as a biodegradable and environmentally friendly polymer, and recent research has revealed that the use of porous PLA in heat sinks for thermal management materials offers promising development potential. However, the heat transfer performance is closely related to its structure theoretically, whether it is virgin, and how the pore structure affects its heat transfer. Therefore, a novel approach is proposed to address this issue by preparing porous PLA through 3D printing at low complexity and cost, the combustion performance is employed to evaluate the heat transfer indirectly, and the higher burning speed represents higher efficient heat transfer. A new framework is developed to investigate combustion performance and three series of PLA with different pore structures in pore shape, size, and interval are studied by combining experimental tests, respectively. It demonstrates that adjusting the pore structure of PLA significantly alters its combustion performance, evidenced by significant variations in flame growth index, which are 83% better for the 2 mm holes than the largest holes and 71% better for the 2 mm interval than for the sparsest pore structure. Generally, it provides some experimental basis for designing porous thermal management materials; the various pore structures generate different combustion performances, corresponding to various heat transfer.

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Section: Combustion Performancesupporting

confidence: 83%

“…A conclusion that can be drawn from Figure 3b,c is that the smaller the pore size and interval, the lower the heat transfer. The same conclusion is also reached in GS's experiments [17].…”

Section: Smoke Production Rate and Temperaturesupporting

confidence: 82%

Combustion Performance of Various Polylactic Acid Plastics with Different Porous Structures Constructed by 3D Printing

Yuan,

Wang

2023

Fire

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“…In addition, as the swirl number of the third premixed stage increases from 0.6 to 1.2, the emissions of NO and CO decrease by 28.7% and 75%, respectively. Ghorashi et al, 12 investigated the combustion process implements by a numerical simulation in a porous-free flame burner. They found by decreasing the pore density of porous medium, the flame stability is extended.…”

Section: Literature Reviewmentioning

confidence: 99%

Optimum swirl angle of natural gas combustion in domestic cooker burner with various output port

Deymi–Dashtebayaz

Rezapour

Afshoun³

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Due to the wide spread use of household cooker burner, optimal design of these equipment can significantly reduce the natural gas consumption which consequently leads to energy consumption reduction, emissions reduction, and economic benefits. Shape of cooker-top and swirl angle are the most important effective factors on performance of domestic cooker burner. This paper investigates the impact of swirling the output port on performance of the burner, numerically. In this regard, four types of burners are three-dimensionally modeled and compared to determine the optimal port swirl angle based on burner temperature, heat transfer rate and pollutant emissions. Results show that the optimum swirl angle for output port is 20º where the maximum combustion temperature and desired heat transfer and pollutant emissions are obtained. The maximum burner head temperature for non-swirled burner is equal to 1610 K while for swirl angle of 20º, in addition to pollutant emissions reduction, the maximum burner head temperature of 1673 K is obtained. It is also concluded that the turbulence dissipation of flow increases by swirling the cooker-top burner.

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“…[17][18][19] Several studies on the PMC indicated the advantages of using this technology in enhancing combustion performance, reducing the pollutant emission and working at high power densities. [20][21][22][23] Pollutant emissions and combustion performance of premixed ammoniahydrogen-air flame through a porous media block were evaluated experimentally by Nozari et al 24 They examined the burner efficiency and NO x emission at high ammonia concentrations over a wide range of equivalence ratios. Results indicated that the minimum NO x emission was measured at rich fuel conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the pollutant emissions of premixed ammonia/methane/air flame within porous burner

Hashemi,

Wang,

Mao

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present study, premixed ammonia-methane combustion within a two-layer porous burner was investigated experimentally in order to evaluate the pollutant emissions. The effects of alumina spheres diameter, equivalence ratio and ammonia fraction on the flame stability limits, CO and NO pollutant emissions were considered. The tests were performed for equivalence ratios from 0.8 to 1, ammonia fraction from 20% to 80% and a range of alumina spheres diameters from 5 to 40 mm. Measurements illustrated that increasing the equivalence ratio improved the flame stability limits regardless of ammonia fraction while flame stability limits decreased with increasing the ammonia fraction. Results indicated that for the mixtures with ammonia content less than 50%, increasing ammonia fraction caused increase in NO emission regardless to the equivalence ratio, while for mixtures with ammonia fractions higher than 50%, the NO emission decreased slightly as ammonia content increased. Meanwhile, with increasing the ammonia fraction, CO concentration decreased at examined equivalence ratios. It was found that increasing equivalence ratio increased the NO emission, while CO concentration decreased as equivalence ratio increased. Measurements proved that decreasing the diameter of alumina spheres caused decrease of NO and CO quantities regardless to equivalence ratio.

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Numerical study on the combustion characteristics in a porous-free flame burner for lean mixtures

Cited by 4 publications

References 35 publications

Combustion Performance of Various Polylactic Acid Plastics with Different Porous Structures Constructed by 3D Printing

Combustion Performance of Various Polylactic Acid Plastics with Different Porous Structures Constructed by 3D Printing

Optimum swirl angle of natural gas combustion in domestic cooker burner with various output port

Experimental study on the pollutant emissions of premixed ammonia/methane/air flame within porous burner

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