Experimental and numerical study of premixed propane/air combustion in the micro-planar combustor with a cross-plate insert

Tang, Aikun; Deng, Jiang; Xu, Yiming; Pan, Jianfeng; Cai, Tao

doi:10.1016/j.applthermaleng.2018.03.001

Cited by 35 publications

(7 citation statements)

References 36 publications

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“…Wenming et al 13 found that the introduction of a block insert increases the temperature level and uniformity of distribution. Tang et al 14 illustrated the advantages of utilizing a cross-plate in enhancing the blow-off limit and temperature level. Meanwhile, Wan et al 15 found that the introduction of a central rod expanded the blow-off limits.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of H2/Air fueled micro combustion characteristics with trapezoidal ribs for micro thermophotovoltaic applications: Effect of rib height

Lachraf,

Si Ameur

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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In this numerical study, the impact of equidistant trapezoidal ribs on the characteristics of premixed H2-air micro-combustion was investigated, with a specific focus on the rib height. The study comprehensively examined flame structure, flame front position, flame speed, and combustion efficiency. A comparative analysis was performed between a backward-facing step micro combustor (MCSD) and micro combustors with varying rib heights: MCRD1 (0.5 mm), MCRD2 (0.6 mm), and MCRD3 (0.7 mm). The incorporation of trapezoidal ribs resulted in the creation of elongated and evenly distributed recirculation zones, significantly enhancing mixing and promoting flame stability, particularly at higher rib heights. The recirculation zones played a critical role in influencing the chemical reaction rate and the species distribution, leading to higher flame speed and greater combustion intensity. The findings highlight the outcomes of incorporating ribs in terms of combustion efficiency. The combustion efficiency values for MCRD1, MCRD2, and MCRD3 were recorded as 96.95%, 96.75%, and 96.61%, respectively, while the MCSD had a combustion efficiency of 97.14%. Hence, the recommended range of rib height is considered advantageous in ensuring an optimal balance between improved flame stabilization and maintaining a satisfactory level of combustion efficiency. The findings provide valuable insights for optimizing micro-thermophotovoltaic systems.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of H2/Air fueled micro combustion characteristics with trapezoidal ribs for micro thermophotovoltaic applications: Effect of rib height

Lachraf,

Si Ameur

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…By extensive research of Tang et al 32 and Su et al, 33 it could be known that multi‐channels in micro‐combustor could achieve higher radiation energy and radiation efficiency due to the improvement of thermal performance. Moreover Tang et al 34 developed a micro‐combustor with an inserted cross plate, and the result showed that the cross plate was beneficial for thermal performance between inner wall and outer wall, so as to increase the average wall temperature apparently. Nadimi et al 35 proposed a micro‐combustor with micro‐fin inserted in the chamber, and the special structure could transfer of heat from center to inner wall.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on the emitter power and energy conversion efficiency improvement of micro‐cylindrical combustor by an internal spiral fin for micro‐thermophotovoltaic systems

Zhao

Yan

et al. 2021

Int J Energy Res

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Aiming at improving the energy output and energy conversion efficiency of thermophotovoltaic systems, a micro-combustor with high and uniform outer wall temperature is desirable. Therefore, the micro-cylindrical combustor with a novel micro-spiral fin is proposed to improve the thermal performance. The effect of inlet velocities of premixed hydrogen/air, the critical design parameters of the spiral fin length (L) and the spiral fin pitch (W) on the thermal performance of the micro-cylindrical combustor are numerically investigated.Results show that micro-spiral fin is beneficial to improve the outer wall temperature value and uniformity, which can significantly increase the emitter power and energy conversion efficiency of micro-cylindrical combustor. However, the improvement of thermal performance is at the cost of higher pressure loss. Furthermore, compared with all the investigated geometrical models, the micro-cylindrical combustor with spiral fin length at the size of 14 mm and spiral fin pitch at the size of 2.355 mm obtains the best comprehensive heat transfer performance.

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“…While, for extremely hot wind of 1001 K the blowout occurs easily. Tang et al 3 carried out experimental and numerical study on premixed propane/air flames in a planer micro combustor with a cross-plate insert. They reported that the cross-plate in micro combustor widens the blowout limit.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on the blow-off limit of premixed hydrogen/air flames in a cylindrical micro-combustor

Naeemi

Hashemi

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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In the current work, a numerical study on combustion of premixed H2–air in a micro-cylindrical combustor was carried out and the critical velocity of inlet flow that causes the blow-off was obtained. Furthermore, the effects the equivalence ratio, wall thickness, geometry of combustor and thermal properties of walls on the critical blow-off velocity were studied. The numerical results showed that, increasing the equivalence ratio results in higher critical blow-off velocity. A micro combustor with thicker wall had better flame stability. As the combustor dimeter is decreased the blow-off occur in lower inlet flow velocity. Higher thermal conductivity of walls increases the critical blow-off velocity. In addition, with varying heat convection coefficient (h) and emissivity coefficient [Formula: see text] of the walls from 1 to 60 W/m2.K and 0.2 to 0.8 respectively, the critical blow-off velocity is reduced and shows the importance of wall thermal properties in the design and operation of micro-combustors.

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Experimental and numerical study of premixed propane/air combustion in the micro-planar combustor with a cross-plate insert

Cited by 35 publications

References 36 publications

Numerical investigation of H2/Air fueled micro combustion characteristics with trapezoidal ribs for micro thermophotovoltaic applications: Effect of rib height

Numerical investigation of H2/Air fueled micro combustion characteristics with trapezoidal ribs for micro thermophotovoltaic applications: Effect of rib height

Numerical investigations on the emitter power and energy conversion efficiency improvement of micro‐cylindrical combustor by an internal spiral fin for micro‐thermophotovoltaic systems

A numerical study on the blow-off limit of premixed hydrogen/air flames in a cylindrical micro-combustor

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