Numerical study on energy conversion performance of micro-thermophotovoltaic system adopting a heat recirculation micro-combustor

Tang, Aikun; Cai, Tao; Huang, Qiuhan; Deng, Jiang; Pan, Jianfeng

doi:10.1016/j.fuproc.2018.07.034

Cited by 59 publications

(4 citation statements)

References 58 publications

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“…However, to the best knowledge of the present authors, there are few reports on the NO x emissions of burning ammonia in micro-planar combustors. This type of micro-combustors is widely integrated in micro-thermophotovoltaic systems [33,34]. This partially motivates the present work.…”

Section: Introductionmentioning

confidence: 65%

Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen

Cai

Zhao

Jiaqiang

2020

Chemical Engineering and Processing - Process Intensification

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Section: Introductionmentioning

confidence: 65%

Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen

Cai

Zhao

Jiaqiang

2020

Chemical Engineering and Processing - Process Intensification

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“…The study found that combustion could be sustained in low-temperature "flameless" mode, even at flow velocities 30 times the stoichiometric laminar burning velocity. Tang et al [5] numerically found that the overall efficiency of a heat recirculation combustor is almost twice as large as that obtained in a non-recirculation straight channel combustor. Taywade et al [6] developed an external heat recirculation combustor, and the external heating cup was observed to significantly enhance the flame stability limits.…”

Section: Heat Recirculationmentioning

confidence: 93%

Combustion Characteristics of Sinusoidal-Shaped Walls with Catalyst Segmentation in Micro-Combustors for Micro-Thermophotovoltaic Application

Yuan,

Guo,

2024

Energies

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The combustion characteristics of micro-combustors significantly impact the performance of micro-thermophotovoltaic (MTPV) systems. This study aims to investigate the effects of sinusoidal-shaped walls and catalyst segmentation on flame stability and combustion performance in a micro-combustor by using numerical methods. The numerical simulation with detailed gas-phase and surface reaction mechanisms is reliable, as the results of numerical simulation align with experimental data. The results show that the interplay between flame stability and sinusoidal-shaped walls is crucial, particularly because of the cavities formed by the sinusoidal-shaped walls of the micro-combustor. The gas-phase ignition position of the sinusoidal-shaped wall combustor moves upstream by 0.050 m compared to the planar-wall combustor, but the flame is stretched. The catalyst segments coated on the crest can shorten the flame length and increase the average temperature by a maximum 62 K, but delay the gas-phase ignition. Conversely, catalyst segments coated on the trough can advance ignition, but this results in flame elongation and a decrease in the average temperature. The rational combination of catalyst segmentation and sinusoidal-shaped walls facilitates moving the ignition position upstream by a maximum of 0.065 m while substantially reducing the length of the combustor required for complete fuel conversion by more than 60%. These attributes are highly beneficial for improving efficiency and minimizing the length of the micro-combustor for MTPV application.

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“…It is found that heat recirculating is beneficial to increase the methane conversion rate and improve stable combustion. Similarly, Tang [36] designed a flat U-shaped combustor and studied the energy conversion efficiency of the entire micro-thermal photovoltaic system (MTPV). It is found that compared with the traditional straight-channel micro-combustor, its energy conversion efficiency has doubled.…”

Section: Introductionmentioning

confidence: 99%

Influence of Porous Media Aperture Arrangement on CH4/Air Combustion Characteristics in Micro Combustor

Wang

Feng

et al. 2021

Processes

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Micro-electro-mechanical systems (MEMS) occupy an important position in the national economy and military fields, and have attracted great attention from a large number of scholars. As an important part of the micro-electromechanical system, the micro-combustor has serious heat loss due to its small size, unstable combustion and low combustion efficiency. Aiming at enhancing the heat transfer of the micro-combustor, improving the combustion stability and high-efficiency combustion, this paper embedded porous media in the combustor, and the effects of different parameters on the combustion characteristics were numerically studied. The research results showed that the layout of porous media should be reasonable, and the small and large pore porous media embedded in the inner and outer layers, respectively, can bring better combustion performance. Meanwhile, A: 10–30 has a high and uniform temperature distribution, and its methane conversion rate reached 97.4%. However, the diameter ratio of the inner layer to the outer layer (d/D) of the porous medium should be maintained at 0.4–0.6, which brings a longer gas residence time, and further enables the pre-mixed gas to preheat and burn completely. At a d/D of 0.5, the combustor has the highest outer wall temperature and CH4 conversion efficiency. Besides, compared with the pore size increasing rate of Δn = 10 PPI and Δn = 10 PPI, the radial temperature distribution of the Δn = 10 PPI combustor is more uniform, meanwhile avoids the occurrence of local high temperature. Under the condition of Δn = 10 PPI, A: 20–30 layout maintains excellent thermal and combustion performance. In addition, the lean flammable limits of MC-U20, MC-10/30-0.8, and MC-20/30-0.5 were compared, at an inlet velocity of 0.5 m/s, the corresponding lean flammable limits are 0.5, 0.4, and 0.3, respectively, among them MC-20/30-0.5 has a wider flammable limit range, showing excellent combustion stability. This research has guiding significance for the combustion stability of the micro combustor.

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Numerical study on energy conversion performance of micro-thermophotovoltaic system adopting a heat recirculation micro-combustor

Cited by 59 publications

References 58 publications

Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen

Bluff-body effect on thermal and NO emission characteristics in a micro-planar combustor fueled with premixed ammonia-oxygen

Combustion Characteristics of Sinusoidal-Shaped Walls with Catalyst Segmentation in Micro-Combustors for Micro-Thermophotovoltaic Application

Influence of Porous Media Aperture Arrangement on CH4/Air Combustion Characteristics in Micro Combustor

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