A CFD study of ignition of lean propane-air mixtures in a heat recirculating U-bend catalytic microreactor

Yedala, Neha; Kaisare, Niket S.

doi:10.1016/j.cherd.2021.06.019

Cited by 4 publications

(1 citation statement)

References 51 publications

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“…It is found that compared with the traditional straight-channel micro-combustor, its energy conversion efficiency has doubled. In addition, a large number of studies have shown that the heat recirculation combustion technology has better thermal performance, and it can be used to enhance combustion at a small scale [37][38][39][40][41]. As an excellent thermal management method, porous media combustion has also received extensive attention from scholars, because the gas has a strong coupling effect with the porous medium during the combustion process, it can strengthen the overall combustion reaction and improve the combustion efficiency.…”

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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