Flame stabilization in a planar microcombustor partially filled with anisotropic porous medium

Meng, Liang; Li, Jun; Li, Qingqing; Shi, Junrui

doi:10.1002/aic.15862

Cited by 12 publications

(2 citation statements)

References 22 publications

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“…mesh or granule diameter) approaches the microcombustor channel width. Meng et al [34] noted that studies using porous anisotropy have been limited to microcombustors of widths between 1 to 2 mm. The porous material approach focuses on the delivery of excess enthalpy to the upstream flow.…”

Section: Methods Of Heat Recirculation For Flame Stabilitymentioning

confidence: 99%

Numerical Modelling of Anisotropic Heat Recirculation in Microcombustors

Chong¹

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The primary motivation for this study is provided by the need for numerical simulations of anisotropic walls of microcombustors which are hypothesised to have a stabilising effect on flame temperatures in microcombustion. A literature review on the topics of wall conduction effects and heat recirculation on flame stability, anisotropic thermal conduction and heat conduction numerical methods are conducted. It is concluded that a finite volume method is most suitable for the desired purpose due to existing code infrastructure in The University of Queensland's own gas dynamics solver Eilmer, for which the capability upgrade is being designed and implemented. An implicit Euler method is selected and the method outlined and implemented using Newton's method. The implementation is verified using observed order of error (OOE). Suitable values for solver tolerances are found specific to the problem tested but also considered indicative of a reasonable range for default values. Homogeneous thermal anisotropy in the form of orthotropy is verified (using OOE via method of manufactured solutions (MMS)) and validated (using an experimental case from Hornbaker [17]). A demonstration of thermal orthotropy on a simplified microcombustor is presented, confirming that significant redirection of heat can be achieved for the purposes of improving flow preheating and reducing external heat losses. Suggestions for future work are provided; in particular, highlighting the need for completion of inhomogeneous anisotropy implementation, full thermal anisotropy (as opposed to orthotropic anisotropy) and temporal lagging.

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Section: Methods Of Heat Recirculation For Flame Stabilitymentioning

confidence: 99%

Numerical Modelling of Anisotropic Heat Recirculation in Microcombustors

Chong¹

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“…Meng et al [156] studied the flame stability limits for premixed H 2 /air combustion when it was partially filled with porous medium. The porous medium was manually created from fine stainless steel mesh with a three-folding scheme to acquire the anisotropic properties.…”

Section: Effect Of Filling Position and Folding Schemesmentioning

confidence: 99%

Effect of Different Technologies on Performance Enhancement of the Micro-Combustor for the Micro Thermophotovoltaic Application: A Review

et al. 2021

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With the improvement and development of micro-mechanical manufacturing technology, people can produce an increasing variety of micro-electromechanical systems in recent years, such as micro-satellite thrusters, micro-sensors, micro-aircrafts, micro-medical devices, micro-pumps, and micro-motors. At present, these micro-mechatronic systems are driven by traditional energy power systems, but these traditional energy power systems have such disadvantages as short endurance time, large size, and low energy density. Therefore, efforts were made to study micro-energy dynamical systems with small size, light gravity, high density and energy, and long duration so as to provide continuous and reliable power for these systems. In general, the micro-thermal photoelectric system not only has a simple structure, but also no moving parts. The micro-thermal photoelectric system is a micro-energy power system with good application prospects at present. However, as one of the most important structural components of micro-thermal photoelectric systems, the microburner, is the key to realize the conversion of fuel chemical energy to electric energy in micro-thermal photoelectric system. The studies of how to improve the flame stability and combustion efficiency are very necessary and interesting. Thus, some methods to improve the performance of micro-burners were introduced and summarized systematically, hoping to bring some convenience to researchers in the field.

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