Experimental and numerical investigation on combustion characteristics of premixed hydrogen/air flame in a micro-combustor with a bluff body

Wan, Jianlong; Fan, Aiwu; Maruta, Kaoru; Yao, Hong; Liu, Wei

doi:10.1016/j.ijhydene.2012.09.154

Cited by 210 publications

(56 citation statements)

References 35 publications

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“…The small channels also result in high velocity gradients in the fluid, which as the aforementioned boundary conditions indicate, lead to high wall frictional losses, and high convective heat transfer coefficients. These in turn can result in large pressure losses, high heat transfer to or from the fluid to the wall, as well as enhanced diffusive mixing [10]. This next section will attempt to address issues related channels where the flow is laminar (1 < Re < 2300), including pressure drops in channels, fluidic mixing, issues with the introduction of liquid fuels, micro-scale phase change and some microfluidic applications.…”

Section: Fluid Dynamicsmentioning

confidence: 99%

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Chen

2015

ILCPA

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The miniaturization of electro-mechanical devices, and the resulting need for micro-power generation (milliwatts to watts) with low weight, long life devices, has led to the recent development of the field of micro-scale combustion and power generation. The primary objective of this new field is to leverage the high energy density of fuels, specifically liquid hydrocarbon fuels relative to batteries and all other energy storage devices other than nuclear fission, fusion or decay. Some brief scaling arguments are given in this work, and more detailed efforts are referred. A brief introduction to several of the fabrication techniques is presented in this work. Hydrogen-based and some preliminary specialty fuel micro-fuel cells have been successfully developed, and there is a need to develop reliable reformers (or direct conversion fuel cells) for liquid hydrocarbons so that the fuel cells become competitive with the batteries. In this work, the technological issues related to micro-scale combustion and the development of thermochemical devices for power generation will be discussed. Some of the systems currently being developed will be presented, ongoing critical study issues under investigation, and other potential areas of development discussed. Comments regarding the opportunities and limitations of each of the techniques are also presented where applicable.

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Section: Fluid Dynamicsmentioning

confidence: 99%

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Chen

2015

ILCPA

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“…In the past years, many attempts have been made to explore the possibility of implementing various forms of combustion in micro-or mesoscale combustors. Along this line, it has been found that under certain conditions both premixed and non-premixed flames are possible to be stabilized in narrow tubes or narrow channels [10][11][12][13][14] ; see, e.g. the review articles [15][16][17] for more references.…”

Section: Introductionmentioning

confidence: 98%

Near limit premixed flamelets in Hele-Shaw cells

Chen

Wang

2017

Proceedings of the Combustion Institute

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In this paper, we report a preliminary attempt to stabilize near limit premixed flamelets in Hele-Shaw cells. As a quasi-two-dimensional analog of flame balls, the flamelet is sustained by diffusive transport alone, with fuel supplied from the open ends of the Hele-Shaw cell, and heat dissipated to the ambient environment through conduction; radiative heat losses from both phases are neglected. Following Spalding's "one-dimensional idealization" approximation, we construct a 2-D model to account for the heat and mass transfer processes in both the gas and the solid phases, with the gap height as a parameter controlling the heat exchange rate between the two phases. For each of the three kinds of wall materials considered, two steady solution branches are obtained as a function of the gap height, one corresponding to large flames and the other to small flames. The large flame branch is critically dependent on the boundary and is therefore of little physical value. Linear stability analysis shows that the small flame branch is unstable to random perturbations. 2-D time dependent numerical simulations indicate that a slightly perturbed steady state on the small flame branch either evolves into a single flamelet drifting to the boundary as a whole, or splits into two drifting to the boundary along opposite directions. A partially open square Hele-Shaw combustor has been proposed and is shown to be able to support stabilized flamelets for a certain range of the degree of opening.

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“…Various works have been done in this topic in the past decades. Wan et al 41 investigated the effect of different bluff bodies [1] and wall cavities [2] in a planar micro-42 channel on flammability limits of H2-air combustion. They observed that blow-off limit is greatly 43 extended as compared with that of the micro-combustor without using them.…”

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confidence: 99%

“…61 [1]. The emphasize in their work was to investigate the flashback limits of the flame in micro-62 scale ( [6], [7]), and the physics underlying the asymmetric behavior of the flame was not 63 discussed in their study.…”

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confidence: 99%

Asymmetric hydrogen flame in a heated micro-channel: Role of Darrieus–Landau and thermal-diffusive instabilities

Alipoor

Mazaheri

Pour

et al. 2016

International Journal of Hydrogen Energy

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Experimental and numerical investigation on combustion characteristics of premixed hydrogen/air flame in a micro-combustor with a bluff body

Cited by 210 publications

References 35 publications

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Review on Progress and Challenges of the Power Generation Systems at Micro-Scales

Near limit premixed flamelets in Hele-Shaw cells

Asymmetric hydrogen flame in a heated micro-channel: Role of Darrieus–Landau and thermal-diffusive instabilities

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