Numerical study on stability and influencing factors of heterogeneous reaction for hydrogen/oxygen mixture in planar catalytic micro combustor

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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Numerical study on a multiple-channel micro combustor for a micro-thermophotovoltaic system

Energy Conversion and Management ◽

10.1016/j.enconman.2016.04.088 ◽

2016 ◽

Vol 120 ◽

pp. 197-205 ◽

Cited By ~ 44

Author(s):

Yang Su ◽

Qiang Cheng ◽

Jinlin Song ◽

Mengting Si

Keyword(s):

Numerical Study ◽

Multiple Channel ◽

Micro Combustor

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A Numerical Study for Heat Transfer Characteristics of a Micro Combustor by Large Eddy Simulation

Numerical Heat Transfer Part A Applications ◽

10.1080/10407780903163470 ◽

2009 ◽

Vol 56 (3) ◽

pp. 230-245 ◽

Cited By ~ 9

Author(s):

Hang Seok Choi ◽

Tae Seon Park

Keyword(s):

Heat Transfer ◽

Large Eddy Simulation ◽

Numerical Study ◽

Heat Transfer Characteristics ◽

Transfer Characteristics ◽

Eddy Simulation ◽

Large Eddy ◽

Micro Combustor

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The Analytical Modeling of Finite-Length Homogonous Micro-Combustor for a Hydrogen-Oxygen Mixture with Wall Temperature Effects

Journal of Mechanics ◽

10.1017/jmech.2016.11 ◽

2016 ◽

Vol 32 (5) ◽

pp. 631-642 ◽

Cited By ~ 8

Author(s):

S. A. Fanaee

Keyword(s):

Reaction Zone ◽

Finite Length ◽

Wall Temperature ◽

Iterative Solution ◽

Maximum Temperature ◽

Oxygen Mixture ◽

Governing Equations ◽

Computational Data ◽

Micro Combustor ◽

Acceptable Agreement

AbstractThis paper analytically investigates the reaction phenomenon in micro-combustors using a two-dimensional model. The length of micro-combustor is considered at finite length that makes a better physical model than other works. The micro-combustor medium is divided into three integral zones composed of preheat, reaction and post flame where the governing equations are solved using the matching conditions of neighboring zones. The reaction zone thickness is considered as a variable and predicted by an iterative solution. In order to validate the model, normalized magnitude of maximum temperature is compared with published computational data for different values of Peclet number that shows an acceptable agreement that confirms the accuracy of the predicted data. Since a higher wall temperature causes the reaction to be faster, increasing the normalized wall temperature will result to reduce reaction zone thickness.

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