The analytical investigation of premixed combustion in cylindrical micro-combustor

In this study, an analytical model for heat recirculation in cylindrical micro-combustors is presented, including the effects of heat transfer from the product gas stream in the reaction zone and post-flame region to the reactant in the preheat zone, structural heat conduction through the combustor walls and heat loss to ambient. Eventually, the explicit expression for the flame speed in non-adiabatic condition and the implicit expression for adiabatic condition are obtained in this research. In addition, comparison is made between adiabatic and non-adiabatic flame speeds. It is demonstrated that the streamwise heat conduction through the structure of combustor plays an important role in the flame broadening in both adiabatic and non-adiabatic conditions. Moreover, it is shown that reducing the size of the combustor to a submillimetre scale extremely increases the surface-to-volume ratio, leading to the decrease in the flame speed and flame quenching.

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Numerical study of the geometrical parameters on CH4/air premixed combustion in heat recirculation micro-combustor

Fuel ◽

10.1016/j.fuel.2015.06.069 ◽

2015 ◽

Vol 159 ◽

pp. 45-51 ◽

Cited By ~ 29

Author(s):

Yunfei Yan ◽

Wenli Pan ◽

Li Zhang ◽

Weimin Tang ◽

Yanrong Chen ◽

...

Keyword(s):

Numerical Study ◽

Premixed Combustion ◽

Geometrical Parameters ◽

Heat Recirculation ◽

Micro Combustor

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EXPERIMENTAL AND ANALYTICAL INVESTIGATION OF THE HEAT CONDUCTION WITH PHASE CHANGE

Proceeding of International Heat Transfer Conference 7 ◽

10.1615/ihtc7.720 ◽

1982 ◽

Author(s):

Song You-wang ◽

Ge Xin-shi

Keyword(s):

Heat Conduction ◽

Phase Change ◽

Analytical Investigation

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Investigation on premixed methane/air combustion characteristics in heat recirculation micro combustor with separating cylinder

Chemical Engineering and Processing - Process Intensification ◽

10.1016/j.cep.2020.107987 ◽

2020 ◽

Vol 153 ◽

pp. 107987 ◽

Cited By ~ 3

Author(s):

Ziqiang He ◽

Yunfei Yan ◽

Shuai Feng ◽

Xiuquan Li ◽

Zhongqing Yang ◽

...

Keyword(s):

Combustion Characteristics ◽

Heat Recirculation ◽

Micro Combustor

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On the equivalent effect of initial temperature and pressure coupling on the flame speed of methane premixed combustion under dilution

Energy ◽

10.1016/j.energy.2020.118269 ◽

2020 ◽

Vol 207 ◽

pp. 118269 ◽

Cited By ~ 1

Author(s):

Zhiqiang Han ◽

Zhennan Zhu ◽

Wenbin Yu ◽

Kun Liang ◽

Zinong Zuo ◽

...

Keyword(s):

Initial Temperature ◽

Flame Speed ◽

Premixed Combustion ◽

Equivalent Effect ◽

Temperature And Pressure

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Numerical investigation on hydrogen/air non-premixed combustion in a three-dimensional micro combustor

Energy Conversion and Management ◽

10.1016/j.enconman.2016.07.048 ◽

2016 ◽

Vol 124 ◽

pp. 427-438 ◽

Cited By ~ 41

Author(s):

Jiaqiang E ◽

Qingguo Peng ◽

Xueling Liu ◽

Wei Zuo ◽

Xiaohuan Zhao ◽

...

Keyword(s):

Numerical Investigation ◽

Three Dimensional ◽

Premixed Combustion ◽

Micro Combustor

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Thermal performance of a micro combustor with heat recirculation

Fuel Processing Technology ◽

10.1016/j.fuproc.2012.11.002 ◽

2013 ◽

Vol 109 ◽

pp. 179-188 ◽

Cited By ~ 47

Author(s):

Upendra W. Taywade ◽

Anil A. Deshpande ◽

Sudarshan Kumar

Keyword(s):

Thermal Performance ◽

Heat Recirculation ◽

Micro Combustor

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The gaseous oxidation of aliphatic alcohols. I. Ethyl alcohol: the products formed in the early stages

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1956.0195 ◽

1956 ◽

Vol 237 (1211) ◽

pp. 530-542 ◽

Cited By ~ 22

Keyword(s):

Hydrogen Peroxide ◽

Induction Period ◽

Ethyl Alcohol ◽

Critical Concentration ◽

Volume Ratio ◽

Analytical Investigation ◽

Moderate Increase ◽

Early Stages ◽

Low Pressures

A detailed analytical investigation has been made of the reactions occurring during the early stages of the oxidation of ethyl alcohol (ethanol) in the temperature region 270 to 370° C. During an induction period the alcohol is converted quantitatively into acetaldehyde until a critical concentration of this intermediate has accumulated. The pressure then begins to rise autocatalytically, and methanol, formaldehyde and carbon monoxide become detectable; evidence is presented to show that these compounds arise from the further oxidation of acetaldehyde. The amount of ethanol consumed and of acetaldehyde formed at the end of the induction period are largely independent of the initial reactant pressures, except at low pressures of the alcohol. A study of the effect of added acetaldehyde shows that the minimum quantity required to eliminate the induction period is the same as that normally present at the end of the induction period. Hydrogen peroxide is the only product, other than acetaldehyde, detected during the induction period. Under optimum surface conditions the yields of hydrogen peroxide are equivalent to those of the aldehyde. A moderate increase in surface shortens the induction period, but a further increase retards reaction. In vessels of large surface: volume ratio, the yields of hydrogen peroxide are much reduced, while in a potassium chloride-coated vessel peroxides are invariably absent; in each case, the other products are unchanged. The mechanisms of the chain-initiating and propagating reactions are considered and the role of the surface in initiating and terminating chains is discussed.

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