Experimental study on electro-spraying and combustion characteristics in meso-scale combustors

Gan, Yunhua; Tong, Yang; Ju, Yiguang; Zhang, Xia; Li, Haige; Chen, Xiaowen

doi:10.1016/j.enconman.2016.11.015

Cited by 44 publications

(14 citation statements)

References 29 publications

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“…In the experiments, the direct measurement error comes from the uncertainties of the measuring tools or systems, such as data acquisition instrument and PDA. In another case, some parameters (specific charge in this study) cannot be measured directly and are calculated based on other direct measured parameters, which brings the indirect measurement error 28 .where x j is directly measured parameter, σ xj is the error of directly measured parameter, and σ y is the error of indirectly measured parameter. The important errors are summarized in Table 2.…”

Section: Experimental Methodsmentioning

confidence: 98%

A comparative study on droplet characteristics and specific charge of ethanol in two small-scale electrospray systems

Gan

Jiang

et al. 2019

Sci Rep

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An investigation on the droplet characteristics of ethanol in small-scale combustors with two different systems was conducted experimentally and theoretically. The classical capillary-mesh electrode arrangement was applied in Type A electrospray system, and for Type B, an additional ring electrode is included. The droplet size and velocity were measured by a Phase Doppler Anemometer. The electric filed intensity was theoretically calculated in the two electrospray systems. Compared with Type A, Type B system has smaller droplet size and velocity in the same spraying mode. Meanwhile the electrospray process in Type B system is more stable than that in Type A with its smaller root mean square velocity. By measuring the spraying current, the average specific charge of the droplets for the two systems was obtained in different spraying modes. And it was found that the addition of the ring electrode can help to increase the droplet charge, which is the fundamental reason for Type B electrospray system to perform better. The corona charge of the droplets was theoretically calculated for the two electrospray systems. It was found that the calculated specific charge generated by corona charging was in good agreement with the experimental results.

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Section: Experimental Methodsmentioning

confidence: 98%

A comparative study on droplet characteristics and specific charge of ethanol in two small-scale electrospray systems

Gan

Jiang

et al. 2019

Sci Rep

Self Cite

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“…Similarly, benefitting from the recirculation zone arising from the swirling flow, meso-combustor with the vortox flow enlarges operating ranges of flame combustion. 24 In addition, meso-scale combustion systems using liquid hydrocarbon fuels with high energy density have been investigated experimentally and numerically, 27,28 and electro-spraying and electric fields management have been proposed to improve stability of liquid combustion in these systems. It was pointed out that combustion limit of premixed CH 4 /air in "Swiss-roll" structure combustor was extended.…”

Section: Discussionmentioning

confidence: 99%

“…The preheating effect upstream and heat recovery effect downstream could extend the flame stability limits, especially for very lean mixtures. 24 In addition, meso-scale combustion systems using liquid hydrocarbon fuels with high energy density have been investigated experimentally and numerically, 27,28 and electro-spraying and electric fields management have been proposed to improve stability of liquid combustion in these systems. 29,30 Benefited from enhanced mass transfer in small channels, catalytic micro-combustion/meso-combustion could obtain wider operating ranges of flow and composition.…”

Section: Introductionmentioning

confidence: 99%

Thermal management and catalytic combustion stability characteristics of premixed methane/air in heat recirculation meso-combustors

et al. 2017

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Summary In order to illuminate heat recirculation effect on catalytic combustion stability and further improve energy conversion efficiency in meso‐combustor, the catalytic combustion characteristics of the combustor with/without preheating channels are numerically studied at steady conditions. It is found that methane conversion rate and combustion efficiency increases by 2% to 3% and approximately 9% in the heat recirculation meso‐combustor, indicating that heat recirculation effect facilitates more complete combustion of methane and medium components. Preheating channels show positive effects on improving combustion stability in the heat recirculation meso‐combustor. On one hand, preheating channels facilitate heat recirculation effect, and heat recirculation rate exceeds 10% for all cases and reaches 31.8% with an inlet velocity of 0.5 m/s, leading to significant increment of methane‐specific enthalpy at the preheating channel outlet. On the other hand, Rh(s)/O(s) ratios of catalytic surface and catalytic surface temperature in main reaction zone are enlarged by the preheating channels, facilitating methane adsorption at catalytic surface. Specially, most of fuels are consumed in a shorter distance with higher methane conversion speed, which brings benefits to promote combustion efficiency and may be helpful to inhibit the combustion instability in heat recirculation meso‐combustors.

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“…Due to high energy density, long life, and instantly rechargeable power supplies, the micro power systems based on hydrocarbon fuels combustion have attracted the extensive attention [1][2][3][4][5][6][7][8] in recent two decades. Consequently, the micro power systems possess a great application potential in energy supplies of military and civilian portable devices.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on ignition intensification of n‐butane with tert‐butyl hydroperoxide (TBHP) addition

et al. 2019

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Summary Aimed to intensify the ignition and combustion process of n‐butane fuel in micro internal combustion (IC) engines, ignition delay characteristics of n‐butane/air mixtures with tert‐butyl hydroperoxide (TBHP) addition ratios below 10% were investigated numerically by CHEMKIN‐PRO software. Results show that ignition delay times of n‐butane can be shortened nonlinearly with TBHP addition at initial temperatures of 650 K to 1000 K, namely, the reduction rate of ignition delay times rises slowly as the TBHP addition ratio increases. In addition, the negative temperature coefficient (NTC) behavior can be weakened significantly with TBHP addition at 650 K to 1000 K. Especially, the ignition delay time of n‐butane can be reduced about 32 times with 10% TBHP addition at 750 K. However, the ignition intensification effect of TBHP addition is slight when the initial temperature is above 1000 K. The acting mechanism of TBHP addition was investigated in detail by the rate of production and consumption (ROP), sensitivity, and reaction pathway analysis. The ROP analysis shows that the released and quickly consumed OH radicals with TBHP addition play an important role in promoting n‐butane ignition at the lower initial temperature. However, the relatively slow consumption rate of OH radicals at higher temperature weakens the intensification effect. Furthermore, the sensitivity analysis and reaction pathway analysis indicate that the dominated elemental reactions and reaction pathway vary significantly with TBHP addition at lower initial temperature.

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Experimental study on electro-spraying and combustion characteristics in meso-scale combustors

Cited by 44 publications

References 29 publications

A comparative study on droplet characteristics and specific charge of ethanol in two small-scale electrospray systems

A comparative study on droplet characteristics and specific charge of ethanol in two small-scale electrospray systems

Thermal management and catalytic combustion stability characteristics of premixed methane/air in heat recirculation meso-combustors

Numerical investigation on ignition intensification of n‐butane with tert‐butyl hydroperoxide (TBHP) addition

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