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Numerical simulation of plasma-assisted combustion of methane-air mixtures in combustion chamber

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plasma Science and Technology 2018年第12期20卷 75-85页

作者： Jun DENG Liming HE Xingjian LIU Yi CHEN Science and Technology on plasma Dynamics Laboratory Air Force Engineering UniversityXi＇an 710038People＇s Republic of China

A two-dimensional mathematical model was developed to investigate the effects of dielectric barrier discharge （DBD） plasma on CH4-air mixtures combustion at atmospheric pressure. Considering the physical and chemical processes of plasma-assisted combustion （PAC）, plasma discharge, heat transfer and turbulent were simultaneously coupled into simulation of PAC. This coupling model consists of DBD kinetic model and methane combustion model. By comparing simulations and the original reference＇s results, a high-accuracy of this model was validated. In addition, the effects of PAC actuation parameters on combustion characteristics were studied. Numerical simulations show that with an inlet airflow velocity of 10 m s-1, a CH4-air mixtures＇ equivalence ratio of 0.5, an applied voltage of 10 kV, a frequency of 1200 kHz, compared to conventional combustion （CC）, the highest flame temperature rises by 32 K; outlet temperature distribution coefficient drops by 2.3%; the maximum net reaction rate of CH4 and H20 increase by 11.22% and 12.80% respectively; the maximum CO emission index decreases by 14.61%; the mixing region turbulence mixing time reduces by 89 ms.

关键词： dielectric barrier discharge plasma-assisted combustion combustion chamber numerical simulation

Comparison of the effect of different external electrodes on discharge plasma-assisted diffusion flame stabilization

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plasma Science and Technology 2024年第10期26卷 123-132页

作者： Siyin ZHOU Xiang LIU Wansheng NIE Shuhui YUAN Space Engineering University Beijing 101416People’s Republic of China

To optimize the design of plasma injectors,the influence of different external electrodes on plasma-assisted flame stabilization was assessed by using a nonequilibrium plasma injector flame control *** electrical characteristics of the injector,flame structure parameters,flame intensity,discharge power,and cost-to-effectiveness ratio under different external electrodes(four mesh electrodes and one copper foil electrode)were analyzed using electrical and optical *** results show that reducing the mesh size of the external electrode leads to a decrease in breakdown *** with a ceramic dielectric barrier-based injector,an injector with a quartz dielectric barrier produces a higher breakdown voltage under the same *** the same actuation voltage,the discharge current increases as the mesh size of the external electrode decreases,and combustion is enhanced by the discharge plasma;therefore,it is better to adopt a smaller mesh hole size to realize good flame stabilization under a lower actuation ***,under the studied working conditions,reducing the mesh hole size of the external electrode increases the cost-to-effectiveness ratio of plasma injector-based flame ***,considering the cost-to-effectiveness ratio and the weight of the injector,an external electrode with a larger mesh hole size should be chosen,which contradicts the above rule.

关键词： flame stabilization alternating current driven dielectric barrier discharge plasma injector plasma-assisted combustion external electrode

Effect of rotating gliding discharges on the lean blow-off limit of biogas flames

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plasma Science and Technology 2024年第10期26卷 116-122页

作者： Muhammad Saqib AKHTAR Mhedine ALICHERIF Bing WANG Deanna A.LACOSTE School of Aerospace Engineering Tsinghua UniversityBeijing 10084People’s Republic of China King Abdullah University of Science and Technology Physical Science and Engineering DivisionClean Combustion Research CenterThuwal 23955-6900Saudi Arabia

This study investigates the effect of a rotating gliding discharge on synthetic biogas combustion at atmospheric *** biogas was produced by mixing methane and carbon *** mixtures were considered:100%/0%,70%/30%,and 50%/50%of methane and carbon dioxide,*** plasma effect was investigated in a low-swirl-number burner equipped with a high-voltage electrode to produce gliding *** effect of plasma on the stability limits of the flame is reported for several electrical *** plasma-assisted combustion,the lean blow-off limits of biogas-air flames were significantly improved,which agrees with what can be found in the literature for other *** electrical parameters of the discharge and the plasma emissions were measured using electric probes and emission spectroscopy,*** mixture with the CO_(2)dilution was associated with a higher reduced electric field and higher ion production.A better understanding of the excited-species concentration evolution during plasma is necessary and will be investigated in future work.

关键词： plasma-assisted combustion non-equilibrium plasma methane carbon dioxide

New-concept swirl flame dynamics coupling plasma and particles

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Science Foundation in China 2017年第2期25卷 61-80页

作者： CUI Wei REN YiHua 李水清 Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Thermal EngineeringTsinghua UniversityBeijing 100084China

The coupling of swirl flame with discrete plasma or particle phases offers promising opportunities in combustion control and nanomaterial *** recent years,studies on the dynamics and stabilization of swirl flames have produced significant *** from swirl-stabilized combustion,we focus mainly on two recent trends in reviewing these new concepts in the field of combustion related to electrically/plasma-assisted dynamics control and flame aerosol synthesis of *** organize the material by four themes:(a)unsteady combustion dynamics and control methods;(b)electrically-and plasma-assisted combustion dynamics control;(c)swirl-flame-based synthesis of nanocomposites;and(d)in situ diagnostic methods for the complex combustion above.

关键词： swirl flame dynamics combustion instability plasma-assisted combustion flame synthesis in situ diagnostics