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Plasma Sci. Technol. ›› 2018, Vol. 20 ›› Issue (12): 125502-125502.doi: 10.1088/2058-6272/aacdef

• 等离子体技术 • 上一篇    下一篇

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

  

  • 收稿日期:2018-02-06 出版日期:2018-10-09 发布日期:2018-06-20

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

Jun DENG (邓俊), Liming HE (何立明), Xingjian LIU (刘兴建) and Yi CHEN (陈一)   

  1. Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi’an 710038, People’s Republic of China
  • Received:2018-02-06 Online:2018-10-09 Published:2018-06-20
  • Supported by:

    This work is supported by National Natural Science Foundation of China (No. 51436008).

Abstract:

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 ms -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 H2O 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.

Key words: dielectric barrier discharge, plasma-assisted combustion, combustion chamber, numerical simulation

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