Multiscale modeling and general theory of non-equilibrium plasma-assisted ignition and combustion

Suo Yang, Sharath Nagaraja, Wenting Sun, Vigor Yang

研究成果: Review article同行評審

42 引文 斯高帕斯(Scopus)

摘要

A self-consistent framework for modeling and simulations of plasma-assisted ignition and combustion is established. In this framework, a 'frozen electric field' modeling approach is applied to take advantage of the quasi-periodic behaviors of the electrical characteristics to avoid the re-calculation of electric field for each pulse. The correlated dynamic adaptive chemistry (CO-DAC) method is employed to accelerate the calculation of large and stiff chemical mechanisms. The time-step is dynamically updated during the simulation through a three-stage multi-time scale modeling strategy, which utilizes the large separation of time scales in nanosecond pulsed plasma discharges. A general theory of plasma-assisted ignition and combustion is then proposed. Nanosecond pulsed plasma discharges for ignition and combustion can be divided into four stages. Stage I is the discharge pulse, with time scales of O (1-10 ns). In this stage, input energy is coupled into electron impact excitation and dissociation reactions to generate charged/excited species and radicals. Stage II is the afterglow during the gap between two adjacent pulses, with time scales of O (1 0 0 ns). In this stage, quenching of excited species dissociates O2 and fuel molecules, and provides fast gas heating. Stage III is the remaining gap between pulses, with time scales of O (1-100 μs). The radicals generated during Stages I and II significantly enhance exothermic reactions in this stage. The cumulative effects of multiple pulses is seen in Stage IV, with time scales of O (1-1000 ms), which include preheated gas temperatures and a large pool of radicals and fuel fragments to trigger ignition. For flames, plasma could significantly enhance the radical generation and gas heating in the pre-heat zone, thereby enhancing the flame establishment.

原文English
文章編號433001
期刊Journal of Physics D: Applied Physics
50
發行號43
DOIs
出版狀態Published - 2017 九月 26

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

指紋 深入研究「Multiscale modeling and general theory of non-equilibrium plasma-assisted ignition and combustion」主題。共同形成了獨特的指紋。

引用此