A Model for Plasma-Combustion Coupling and its Effect on the Ignition of a Dielectric-Barrier Discharge Actuated Hydrogen Jet

摘要

Plasma and combustion are coupled at high temperature by correlations terms in the electron and neutral energy equations. These terms represent the effect of neutral temperature in reducing specific collisional losses and thus increasing the electron energy and the concomitant action of the electron temperature in increasing the Joule heating. Joule heating is a favorable contribution to the neutral energy budget, thus the coupling leads to a closed loop feedback that self-sustains high temperature kernels. The research presented in this paper shows that such kernels created by plasma-combustion coupling are an important contribution to the ignition of laminar hydrogen jets in a turbulent cross-flow. The coupling selectively amplifies the energy and radical contributions by the discharge at the ignition hot spot. These contributions dominates the evolution of hot spots interacting with electric field layers over dielectric surfaces and are a key ingredient of predictive ignition models.