**5. Conclusions**

In this paper, combustion experiments under DC voltage are carried out using typical vegetation. The heat release rate and spatial temperature distribution of vegetation combustion were measured. The shape and size of combustion particles were collected and analyzed. Through the coupled simulation of the temperature field, fluid field, electric field and particle motion, the forces on particles and the movement of the particles are analyzed. Combining with the actual vegetation combustion heat release rate, the simulation analysis is carried out. The model is modified by comparing with the actual temperature distribution. The simulation results are in good agreemen<sup>t</sup> with the experimental results. The situation of ash and carbon black particles in flame was obtained by experiments. In this paper, the motion of carbon black particles with different sizes is mainly analyzed. The force acting on the combustion particles is constantly changing during the rising process. When the charge of particles is the same as the polarity of the electrodes, the electric field force is always opposite to the drag force. When the charge of the particle is opposite to the polarity of the electrode, the particle will approach the electrode. The larger the charge-mass ratio, the easier it is to be captured and adsorbed by the electrodes, and the more charged are the particles farther away from the electrodes. Under the same charge-mass ratio, the larger the particle size, the easier it is to be captured by the electrode. The number of particles with a positive polar charge in flame is larger than that with a negative polar charge. The distribution characteristics of particles are different under positive and negative polarity DC voltage. The influence of charge statistical distribution on the space electric field will be considered for further analysis.

**Author Contributions:** Z.P. and T.W. propose the main idea of the paper. G.Z. and B.Y. conceived and designed the experiments. P.L. and C.Z. performed the experiments. Z.P. and C.Z. analyzed the data. The paper is written by Z.P. and is revised by T.W. and Y.X.

**Funding:** This work has been supported by the Natural Natural Science Foundation of China project (51607103). **Conflicts of Interest:** The authors declare no conflict of interest.
