| Well-developed in the study of military aircraft, plasma-assisted combustion, which is considered a promisingsubject, is extending its stage of application in energy, vehicles and environment protecting. The coupling of quantum mechanics, combustion, kinetics and electromagnetic makes it much more difficult to obtain detailed mechanism of plasma-assisted combustion. Numerical simulation and experiment research were both used in this paper to analyze their own effect of electron’s and non-electron species’ to the combustion system.The EEDF(electron energy distribution function) is a critical parameter for modeling plasma-assisted combustion. Therefore, the Boltzmann Equation was solved to obtain the EEDF of the plasma. Comparing the result to classic models, a conclusion had been drawn that the Boltzmann solution could be replaced by Druyvesteyn Distribution, which is very simple, and accurate enough for solving the model of plasma-assisted combustion.Electron density, electron temperature and electric field intensity were calculated in this paper. Kinetic enhancement of O indicates that the plasma not only enriches the sources of O, but also makes it faster to produce O, thus decreasing the ignition delay time. On the other hand, the large number of plasma-produced N and O makes the formation of NOx much easier, which will lead to the increasing of flame temperature.A plasma-assisted combustion platform was built, the V-A curve and the emission spectrum of different flames were detected. Factors that influence the probe current were summarized via sheath theory, electron density was calculated according to the V-A curves and related parameters, which matches well to the results of numerical simulation. The characteristic spectrum of CH4/air premixed flame and plasma-assisted flame were discussed. Sources of important radicals, OH and NOx for instance, and their effects to the combustion system were studied to acquire better understanding of plasma-assisted combustion. |
PDF Full Text Request