Research On Dual Mode Plasma Discharge Excited Aviation Fuel Combustion

Plasma enhanced combustion technology is one of the important research hotspots in the field of plasma scientific research in the world.Based on the practical problem of secondary ignition of aeroengines at aerial work platform,this paper proposes a solution to stimulate aviation fuel combustion with dielectric barrier+sliding arc dual-mode discharge.In this paper,a dual-mode discharge supporting combustion+ignition exciter was designed,and the excitation effect of dual-mode discharge on fuel was studied.First,the dielectric barrier discharge excitation LNG fuel test was carried out under different test conditions.Parameters such as electron temperature,plasma molecular vibration temperature and gas temperature were calculated by the Boltzmann slope method;The plasma electron density was calculated using the Stark broadening effect of the 696nm spectral line of ArI atom.The result shows that increasing the mixing volume flow ratio can effectively increase the dehydrogenation rate of methane.At the same time,it is found that the excitation effect of the dielectric barrier discharge on methane in the lean-burn state is better than that under the rich-burn condition.Secondly,the ignition test of LNG fuel was carried out using the three-dimensional rotating sliding arc discharge structure.Using a combination of emission spectroscopy+electrochemical method + high-speed photography,focused on these parameters including the physical form of combustion flame,flame emission spectrum,voltage and current characteristics and so on.The result shows that the gliding arc discharge excitation effect is the best only when the mixing volume flow ratio is 1:30,and both the flame spectrum intensity and flame temperature increase with the equivalence ratio.Finally,based on the mentioned above test data,a dual-mode discharge supporting combustion+ignition exciter was designed,and the dual-mode discharge excitation LNG combustion was initially explored.The excitation effect of dual-mode discharge and simple sliding arc discharge were compared,and the result shows that the dual-mode excitation effect is better than that of simple sliding arc discharge under lean-burn condition,while the excitation effect of the two is basically the same under rich-burn condition.