Theoretical Simulation And Experimental Study Of The Discharge Device Of Microwave Plasma Ignition And Assisted Combustion

The low-temperature non-equilibrium plasma can be produced by microwave discharge, it has many excellent properties, such as activity, large electron density, high ionization degree and wide operating pressure range. It has a very broad application prospect in the ignition and combustion of scramjet operating. Among the key technologies of scramjet, combustor technology is one of the most difficulties. Because the airflow in scramjet combustor is supersonic flow, it is very difficult to achieve mixing, ignition and steady combustion of fuel. In view of this, we proposed the idea that applies microwave discharge plasma to the scramjet operating.This paper for the topic of microwave discharge plasma ignition and assisted combustion, started from the microwave plasma ignition and assisted combustion mechanism analysis, conducted a simulation study on discharge chamber under different structural parameters. Simultaneously, an experimental scheme was designed and performed with microwave discharge plasma ignition and assisted combustion based on the simulation optimization results. Finally, the different experimental solutions were analyzed phenomenon, draw the corresponding conclusions. The main contents are as follows:(1) Based on the theory of microwave discharge plasma ignition and assisted combustion, the basic characteristics of microwave discharge were discussed, the working principle of the microwave plasma generator was analyzed, the working mechanism of microwave discharge plasma ignition and assisted combustion was explored, the relevant plasma diagnostic methods were described, the theoretical foundation for the subsequent simulation and experimental study was put forward.(2) Reference to the international development status of microwave discharge plasma ignition and assisted combustion, based on the basic principle of microwave discharge plasma, an experimental platform was set up. The experimental system includes the basic components: microwave source model MZY1500S, the microwave frequency is2.45GHz, working gas is argon, microwave successively through circulator, tuning monitoring system, three pins regulator, standards waveguide, tapered and rectangular gradient waveguide to the plasma discharge chamber.(3) Based on Ansoft HFSS to simulate the discharge chamber under different structural parameters, the electric field strength distribution of the quartz tube and inside the rectangular waveguide under various conditions was calculated, the optimization work of the key factors affecting the discharge efficiency was completed.(4) Based on the experimental platform of microwave discharge plasma ignition and assisted combustion, reference to the optimization of the experimental structure design, the experimental studies of microwave discharge plasma ignition and assisted combustion were conducted. The impact of microwave power, the flow rate of working gas, a quartz tube and four quartz tubes on the discharge were exported. Finally, the experimental data was analyzed and the corresponding conclusions were drew.