| With the improvement of living standards, more and more families buy a car. Car to provide convenient transportation at the same time also brought a lot of air pollution, the use of fossil fuels for internal combustion engine, his burning is not sufficient, emissions into the air formed an exhaust gas, which is obviously and contrary to the concept of sustainable human development. Therefore, better make full combustion of fuel is an urgent problem to be resolved in the internal combustion engine cylinder.Compared to conventional spark ignition arc plasma, plasma has a high density, high activity and low temperature many excellent characteristics. As a new type of microwave ignition mode in indoor research, improve the lean burn convenience has a great role in promoting. This paper relying on in "inside the cylinder to increase fuel reduction waste electric spark chain microwave discharge mechanism of the Anhui Province Natural Science Fund project, by building a simulation of microwave discharge plasma in cylindrical resonant cavity combustion experimental platform, and then carry out on in cylinder increase fuel reduction of waste electric spark chain microwave discharge mechanism.Based on the research data and the related concepts of plasma ignition and microwave research status at home and abroad, discharge are summarized. This thesis intends to research methods used, magnetic resonance coupling discharge method, with high-speed photography on ignition and combustion process of dynamic testing, combined with the in cylinder pressure testing, component of the exhaust detection and plasma combustion simulation and Study on spark chain microwave flow injection SWD improve combustion efficiency and reduce exhaust to the physical and chemical mechanisms are introduced.Our research group on the basis of existing research, builds a cylinder by burning waste reduction electric spark discharge mechanism of microwave chain on this platform. The use of cylindrical cavity instead of a gasoline engine cylinder, by adjusting the microwave generator to generate plasma, and then to ignite the methane gas mixture CH4. Using public settings in the cavity of the cylindrical cavity with a variety of sensors, collecting different initial pressure, empty burning power inferior vena in gas pressure data curve ratio, different microwave input. At the same time, utilizing high speed camera fuel combustion of images.Through the analysis of the data, it is found that the initial pressure of methane CH4 gas mixtures in 0.1-0.3mph range can produce relatively large area microwave plasma, helpful to microwave ignition; on the contrary initial pressure is large, microwave ignition performance decreased significantly. At the same time, the data analysis and to take photos show that under the same pressure, the size of the microwave input power also plays a decisive role, the input microwave power is greater, resulting in the microwave plasma area is larger, the effect of combustion, the better; below 400W power input rate, with microwave plasma ignition and traditional spark ignition produced the effect is almost the same. But from the collection to emissions samples analysis, under the same external conditions, microwave ignition combustion emissions in the exhaust gas CO, CO2 and NOx content than the traditional ignition exhaust emissions in the same substantive content are low. This research can serve as a scientific basis for the application of internal combustion engine microwave ignition technology in energy saving and emission reduction.In order to better explore the characteristics of microwave ignition, this paper analyzed and explored the possibility of the combustion path of methane CH4 mixed as under the effect of microwave power supply. To test platform built-in this paper establishes simulation model, and using COMSOL metaphysics software of microwave ignition combustion system in electron density, and electron temperature simulation and to further study the evolutionary mechanism of the microwave ignition. |
PDF Full Text Request