Study Of The Performance Of Plasma Ignition

It is crucial to ignite fuel reliably in combustor of gas turbine when it starts to work. It not only play very important role in the reliability of power devices, but also has to do with security of aircraft and watercraft when they are sailing. Plasma ignition for engine is a new pattern of portfire, which is widely applied in many fields, such as aviation, power station, natural gas transportation, petroleum industry. Plasma ignition has a special discharge characteristic and great discharge energy to improve the reliability of retrofires and increase the concentration limit of retrofires. So many researchers are paying attention to this technology.There are several basic conservation equations and many mathematic models which have been applied in this paper, such as RNG k-εtwo equations turbulence model, simplified reaction system model, diffusion model and Discrete phase model. The surface of electrodes coupled with adjacent flow to exam affect of temperature from convection and conduction. In order to reduce number of grids, the application of hybrid grids is helpful to discrete the regions of geometry model which are not predigest the structure of technics. The total numbers of grids are more than 2,420,000. The conservation equations are discreted by hybrid scheme and SIMPLE algorithum method deal with equations.There are two groups of data have been disposed to exam variety of parameters in the outlet, such as the average flow temperature, average flow velocity and average mixture fraction of products. These parameters represent total ignition energy of plasma ignition device. Acording to data of stimulation, average flow temperature in the outlet is apt to rise withαincreasing. It is helpful to promote flow internal energy of outlet; it also leads to average flow velocity of outlet increasing. This phenomenon is helpful to enhance rigidity of flame, but average mixture fraction of products will reduce, which causes reduction of chemistry energy which is play an important role in total ignition energy. The length of jet flame is shorten becase of concentration of fuel in the axes of jet flame are reduced. According to analysis from the data of stimulation, studying out the related curves which maybe helpful to design and improve the plasma ignition.There are also some important conclusions about the variety of anode surfaces temperature with a increasing. Firstly, the highest anode surfaces temperature are located in 40 mm away from the inlet of fuel. The affect of highest temperature in anode surfaces is minor, but it exerts great influence on afterbody of anode surfaces and the area of high temperature will be largen at this situation. So it is better apply for minor a parameter to control the area of high temperature and the highest anode surfaces temperature, and lengthen jet flame and pomoted time limit of maintaince.