Rokytko K. Simulation of combustion processes in microflame burners with asymmetric fuel distribution

The thesis is devoted to the scientific and technical substantiation of the technology of fuel combustion in microjet type burners with asymmetric fuel distribution, oriented to operation at relatively large values of the excess air ratio (2,0 ≤α ≤ 4,0). A cycle of studies of the regularities of isothermal flow and mixture formation of fuel and oxidizer in the proposed burners has been carried out. The features of the influence of such factors as the length of the flap on the end surface of the flame stabilizer, the value of the total excess air coefficient and the geometric parameters of the fuel distribution system have been established. A comparative analysis of the regularities of the flow in the investigated burners under isothermal conditions and for reacting flows is carried out. It was found that the flow pattern in the compared situations differs significantly both in quantitative and qualitative terms. The regularities of the formation of the heat state of the combustion zone, the burnout of gaseous fuel and the formation of toxic components in the combustion products are revealed. The possibility of regulating the characteristics of the proposed burner devices by changing the ratio of the primary and secondary air flows, which is regulated by the corresponding ratio of the width of the channels near walls and width channel between stabilizers these devices, has been investigated. The rational values of this ratio have been determined, at which favorable values of the energy-ecological characteristics of the burners are realized. The analysis of the effects of the influence of the place of supply of secondary air into the flame on the characteristics of the investigated burners is carried out. The dependence of the main characteristics of the investigated burners on the parameter of the fuel distribution system L1, which determines the location of the gas supply holes relative to the breakaway edge of the flame stabilizer, has been established. General provisions for the organization of work processes in burners with asymmetric fuel distribution have been developed and the resulting effects associated with each of the formulated provisions have been determined. The research results were implemented in the NPK "Jet-niche technology" in the development of burners for industrial furnaces for various purposes.