Simulation of Stress-Strain State of the Vortex Burner’s Swirler

The technique and results of numerical simulation of the stress-strain state of the blades of the vortex burner swirler developed for the modernization of heating boilers are outlined. For the modernization of water-tube boilers, the design of the vortex burner was proposed. A feature of the proposed burner is the design of a swirl device (), which is a body with inwardly mounted two rows of opposing guide blades. This permits to increase the turbulence and twisting of the flow and, as a result, improves the combustion process, and also considerably extends the range of geometry regulation and flame parameters. The purpose of swirlers numerical simulation is to check the structure reliability under the influence of hydrodynamic forces during operation. The study of the oscillations of the vortex burner blades makes it possible to determine the places with the greatest equivalent stresses, and, consequently, the most probable foci of failure, the place of change in the operating conditions of safe operation. The mathematical formulation of the problem is formulated; the method of modeling with the help of the finite element method is described. To carry out the simulation, specialized computer programs were used. A solid model of a vortex burner was developed. The solid model is divided into two modeling elements, external and internal. The surfaces on which the loads and surfaces are in relative rest were determined. The loads on the vortex blades were determined from the empirical relationships given in the specialized literature. The analysis of the mechanisms and regularities of damage to the blades, residual stress fields was carried out. The quantitative estimates of the reliability parameters of vortex blades obtained as a result of modeling are presented. Analysis of the diagrams made it possible to determine the zones (on the surfaces of the blades) in which maximum forces and displacements are observed. The results of the design check showed sufficient design reliability for accident-free operation, for all faces of the model, the safety factor is greater than 1.