Optimization Of Atomizing Core Structure And Atomizing Performance Of New Snowmaking Machine Nozzle

With the success of the 2022 Winter Olympics in Beijing,the demand for artificial snow has increased dramatically at snow sports venues and training venues.In order to improve the performance and efficiency of snow making machine and meet the requirements of quality and stability of artificial snow making.In this paper,the structure parameters and operation parameters of nozzle atomizing core of a new type of snow maker are optimized.Simulation and experimental research on nozzle atomization and snow-making performance,to obtain a new type of snow-making machine nozzle with better atomization characteristics and snow-making performance,which is of great significance to the improvement of snow quality of artificial snow-making.Based on the theory of computational fluid dynamics,basic control equations are established and turbulence models,two-phase flow models and discrete-phase models are selected for numerical simulation.To study the atomized droplets,a mathematical model of droplet motion and fragmentation is developed.Improving a supersonic two-fluid snow-making machine nozzle atomization core structure based on the principle of supersonic atomization and Laval nozzle.In order to improve the quality of artificial snow,the running parameters of the new nozzle and the structure parameters of atomizing core were optimized.The internal and external fields of the nozzle are modeled,and the mesh is divided.Finally,the mesh is imported into the simulation software for solving.Three types of throat structures,rectangular,circular and conical,are selected for simulation and optimization of their internal axial and exit radial velocities.The results show that the internal axial velocity and the exit radial velocity are maximum when the structure of the atomization core throat is rectangular;Simulation of the velocity field distribution pattern of the internal and external flow fields of the nozzle under different operating parameters,and use the discrete phase model to numerically analyze the influence trend of its droplet particle size,and study the change of gas and liquid pressure and the change of droplet particle size law;Numerical simulations were used to analyze the distribution of the average diameter of droplet sot,the number of droplets on the centerline and the axial velocity of different structures of atomizing cores,and to study the effects of changes in the structural parameters of atomizing cores on the atomization performance of nozzles.Optimization of different structural parameters of the nozzle atomization core and different operating parameters of the nozzle of the new snow-making machine using orthogonal tests and deriving the optimal combination.In order to study the atomization performance of the nozzle,the spray range test and droplet velocity test were conducted on the nozzle before and after optimization.Compare the simulation results of the optimized nozzle speed with the experimental results to verify the accuracy and feasibility of the simulation.In order to study the snow-making performance of the nozzles,snow-making tests were conducted on the nozzles before and after optimization,and the density of artificial snow-making was measured and compared.The experimental results prove that the snow-making quality of the nozzle after structure optimization is better than that of the nozzle before structure optimization.