气液同轴旋流式喷嘴喷雾特性实验研究

An experimental study was carried out on a gas-liquid coaxial swirl nozzle with softened water as the working fluid. Firstly, the macroscopic atomization characteristics were analyzed, and the variation of spray flow rate and atomization cone angle with water supply pressure and air supply pressure was discussed. Then, the characteristics of secondary atomization particles are analyzed, and the distribution of particle size distribution and droplet velocity is discussed. The results show that the nozzle flow rate increases with the increase of water pressure, and the pressure change of the gas path does not significantly affect the nozzle flow rate. With the increase of gas supply pressure, the atomization cone angle begins to shrink. When the gas pressure is constant, the atomization liquid cone expands outward with the increase of water supply pressure. When the water supply pressure reaches a certain value, the atomization cone angle increases slowly with the increase of water supply pressure. After a certain distance from the nozzle outlet, the spray is broken into secondary atomized particles. The distribution of particle size in the radial direction is bimodal distribution. The droplet velocity at the axial position of 50 mm is in a three-peak distribution in the radial direction, and the droplet velocity at the axial position of 100 mm gradually increases along the radial direction.