为探究旋芯喷嘴内部流动特性与雾化特性，采用VOF to DPM模型对其进行数值模拟研究，并运用动网格方法模拟旋芯转动工况。分析不同入射水压对喷嘴内流体流动与旋芯转速的影响，得到收缩段对流体轴向速度的提升效果，总结出旋芯转速与流体切向速度联动规律及喷嘴出口处湍流动能分布特性，应用实验结果分析喷嘴雾化性能。结果表明:VOF to DPM模型与动网格结合可精确捕捉到喷嘴内部流流体与旋芯之间的相互作用;内流体速度与压力呈线性正相关趋势，收缩段结构特性可使轴向速度平均提升为331。5％，相同压力变化旋芯转速与流体切向速度变化趋势一致，雾化特性随着压力增加发生变化，最远射程增加，喷嘴雾化角先减少后增大。
A Study on the Flow Characteristics and Atomization Performance of Rotating Core Nozzles
ITo investigate the internal flow characteristics and atomization performance of the rotary core nozzle,a VOF to DPM model was used for numerical simulation research,and the dynamic grid method was used to simulate the rotational working conditions of the rotary core.Analyze the influence of different pressures on fluid flow and core rotation speed inside the nozzle,obtain the law of increasing axial velocity of the fluid and the linkage characteristics between core rotation speed and tangential velocity of the fluid in the contraction section,as well as the distribution characteristics of turbulent flow energy at the nozzle outlet.Apply experimental results to analyze the atomization performance of the nozzle.The results show that the VOF to DPM model combined with dynamic mesh can accurately capture the interaction between the internal flow of the nozzle and the rotating core;The velocity of the internal fluid shows a linear positive correlation with pressure.The structural characteristics of the contraction section can increase the average axial velocity to 331.5％.The same pressure change results in a consistent trend between the rotational speed of the core and the tangential velocity of the fluid.The atomization characteristics change with the increase of pressure,with the farthest range increasing.The atomization angle of the nozzle first decreases and then increases,and the atomization degree of the nozzle deepens.
rotating core nozzleVOF to DPM modelspinning speedstructural characteristics
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