基于微量润滑磨削的双喷口喷嘴雾化仿真分析

摘要

为了减小磨削时砂轮表面气障层的影响，提高磨削液润滑和冷却的效果，设计了一种双喷口结构的喷嘴。分析了微量润滑雾化机理，采用二级雾化理论建立了雾化数学模型，对双喷口喷嘴的雾化过程进行了仿真分析，并对仿真结果进行了验证。研究结果表明：双喷口喷嘴能有效减小雾滴直径，提高磨削液的雾化效果；辅助喷口雾滴可以扰乱砂轮表面的空气环流，减小气障层对主喷口雾滴流向的影响，促使主喷口喷出的雾滴能顺利进入磨削区。%In order to reduce the impacts of gas barrier,a double-spout nozzle was proposed.The atomization mechanism of MQL was analyzed,and the mathematical model was established by two-stage atomization model.The atomization process of the double-spout nozzle was simulated to analyses the atomization properties,and experiments were carried out to verify the simulation.The results show that the structure of the double-spout can effectively decrease the diameter of droplets and im-prove the atomization performance.The droplets sprayed by the assistant j et can break the air barrier layer and reduce the effect of the gas barrier layer on droplet flow.Therefore,the droplets from the main j et can enter the grinding zone easily.