【摘要】 金属加工喷雾冷却是将液体直接雾化,雾化的小液滴汽化时带走热量,从而降低刀具工作区的温度。影响喷雾降温关键的因素是雾滴粒径,雾滴粒径越小,其表面积越大,越易汽化,液体蒸发、汽化从而产生良好的冷却效果。建立了用于金属切削加工冷却的气动喷雾系统,利用PDA测试系统对喷嘴的雾化特性进行了试验研究,测量了在不同工况下的雾滴粒径及滴速信息。试验结果表明,喷嘴孔径及气动压力对雾化特性有着重要影响,在0.4 MPa气压和1.2 mm喷嘴孔径条件下喷雾系统可得到最佳的雾化效果,喷雾冷却作用集中体现在喷雾射流中心区域。更多还原

【Abstract】 In spray cooling for metal cutting,the liquid is directly atomized.With evaporation of the droplets the heat is taken away and the temperature of the cutting area is cooled.The key factor of the spraying is the droplet size.The smaller the droplet and the bigger its surface area,the evaporation happens more easily.The experimental study on an air atomizing spray by PDA is presented,and the spray characteristics such as droplet diameter and velocity are obtained.Experiment showed that the nozzle aperture and the air pressure have great influence on the spray characteristics.The optimum condition of the spray was investigated.spray characteristics;droplet diameter;droplet velocity;PDA更多还原