【摘要】 采用M IXTURE双相流数值模拟的方法研究压力涡流喷嘴结构因素对形成中空锥喷雾的影响。喷孔直径由0.5 mm增大到1 mm时,喷雾贯穿距离减少约6000/,空心锥角增大7.5倍;喷孔长度由0.6 mm增大到1 mm时,喷雾贯穿距离增大约1.4倍,空心锥角减少约4000/;有轴针时,空心锥角增加约4倍;改变轴针形状,将轴针头部加工成锥形,空心锥角增加约3000/。喷孔内、外有无圆角对喷雾空心锥角大小的影响幅度在3000/~4000/。研究结果表明:喷孔长径比、喷孔入口处喷孔形状与轴针形状的配合和喷孔出口端形状是影响压力涡流喷嘴空心锥特性的重要因素。更多还原

【Abstract】 The influence of structure factor of pressurized-swirl injector nozzle on hollow cone spray was studied by using MIXTURE dual phase flow numeric simulation method.When the nozzle diameter increases from 0.5 mm to 1 mm,the spray penetration distance decreases by 600/0 and the hollow spray cone angle increases by 7.5 times.When nozzle length increases from 0.6 mm to 1 mm,the spray penetration distance increases by 1.4 times and the hollow spray cone angle decreases by 400/0.The hollow spray cone angle increases by 4 times by using the injector with axis needle and modification of needle configuration,such as processing the needle head into cone shape,can also increase the hollow spray cone angle by 300/0.The variety scope of the hollow spray cone is about 300/0~400/0 for there is a fillet at the nozzle entrance and the nozzle exit or not.The study shows that the factors such as ratio of injector nozzle length to diameter,coordination of shape of nozzle and needle at the nozzle entrance,nozzle shape at nozzle exit are the important factors that influence the spray characteristic of pressurized-swirl injector.更多还原