双层三窄叶旋桨搅拌槽内流场特性研究
Study of Flow Field Characteristics in a Stirred Tank Equipped with a Double Triple Narrow Blade Rotating Impeller
高晓斌 1包健 2郭海锋 1肖志鹏 1周勇军1
作者信息
- 1. 南京工业大学机械与动力工程学院,江苏南京 211816
- 2. 江苏省特种设备安全监督检验研究院国家化工设备质量监督检验中心,江苏苏州 215600
- 折叠
摘要
以甘油-水溶液为流动介质,采用计算流体动力学和粒子图像测速技术相结合的方法,针对双层三窄叶旋桨搅拌槽,研究了旋桨参数离底距C1、桨间距C2 及转速N对槽内流场特性的影响.结果表明,随着C1 的增大,下层桨叶的推动作用先增强后减弱,在C1=0.25h(h为槽内液位高度)时槽底流体混合状态最佳.在C2=0.24h时,上层旋桨影响区域形成高速涡旋,槽内两层旋桨桨叶间的流体流动状态最佳.在N=120 r/min时,槽内流体的湍动能及流速分布均较均匀,能耗较低.
Abstract
For a stirred tank equipped with double triple narrow blade rotating impellers under the conditions of glycerol-water solution as a flowing medium,combining computational fluid dynamics method and particle image velocimetry technology as a method,the effects of impeller parameters,including impeller installation height C1,impeller pitch C2 and rotational speed N on the internal flow field in the tank were studied.The re-sults show that when C1=0.25h(symbol h represents the liquid level in the tank),the pushing effect of the im-peller on the internal flow field in the tank was investigated.The results show that when C1=0.25h,the pushing effect of the lower blade first increases and then decreases with the addition of C1,the mixing state of the bot-tom liquid in the stirred tank is the most optimal.When C2=0.24h,the upper propeller area forms a high-speed vortex,the fluid flow between blades in the tank and the two blades cooperate is the best.When N=120 r/min,both the turbulent kinetic energy and the velocity distribution in the tank are relatively uniform,and the ener-gy consumption is lower.
关键词
搅拌槽/流场/特性/旋桨/参数/影响Key words
stirred tank/flow field/characteristics/rotating impeller/parameter/effect引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据