摘要
锥形双向旋转泵效环由于泵送能力强,许用间隙大,近年在机械密封循环冷却系统中获得了广泛应用.为了充分了解该类锥形泵效环引起的流体流动规律,基于CFD软件,对锥形双向旋转泵效环和密封腔之间的三维不可压缩流场进行了数值模拟,得到了泵效环内部流场的压力分布、速度分布和空化现象,揭示了泵效环工作过程流体运动的规律,对泵效环的泵送能力进行预测,获得了其扬程-流量曲线,在流量为2~3 L/min时,扬程为4.0~2.5 m,并将其与文献的试验结果进行了对比.分析了不同结构参数对泵效环扬程-流量关系的影响.结果表明：叶片厚度、叶片数、密封腔间隙距离及叶片出口角度对泵效环的性能均有一定的影响.增加叶片厚度,扬程略有增加;增加叶片数,扬程增加明显;增加密封腔间隙,则扬程减少;增加叶片出口角,扬程有所增加.出口角从55°增加到80°,扬程增加约10%.
Owing to the strong pumping capability and large allowable gap,the bidirectional rotating conical pumping ring has been widely used in mechanical seal for cycle cooling system in recent years.In order to adequately understand the fluid flow induced by the pumping ring,the numerical simulation of the three-dimensional turbulent flow field of the pumping ring and the mechanical seal chamber was conducted by a CFD software.The pressure and velocity distributions were obtained and the cavitations volume fraction distribution was analyzed,which revealed the flow law of the pumped fluid by the pumping ring.The pumping capacity of pumping ring was predicted by numerical calculations,the relation of the head-flow rate has been obtained.The head is about 4.0-2.5m at the flow rate of 2-L/min,which is consistent with the experimental result in the literature.The influence of different structural parameters on the head-flow correlation was studied.The results show that the blade thickness,the number of vanes,the gap between the seal chamber and the pumping ring,and the exit angles affeet the performance of the pumping ring.The head slightly increases with the blade thickness,and distinctly increases with the numbers of the blade.The head decreases with gap increasing,and slightly increases with the blade exit angles.The head increases by about 10% when the exit angle increases from 55°to 80°.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2015年第4期327-332,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
昆明理工大学学科方向团队支持项目
关键词
锥形泵效环
机械密封
数值模拟
泵送能力
结构参数
conical pumping ring
mechanical seal
numerical simulation
pumping capacity
structure parameters
