摘要
以150WX-200-20型旋流泵为研究对象,分析了输送化工废液时旋流泵内循环流与贯通流的压力梯度和速度梯度变化.研究结果表明随着黏度增大,旋流泵扬程降低,轴功率增大,效率下降.同时内流结构也随之改变,循环流在轴向方向被压缩,大量流体堆积在后缩腔内,降低了旋流泵的效率.对旋流泵内循环流与贯通流进行量化分析,在压力梯度与速度梯度2个方面分析最佳效率点.黏度的改变使贯通流速度梯度走向改变,从先增大后减小变为先减小后增大,对循环流而言,最大速度梯度与最小速度梯度之差在黏度不高于0.10 Pa·s时越大,效率越高,高于0.10 Pa·s时越小,效率越高.研究结论对旋流泵在化工领域应用具有重要的参考价值和指导意义.
Taking 150 WX-200-20 vortex pump as the research object, the change of pressure gradient and velocity gradient of the circulating and through flow in the vortex pump when transporting chemical waste liquid was analyzed, and the influence of viscosity on its internal flow structure was explored. The research results show that as the viscosity increases, the head of the vortex pump decreases, the shaft power increases, and the efficiency decreases. At the same time, the internal flow structure also changes. The circulating flow is compressed in the axial direction. A large amount of fluid accumulates in the retracting cavity, which reduces the efficiency of the vortex pump. The circulation flow and through flow in the vortex pump are quantified, and the best efficiency point in terms of pressure gradient and velocity gradient is analyzed. The change of viscosity changes the direction of the through flow velocity gradient, from first increase and then decrease to first decrease and then increase. For the circulating flow, the greater the difference between the maximum velocity gradient and the mini-mum velocity gradient when the viscosity is not higher than 0.10 Pa·s, the higher the efficiency, and when the viscosity is higher than 0.10 Pa·s, the smaller the difference, the higher the efficiency. This conclusion has important reference value and significantly guides the application of vortex pump in the chemical field.
作者
权辉
于欣洋
李雅楠
宋凯
浦海燕
王卫华
QUAN Hui;YU Xinyang;LI Yanan;SONG Kai;PU Haiyan;WANG Weihua(College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;Jiangsu Shuangda Pump Industry Co.Ltd.,Jingjiang,Jiangsu 225300,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2021年第12期1278-1283,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51969014,51609113)
中国博士后科学基金资助项目(2018M633651XB)
甘肃省杰出青年基金资助项目(20JR10RA204)
甘肃省自然科学基金资助项目(20JR5RA456)
兰州理工大学红柳优秀青年基金项目。
关键词
旋流泵
化工废液
数值模拟
循环流
贯通流
vortex pump
chemical waste liquids
numerical simulation
circulation flow
through flow
