回流孔径对磁力驱动离心泵内部流动的影响分析

发布时间：2018-12-25 20:09

【摘要】：为研究回流孔径变化对磁力驱动离心泵内部流场及水力性能的影响,分别以6、8、10 mm等3种不同回流孔径的磁力驱动离心泵模型,通过定常、非定常以及流热耦合等数值计算与外特性试验相结合的方法,开展了回流孔径变化对磁力驱动离心泵外特性、内部流场、温度场以及压力脉动特性的影响规律研究。结果表明,(1)回流孔径的变化对磁力驱动离心泵的扬程、效率及泵内部流场的影响较小,其中随着回流孔径的增大,磁力驱动离心泵扬程及效率呈下降趋势;(2)回流孔径的变化对冷却循环流道内的流场、温度场以及压力脉动性能的影响较大,其中随着回流孔径的增大,冷却循环流场内的压力分布逐渐减小,湍动能分布呈增大的趋势,冷却循环流道的冷却效果逐渐变强,另外回流孔径变化对传播进入冷却循环流场的压力脉动强度影响较小,对冷却循环流场内的压力脉动衰减速度影响较大。综上可知,回流孔径变化对泵内流场的影响较小,对冷却循环流道内的流动特性影响较大。
[Abstract]:In order to study the influence of reflux aperture change on the flow field and hydraulic performance of magnetic driven centrifugal pump, three kinds of magnetic drive centrifugal pump models with different reflux apertures, such as 6? 8? 10 mm and 10 mm, were used to study the flow field and hydraulic performance of magnetic drive centrifugal pump. The influence of reflux aperture variation on the external characteristics, internal flow field, temperature field and pressure pulsation characteristics of magnetic driven centrifugal pump is studied by combining unsteady and fluid-heat coupling numerical calculation with external characteristic test. The results show that: (1) the change of reflux aperture has little effect on the head, efficiency and flow field of the magnetic drive centrifugal pump, among which the lift and efficiency of the magnetic drive centrifugal pump decrease with the increase of the reflux aperture; (2) the influence of the reflux aperture on the flow field, temperature field and pressure pulsation in the cooling circulation channel is great, and the pressure distribution in the cooling circulation flow field decreases with the increase of the reflux aperture. The distribution of turbulent kinetic energy tends to increase, the cooling effect of cooling cycle channel becomes stronger, and the change of reflux aperture has little effect on the pressure pulsation intensity propagating into the cooling cycle flow field. It has a great influence on the attenuation velocity of pressure pulsation in the cooling cycle flow field. It can be concluded that the change of reflux aperture has little effect on the flow field in the pump and has a great influence on the flow characteristics in the cooling circulation channel.
【作者单位】：三峡大学机械与动力学院水电机械设备设计与维护湖北省重点实验室;江苏大学流体机械工程技术研究中心;中国农业科学院农田灌溉研究所/河南省节水农业重点实验室;
【基金】：国家重点研发计划项目(2016YFC0400104) 公益性(农业)行业专项(201503125) 三峡大学人才专项经费项目(2016KJX03) 河南省节水农业重点实验室开放课题(FIRI2017-21-01) 宜昌市科技计划应用基础研究项目(A17-302-a09)
【分类号】：TH311

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