摘要
在低比转速离心泵的设计过程中,叶片厚度对叶轮性能的影响很少被考虑。在运用速度系数法设计叶轮时,也只是将叶片厚度的影响放在排挤系数的因数中参与扬程计算,没有从根本上研究叶片厚度与低比转速离心泵叶轮性能的关系。本研究运用数值模拟方法对叶片出口厚度δ2=5、10和15 mm 3种方案进行分析,计算工况范围取(0.2-1.4)Qd。结果显示:出口处叶片厚度增加会改变叶轮出口处喉部条件,对流道内的流动情况产生影响;叶片厚度增加会使扬程和效率有所提高,同时轴功率也随之增加。
In the design process of a low specific rotating speed centrifugal pump,the influence of the blade thickness on the performance of an impeller is scarcely taken into account. When the velocity coefficient method is used to design an impeller,the influence of the blade thickness will be only placed in the factors of the extrusion coefficient to take part in the lift calculation,thus having not radically studied the relationship between the blade thickness and the performance of the impeller in a low specific rotating speed centrifugal pump. A numerical calculation method was used to conduct a numerical analysis of three versions: the thicknesses at the trailing edge of the blade are δ2= 5mm,δ2= 10 mm and δ2= 15 mm respectively and the operating conditions calculated ranged from 0. 2 Qdto 1. 4Qd. It has been found that to increase the thickness at the trailing edge of the blade may change the operating conditions at the throat at the outlet of the impeller,thus influencing the flow conditions in the flow passages. The external characteristic curves show that to increase the blade thickness can force the lift and efficiency to somewhat increase and in the meantime,the shaft power will increase accordingly. Through an analysis of the three versions,the authors learned more about the law governing the influence of the blade thickness on the external characteristics of the low specific rotating speed centrifugal pump,therefore,offering reference for rationally controlling blade thicknesses in design.
出处
《热能动力工程》
CAS
CSCD
北大核心
2015年第3期442-446,498,共5页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(51279172)
四川省教育厅重大培育项目(14CZ0013)
西华大学流体及动力机械教育部重点实验室开放基金资助项目(szjj2014-039)
西华大学研究生创新基金资助项目(ycjj2014168)
关键词
低比转速离心泵
叶片厚度
离心叶轮
性能预测
low specific rotating speed centrifugal pump,blade thickness,centrifugal impeller,performance prediction
