基于Bezier曲线的低比转速离心泵叶片包角优选  

The optimization of blade envelope angle of low specific speed centrifugal pump based on Bezier curve

作　　者：刘宇 冯进[1] 迟少林 李裴晨 何臻 黄新宇 陈维 Liu Yu;Feng Jin;Chi Shaolin;Li Peichen;He Zhen;Huang Xinyu;Chen Wei(School of Mechanical Engineering, Yangtze University,Jingzhou 434023,Hubei)

机构地区：[1]长江大学机械工程学院

出　　处：《长江大学学报（自然科学版）》2019年第8期65-70,I0005,共7页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目(61572084)

摘　　要：叶轮作为离心泵最关键的部件,其设计优劣直接影响离心泵的性能。为研究低比转速离心泵叶片包角的优选问题,在保证叶轮其他基本参数不变的前提下,建立10~170°共7个不同包角的叶片模型,采用五点四次Bezier样条曲线绘制叶片型线,通过CFD(计算流体动力学)仿真得到了7个模型的预测性能曲线。研究发现,随叶片包角增大,低比转速离心泵扬程下降,功率降低,效率先增加后降低,存在极值,在叶片包角为120°附近时性能最优;在叶片包角较小时,叶轮内流道产生涡旋,导致功率消耗增加,效率降低;叶片包角较大时,流道扩散低,但流道较长,导致水力损失增加,效率降低。As the impeller is the most critical component of centrifugal pump,its designing affects the performance of centrifugal pumpdirectly. To study the optimization of blade wrap angle of low specific speed centrifugal pump,on the premise of keeping other basic parameters of impeller unchanged,seven blade models with different wrap angles of 10~170 are established. To draw the blade profile,the fivepoints and four times Bezier curve is used. The predictive performance curves of seven models are obtained by CFD simulation. It is found that there is an extreme value on efficiency, the head and power of centrifugal pump with low specific speed decreases,but its efficiency increases first and then decreases with the increase of the blade wrap angle. The performance is best when the blade wrap angle is 120 degrees. When the blade wrap angle is small, the inner passage of the impeller produces vortices,which leads to the increase of power consumption and the decrease of efficiency. When the blade wrap angle is large,the passage diffusion is low,but the passage is long,which leads to the increase of hydraulic loss and the decrease of efficiency.

关 键 词：BEZIER曲线 低比转速离心泵 叶片包角 优选 

分 类 号：TH311[机械工程—机械制造及自动化]