小流量工况叶片数对多相混输泵增压性能的影响

The Effect of Blade Numbers on the Pressurization Performance of a Multiphase Pump under the Low Flow Rate Condition

叶轮叶片数是多相混输泵设计的重要参数,同时与泵的性能密切相关。为了研究叶片数对多相混输泵增压性能的影响,以自主研发的多相混输泵为研究对象,使用Geometry软件改变叶轮叶片数。基于标准的k-ε湍流模型,选用Fluent软件来对小流量工况下叶片数分别为3,4和5的多相泵内流动特征进行数值计算,总结不同叶片数对其内部压力分布和增压性能的影响规律。研究发现:在叶片压力面,当叶片数为4时,叶片进口低压区面积最少、压力变化均匀,同时对介质增压效果较好。因此,综合比较发现当叶片数等于4时的混输泵增压性能最好。

The number of impeller blades is an important parameter in the design of multiphase pump and is closely related to the performance of the pump.In order to investigate the effect of blade numbers on the pressurization performance of the self-developed multiphase pump,the Geometry software is used to change impeller blades.Based on the standard k-εturbulence model,the Fluent software is selected to simulate flow characteristics in a multiphase pump with the different impeller blades(Z=3,4,and 5)under the low flow rate condition.The effect of blade numbers on pressure distribution and pressurization performance is summarized.The results show that when the impeller blade is 4,the low-pressure region at the blade inlet is the smallest and the pressure variation is uniform.Meanwhile,the pressure pressurization on the medium is better.Therefore,it is found that when the impeller blade is 4,the pressurization performance of the pump is the best.