叶片数与叶片厚度协同设计对离心泵性能的影响研究

Research on the Influence of Cooperative Design of Blade Number and Blade Thickness on the Characteristics of the Centrifugal Pump

为了研究叶片数与叶片厚度的协同设计对离心泵叶轮性能的影响,采用k-Epsilon湍流模型在ANSYS CFX商用软件中,分别对3种叶片数和3种叶片厚度协同设计的9种模型在0.8Qd、1.0Qd、1.2Qd三种流量下进行定常和非定常的数值模拟,分析了各组方案的外特性曲线、内部流场及叶轮流道压力脉动特性。研究结果表明:协同方案中适当的同时增加叶片数并减小叶片厚度能增加离心泵效率,提高叶轮截面液体流速分布的均匀性,降低叶轮流道处压力脉动;在各协同方案中,叶片数对各流量下叶轮截面静压力和小流量下湍动能区域面积大小起主导作用,最大静压力值和静压力分布均匀性随着叶片数的增加而增加。

In order to study the effect of the collaborative design of the number of blades and the thickness of the blades on the performance of the centrifugal pump impeller,the k-Epsilon turbulence model is used in the ANSYS CFX commercial software,the steady-state and unsteady numerical simulations of the nine models with three kinds of blade numbers and three kinds of blade thickness co-designed at 0.8Qd,1.0Qd and 1.2Qd flow rates respectively.The external characteristic curve,internal flow field and pressure pulsation characteristics of the impeller flow path of each group scheme are analyzed.Research indicates that properly increasing the number of blades and reducing the thickness of the blades in the synergistic scheme can increase the efficiency of the centrifugal pump,improve the uniformity of the liquid velocity distribution of the impeller cross section,and reduce the pressure pulsation at the impeller flow path.In each collaborative scheme,the number of blades plays a leading role in the static pressure of the impeller cross section at each flow rate and the area of the turbulent kinetic energy area at small flow rates.The maximum static pressure value and the uniformity of static pressure distribution increase with the number of blades.