叶片空间型面造型对离心泵性能的影响研究

Effect of different blade surface profileson performance of centrifugal pump

为了研究叶片空间型面造型对离心泵外特性、内部流场的影响,以一台普通离心泵为研究模型,利用Cfturbo软件设计了两种相同设计参数,不同叶片型面造型的叶轮模型,采用标准k-ε湍流模型对两种模型叶轮离心泵内部流场进行单相定常数值模拟,并采用RNGk-ε湍流模型对两种叶轮模型离心泵空化性能进行数值模拟,得到内部流场特征、水力性能。并通过离心泵性能试验对数值模拟结果进行验证。研究结果表明:设计工况下,自由曲面叶片叶轮离心泵的扬程比倾斜直纹面叶片叶轮离心泵高0.45 m,NPSHR相同;通过优化倾斜直纹面叶片叶轮完全可以代替自由曲面叶片叶轮,降低企业的生产成本。

In order to research on effect of different Blade Surface Profiles on Performance and Flow field of centrifugal pump. A common centrifugal pump is analyzed. Two kinds of impeller models with the same design parameters and different Blade Surface Profiles were designed based on Cfturbo software. The standard k-ε turbulence model were applied to simulatecharacteristics and The RNGk-ε turbulence model,homogeneous multiphase model and Rayleigh-Plesset equation were applied to simulate cavitation characteristics of two centrifugal pump models. The flow field characteristics and the hydraulic performance were predicted and compared with experimental results. The result indicated that At the same flow rate,the centrifugal pump of the impeller of 3-D free surface blades was 0. 45 meter smaller than he centrifugal pump of the impeller of ruled surface blades and the same NPSHR. The impeller of the free-form blades can be replaced by optimizing the impeller of ruledsurface blades in order to reduce the cost of production.