基于CFD技术的部分流泵几何参数对其性能的影响研究

Research on the Relationship between Geometric Parameters and Performance for the Partial Emission Pumps Based on CFD Technology

根据叶片泵基本方程,推导出考虑叶片滑移时叶轮外径及叶片数与部分流泵扬程的关系式,并对部分流泵进行水力设计。首先建立部分流泵的三维模型,再利用CFD技术,基于RANS方程,采用标准k-ε湍流模型,对其内部三维流动进行数值模拟。模拟结果显示,部分流泵随着叶轮外径从279 mm到287 mm变化,其扬程和效率都有所增大,但增大的幅度较小;当叶轮外径从287 mm到289 mm变化时,其效率出现下降。部分流泵静压分布均匀合理;改变叶轮的叶片数,随着叶片数从8、10、12变化,部分流泵的扬程和效率也相应增加。通过数值试验,模拟结果与理论推导相符。

The relationship between the impeller diameter,the blade number and the head of partial emission pump was obtained on the basis of the fundamental equation of rotodynamic pump.With the enhancement of the impeller diameter and the blade number,the head increased.The hydraulic design of the partial emission pump was carried out,seven impeller and three blade number was selected,and a three dimensional model was established.Numerical simulation and performance prediction was conducted with the standard k-ε turbulence model based on the RANS equation.The results showed the head and efficiency grew up a little when the impeller diameter inclined from 279 mm to 287 mm,and the efficiency would drop when the impeller diameter was 289mm.The static pressure was well-distributed in the pump;with the increase of the blade number,the head and efficiency would rise.The numerical solution had good agreement with the theory derivation.