为研究离散格式对离心泵性能预测精度的影响，本文以自吸式离心泵为计算模型，采用Realizable k-ε湍流模式进行三维内流场的数值模拟研究，分析了从零流量到最大工作流量下的内部流动和水力性能。建立了考虑内部间隙影响的自吸式离心泵全三维计算模型，分析了动量方程对流项采用一阶差分和二阶差分格式对计算精度的影响，同时分析了压力项的Standard和PRESTO离散格式对计算精度的影响。结果表明，在小流量工况下，采用二阶迎风格式具有较高的计算精度，而在大流量工况下采用一阶迎风格式更为合适。该结果可为准确预测离心泵全工况外特性提供参考依据。
A self-priming pump was adopted to research the effects of discrete scheme on performance prediction accuracy of the centrifugal pump. The Realizable k - s turbulent model was applied to simulate the three dimensional flow in a self-priming pump, and the pump performance from zero flow-rate to maximal flow-rate were analyzed. The three dimensional model considering seal clearance was set up, and then the effects of first-order differential and second-order differential scheme of convection item in the momentum equation on calculation precision were analyzed, as well as the Standard and PRESTO differential scheme of pressure item. The results show that the second-order differential scheme has higher accuracy for solving the small flow-rate condition of pump, and the first-order differential is more appropriate for large flow-rate condition. Such result provides reference for accurate perforraance prediction of a centrifugal pump in full operating condition.
参考文献
| [1] | 吕智君,兰才有,王福军.自吸泵研究现状及发展趋势[J].排灌机械,2005(03):1-5. |
| [2] | 郭晓梅,杨敏官,王春林.自吸泵现状分析[J].水泵技术,2002(01):27-29. |
| [3] | 李红,王涛.自吸泵内部流场的数值模拟及性能预测[J].排灌机械工程学报,2010(03):194-197. |
| [4] | 王春林,刘红光,司艳雷,吴志旺,易同祥.旋流自吸泵泵体结构参数的优化设计[J].农业工程学报,2009(11):146-151,封4. |
| [5] | 王春林,司艳雷,郑海霞,彭娜,赵佰通,张浩.旋流自吸泵内部流场的数值模拟[J].排灌机械,2008(02):31-35. |
| [6] | Weidong Zhou;Zhimei Zhao;T. S. Lee;S. H. Winoto .Investigation of Flow Through Centrifugal Pump Impellers Using Computational Fluid Dynamics[J].International Journal of Rotating Machinery,2003(1):49-61. |
| [7] | 邵春雷,顾伯勤,陈晔.离心泵内部非定常压力场的数值研究[J].农业工程学报,2009(01):75-80. |
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