| 王超，朱波.离心泵叶轮半圆形切割方法[J].轻工机械,2015,33(1): |
| 离心泵叶轮半圆形切割方法 |
| Research of Semicircular Cutting Method in Centrifugal Pump |
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| DOI：IO. 3969/j. issn. 1005 -2895. 2015. 01. 007 |
| 中文关键词: 离心泵 叶轮 半圆形切割 数值模拟 切割方法 特性曲线 |
| 英文关键词:centrifugal pump impeller semicircular cutting numerical simulation cutting methods performance curve |
| 基金项目: |
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| 中文摘要: |
| 针对现有的传统叶轮切割方法的不足，提出了一种叶轮特殊切割方法——半圆形叶轮切割方法，利用CFD数值
模拟的方法，对多工况不同尺寸半圆形切割方案下的泵模型开展相关研究。结果表明，这种半圆形的叶轮特殊切割方法
可以改善泵外特性曲线，消除驼峰，还可以显著地提升泵的扬程性能指标；半圆形切割方案的最佳切割直径d为叶轮出
口宽度h，的0.4倍；此外，通过对流场流动特性的分析得出，半圆形叶轮切割方法之所以有显著效果，是因为切割后叶轮
出口及蜗壳处的压力梯度和速度梯度较低，速度和压力分布要比模型泵内的分布更均匀，使得泵内混合冲击损失变小。 |
| 英文摘要: |
| Aiming at the shortage of conventional impeller cutting methods. a new unconventional impeller cutting
method named semicircular cutting was presented and pump models modified by different unconventional impeller cutting
scheme were studied based on CFD numerical simulation and experimental investigation. The result indicates that
semicircular cutting can remove H-Q instability and improve pump head effectively. The optimum semicircular size is
given out for reference. The flow field analysis shows that after cutting pressure and velocity gradient at the impeller
outlet and volute are both smaller than that in model pump. The uniformity of flow is increased and impact loss is
reduced. which presents the significant effect of the semicircular cutting method. |
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