转速对离心泵作透平性能影响的试验与分析

被引：10

作者：

王桃 ^{[1
,2
]}

孔繁余 ^{[2
]}

陈凯 ^{[2
]}

段小辉 ^{[2
]}

苟秋琴 ^{[3
]}

机构：

[1] 西华大学能源与动力工程学院

[2] 江苏大学流体机械工程技术研究中心

[3] 西华大学流体及动力机械教育部重点实验室

来源：

农业工程学报 | 2016年 / 32卷 / 15期

关键词：

离心泵; 透平; 计算机仿真; 转速; 外特性试验; 经济运行;

D O I：

暂无

中图分类号：

TH311 [离心泵];

学科分类号：

080704 ;

摘要：

为揭示转速对泵作透平效率的影响规律,该文以一比转速为66,叶轮采用透平专用叶轮的离心泵反转作透平为对象,完成了900到2 100 r/min间隔300 r/min,共5个不同转速运行试验与数值模拟。结果表明:不同转速下,透平扬程与轴功率均随流量增大而增加,效率曲线先上升后下降。CFD计算值与运用比例定律理论计算值较吻合,但CFD不能完全客观反映变速对效率的影响。试验性能参数与运用比例定律理论计算值存在一定偏差,流量偏差最小,扬程偏差其次,轴功率偏差最大。额定转速运行时,试验最高效率为69.83%;降20%与40%转速运行时,效率较额定转速时分别下降了2.82%与6.34%。分析表明,降速对容积与机械效率呈负影响,而一定范围内升速对效率呈非线性正向影响。透平部分工况运行时,偏离额定工况越远,效率下降越明显,降速运行对提高效率效果越显著。在水力条件及强度均满足的前提下,透平尽量维持或略高于额定转速运行,有利于能源的高效利用。研究结果对透平高效经济运行具有参考价值。

引用

页码：67 / 74

页数：8

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