转速对离心泵作透平性能影响的试验与分析

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...

Full description

Saved in:
Bibliographic Details
Published in农业工程学报 Vol. 32; no. 15; pp. 67 - 74
Main Author 王桃 孔繁余 陈凯 段小辉 苟秋琴
Format Journal Article
LanguageChinese
Published 西华大学能源与动力工程学院,成都610039 2016
江苏大学流体机械工程技术研究中心,镇江212013%江苏大学流体机械工程技术研究中心,镇江,212013%西华大学流体及动力机械教育部重点实验室,成都,610039
Subjects
外特性试验
离心泵
经济运行
计算机仿真
转速
透平
转速
turbines
透平
离心泵
computer simulation
经济运行
economic operation
外特性试验
centrifugal pumps
计算机仿真
rotational speed
performance experiment
Online AccessGet full text
ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2016.15.010

Cover

More Information
Summary: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。
Bibliography:11-2047/S
centrifugal pumps; turbines; computer simulation; rotational speed; performance experiment; economic operation
Wang Tao,Kong Fanyu,Chen Kai,Duan Xiaohui,Gou Qiuqin （ 1. School of Energy and Power Engineering, Xihua University, Chengdu 610039, China; 2. Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China; 3. Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China）
A reverse running centrifugal pump is one of the most convenient choices with lower cost in microhydropower development and industrial pressure energy recovery. One of the main limitations in utilizing pump as turbine（PAT） technique is that the PAT usually runs at part load for several months in a year due to insufficient water availability for the power production. Variable speed operation offers an effective solution to this problem. Pump manufactures normally do not provide performance curves of pump running in turbine mode, especially
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2016.15.010