离心泵作液力透平叶轮出口滑移系数的解析计算方法及验证

为了通过理论的方法准确预测液力透平的性能，该文分析了叶轮内部相对环流流动的特征，提出了3种计算离心泵反转作液力透平叶轮出口滑移系数的方法，得到了相应的叶轮出口滑移系数解析计算公式，然后采用10组离心泵反转作液力透平的试验数据对所提出的滑移系数计算公式进行验证，最后得出与试验结果较为吻合的解析公式。结果表明：当假设叶片工作面上的相对涡诱导速度与叶轮出口边上的相对涡诱导速度的比值等于叶片和涡心所张曲边三角形的面积与叶轮出口边和涡心所张曲边三角形的面积之比时，得到的液力透平叶轮出口滑移系数的计算公式最准确，可用于较准确地预测液力透平的性能。在计算液力透平叶轮内的滑移时只需计算叶轮出口的滑移。该研究结...

Full description

Saved in:
Bibliographic Details
Published in农业工程学报 Vol. 31; no. 11; pp. 66 - 73
Main Author 史广泰 杨军虎 苗森春
Format Journal Article
LanguageChinese
Published 西华大学能源与动力工程学院,成都,610039%兰州理工大学能源与动力工程学院,兰州,730050 2015
Subjects
叶轮
泵
泵作透平
滑移系数
理论水头
相对涡
速度
pump as turbine
理论水头
impellers
滑移系数
slip factor
泵作透平
相对涡
pumps
velocity
relative eddy
叶轮
theoretical head
泵
速度
Online AccessGet full text
ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2015.11.010

Cover

More Information
Summary:为了通过理论的方法准确预测液力透平的性能，该文分析了叶轮内部相对环流流动的特征，提出了3种计算离心泵反转作液力透平叶轮出口滑移系数的方法，得到了相应的叶轮出口滑移系数解析计算公式，然后采用10组离心泵反转作液力透平的试验数据对所提出的滑移系数计算公式进行验证，最后得出与试验结果较为吻合的解析公式。结果表明：当假设叶片工作面上的相对涡诱导速度与叶轮出口边上的相对涡诱导速度的比值等于叶片和涡心所张曲边三角形的面积与叶轮出口边和涡心所张曲边三角形的面积之比时，得到的液力透平叶轮出口滑移系数的计算公式最准确，可用于较准确地预测液力透平的性能。在计算液力透平叶轮内的滑移时只需计算叶轮出口的滑移。该研究结果为更加精确地通过理论方法预测液力透平的性能提供了参考。
Bibliography:pumps;impellers;velocity;slip factor;pump as turbine;theoretical head;relative eddy
11-2047/S
A centrifugal pump can be operated in its reverse rotational direction as a turbine-a prime motor, and its impeller is a kind of centripetal impeller. It can convert the high pressure energy of a fluid into the rotational mechanical energy of the rotor to drive a generator to generate electricity or drive a working machine, realizing an energy recycling of the high pressure fluid. It is well-known that the slip phenomenon exists in turbomachinery, such as hydraulic turbine, steam turbine, roto-dynamic pumps and compressors. This is also true for a centrifugal pump as turbine. The slip velocity may be smaller in a hydraulic turbine than a centrifugal pump. However, this is not the case for a centrifugal pump as turbine because its number of blades is much less compared with the hydraulic turbine. The constraint ability of blade is less for fluid giving rise a smaller slip factor. In addition, a slip factor is the key pa
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2015.11.010