泵作透平专用叶轮直径的确定及其对透平性能的影响

为了以理论方法建立前弯叶片泵作透平专用叶轮直径与设计流量的关系,揭示叶轮直径对透平性能的影响,该文以比转速为66的离心泵为原型,推导叶轮直径与设计流量的关系表达式。在不改变原型泵其他过流部件的前提下,基于ANSYS Bladegen软件设计3个进口安放角均为90°,直径分别为235、245和255 mm的前弯叶片透平专用叶轮。在试验验证基础上,分别完成3台透平全流场数值计算。结果表明：叶轮直径对透平外特性有显著影响,高效点随叶轮直径增加向大流量偏移。最高效率点均出现在计算临界流量稍偏右侧,与理论推导结论基本相符。叶轮直径从235 mm增大到245和255 mm时,透平最高效率分别提高了1.73...

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Bibliographic Details
Published in农业工程学报 Vol. 32; no. 15; pp. 60 - 66
Main Author 王桃 孔繁余 杨孙圣 陈凯 苟秋琴
Format Journal Article
LanguageChinese
Published 西华大学能源与动力工程学院,成都610039%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 2016
江苏大学流体机械工程技术研究中心,镇江212013
Subjects
前弯叶片
叶轮
模型
泵
离心泵作透平
蜗壳常数
速度矩
models
impellers
volute constant
centrifugal pump as turbine
离心泵作透平
模型
前弯叶片
速度矩
pumps
velocity moment
叶轮
泵
蜗壳常数
forward curved blade
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2016.15.009

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Summary:为了以理论方法建立前弯叶片泵作透平专用叶轮直径与设计流量的关系,揭示叶轮直径对透平性能的影响,该文以比转速为66的离心泵为原型,推导叶轮直径与设计流量的关系表达式。在不改变原型泵其他过流部件的前提下,基于ANSYS Bladegen软件设计3个进口安放角均为90°,直径分别为235、245和255 mm的前弯叶片透平专用叶轮。在试验验证基础上,分别完成3台透平全流场数值计算。结果表明：叶轮直径对透平外特性有显著影响,高效点随叶轮直径增加向大流量偏移。最高效率点均出现在计算临界流量稍偏右侧,与理论推导结论基本相符。叶轮直径从235 mm增大到245和255 mm时,透平最高效率分别提高了1.73%和3.32%。随叶轮直径增大,小流量区效率下降且降速快,大流量区效率提高且高效区宽。该研究丰富了液力透平设计方法,可为前弯叶片透平专用叶轮设计提供参考。
Bibliography:A reverse running centrifugal pump is one of the attractive choices in micro-hydropower development and industrial pressure energy recovery.One of the main problems in utilizing pump as turbine（PAT） is that the performance of PAT is usually not ideal due to the impeller with the routine backward curved blades which do not match well with turbine running condition.A cost effective way for solving this problem is to redesign impeller with forward curved blades from turbine working condition while the other components do not undergo any modifications.Impeller diameter is one of the main factors in impeller design.Therefore,research on the relationship of diameter and design flow rate and the influence of impeller diameter on PAT＇ s performance is useful.In this paper,based on the constant velocity moment theory,calculation expression of volute constant within spiral volute was first developed and the velocity moment before impeller was acquired.Next,a relationship between impeller diameter and the critical desig
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2016.15.009