泵反转液力透平速度滑移的计算与分析
发布时间：2019-03-17 13:38
【摘要】：针对离心泵反转液力透平(PAT),采用RNGk-ε湍流数值模拟分析了泵工况(正转)与透平工况(反转)的速度滑移特性,揭示了滑移系数的变化规律,提出了考虑滑移系数时计算PAT泵工况与透平工况扬程换算关系的新方法.结果表明:随着流量增加,泵工况滑移系数增大,透平工况滑移系数减小.速度滑移引起叶轮内的附加水力损失,透平工况流量大于额定流量时,其滑移系数小,叶轮内附加水力损失小,这是液力透平大流量时效率高的原因之一.采用PAT换算关系新方法计算了不同比转速下的6个PAT算例的扬程换算值,并将结果与未考虑滑移系数的方法比较,经实验验证该方法的平均误差约减小5%~20%.
[Abstract]:In this paper, the velocity slip characteristics of centrifugal pump reverse hydraulic turbine (PAT), are analyzed by RNGk- 蔚 turbulence simulation, and the variation rule of slip coefficient is revealed. A new method for calculating the conversion relationship between the lift of PAT pump and turbine is presented when the slip coefficient is taken into account. The results show that with the increase of flow rate, the slip coefficient of pump working condition increases and the slip coefficient of turbine condition decreases. The speed slip causes the additional hydraulic loss in the impeller. When the turbine flow rate is larger than the rated flow rate, the slip coefficient is small and the additional hydraulic loss in the impeller is small. This is one of the reasons for the high efficiency of hydraulic turbine with large flow rate. The new method of PAT conversion relation is used to calculate the head conversion values of six PAT examples at different specific speeds. The results are compared with those of the method without consideration of slip coefficient. The average error of this method is reduced by about 5% ~ 20% by experiments.
【作者单位】： 兰州理工大学能源与动力工程学院;兰州理工大学甘肃省流体机械及系统重点实验室;
【基金】：国家自然科学基金资助项目(51569013)
【分类号】：TH311
本文编号：2442355
[Abstract]:In this paper, the velocity slip characteristics of centrifugal pump reverse hydraulic turbine (PAT), are analyzed by RNGk- 蔚 turbulence simulation, and the variation rule of slip coefficient is revealed. A new method for calculating the conversion relationship between the lift of PAT pump and turbine is presented when the slip coefficient is taken into account. The results show that with the increase of flow rate, the slip coefficient of pump working condition increases and the slip coefficient of turbine condition decreases. The speed slip causes the additional hydraulic loss in the impeller. When the turbine flow rate is larger than the rated flow rate, the slip coefficient is small and the additional hydraulic loss in the impeller is small. This is one of the reasons for the high efficiency of hydraulic turbine with large flow rate. The new method of PAT conversion relation is used to calculate the head conversion values of six PAT examples at different specific speeds. The results are compared with those of the method without consideration of slip coefficient. The average error of this method is reduced by about 5% ~ 20% by experiments.
【作者单位】： 兰州理工大学能源与动力工程学院;兰州理工大学甘肃省流体机械及系统重点实验室;
【基金】：国家自然科学基金资助项目(51569013)
【分类号】：TH311
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