不同转速时贯流泵装置出水流道水力性能分析

发布时间：2018-03-13 09:33

本文选题：贯流泵　切入点：出水流道　出处：《水动力学研究与进展(A辑)》2017年06期 　论文类型：期刊论文

【摘要】：为了研究不同转速时贯流泵装置出水流道水力性能的变化规律,采用CFD(computational fluid dynamics)方法对贯流泵装置进行全流道三维数值计算,分析了不同转速时出水流道水力损失及平均速度环量的变化规律,以及不同转速时出水流道内流场及进出口断面速度分布的变化规律,该文对比了物理模型试验与数值预测结果的差异性。结果表明:随流量系数的增加,出水流道进口的平均速度环量先减小后增大。在相同流量系数时,随转速的降低出水流道进口的平均速度环量逐渐减小。不同转速时出水流道进口的平均速度环量数值均不相同,出水流道的水力损失未与流量的二次方成线性关系。相同流量系数时,随转速的增加,出水流道的水力损失逐渐增大。转速通过改变出水流道进口平均速度环量的大小影响出水流道的内部流态,不同转速时贯流泵装置出水流道的内流场已不满足运动相似。
[Abstract]:In order to study the variation rule of hydraulic performance of outlet passage of tubular pump unit at different rotational speeds, CFD(computational fluid dynamicsmethod was used to carry out the three-dimensional numerical calculation of the flow channel of the through-flow pump device. The variation law of hydraulic loss and average velocity loop of outlet passage at different speeds, and the variation of flow field in outlet channel and velocity distribution of inlet and outlet section at different speeds are analyzed. The difference between the physical model test and the numerical prediction results is compared. The results show that with the increase of the flow coefficient, the average velocity loop at the inlet of the outlet channel decreases first and then increases. With the decrease of speed, the average velocity loop at the inlet of outlet channel decreases gradually, and the value of the average velocity loop at the inlet of outlet channel is different at different speeds. The hydraulic loss of the outlet passage is not linear with the quadratic power of discharge. When the flow coefficient is the same, with the increase of rotational speed, The hydraulic loss of outlet channel increases gradually, and the internal flow pattern of outlet passage is affected by changing the average velocity loop of outlet inlet at different speeds, and the internal flow field of outlet passage of tubular pump device is not satisfied with the motion similarity at different speeds.
【作者单位】：扬州大学水利与能源动力工程学院;江苏省水利动力工程重点实验室;
【基金】：国家自然科学基金项目(51609210) 江苏省自然科学基金项目(BK20150457,BK20160469) 中国博士后科学基金项目(2016M591932)~~
【分类号】：TV136.2

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