Experimental and numerical investigations of head-flow curve instability of a single-stage centrifugal pump with volute casing
Experimental and numerical investigations of head-flow curve instability of a single-stage centrifugal pump with volute casing
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蜗壳单级离心泵水头流量曲线不稳定性的实验与数值研究
DOI：
10.1177/0957650916663326
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发表时间：
2016-08
期刊：
影响因子：
--
通讯作者：
陈小平
中科院分区：
文献类型：
--
作者：
李晓俊;朱祖超;李昳;陈小平
不稳定或平坦的水头流量曲线会在并联操作或平坦系统中引起问题。尽管人们对蜗壳单级离心泵扬程流量曲线不稳定性的研究做了大量的工作，但对这种现象产生的原因还没有充分的了解。在这项研究中，我们研究了水力损失的变化的基础上的速度分布和熵产场之间的关系。对叶轮出口直径为174 mm的离心泵进行了定常和非定常数值模拟，非定常计算结果与实验结果吻合较好。结果表明，在高流量工况下，损失主要集中在叶片吸力面和蜗壳舌部以及蜗壳出流区域。部分流量下泵壳的熵产率随流量的减小而略有变化，而当流量降至35 m3/h（设计流量为60 m3/h）时，叶轮中的能量损失急剧增加。叶轮内的损失主要集中在进口和出口附近区域，进口附近的损失小于出口附近的损失，在出口附近的叶片尾缘附近形成了一个反向旋转的旋涡。涡的存在使压力面和流道内的熵产率急剧增加。这种增加是水头特性不稳定的主要原因。
Unstable or flat head-flow curves can cause problems in parallel operations or in flat systems. Despite the considerable efforts that have been devoted to the study of head-flow curve instability in single-stage centrifugal pumps with volute casing, the cause of such phenomenon is not sufficiently understood. In this study, we investigated the variation of hydraulic losses based on the relationship between velocity distribution and entropy generation fields. Steady-state and unsteady simulations were obtained for a pump with an impeller outlet diameter of 174 mm, and the unsteady results are more coincided with the experiments. Results showed that the losses mainly focused on the blade suction surface and volute tongue, as well as in the region of the volute discharge at high flow rates. The entropy generation rate of the pump casing at partial flow rates changed slightly with a decrease in flow rate, whereas the energy losses in the impeller increased steeply when the flow rate dropped to 35 m3/h (the design flow rate was 60 m3/h). The losses in the impeller were mainly concentrated on the region near the inlet and outlet and were lower near the impeller inlet than near the impeller outlet, where a counter-rotating vortex was developed near the blade trailing edge. The vortex caused a drastic increase in the entropy generation rate on the pressure surface and in the flow passage. Such increase was the main cause of the head-flow characteristic instability.
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DOI：
10.5293/ijfms.2009.2.1.031
发表时间：
2009-03
影响因子：
--
作者：
Masahiro Miyabe;A. Furukawa;H. Maeda;Isamu Umeki;Y. Jittani
通讯作者：
Masahiro Miyabe;A. Furukawa;H. Maeda;Isamu Umeki;Y. Jittani
影响因子：
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作者：
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通讯作者：
H. Stel;G. Amaral;C. Negrao;S. Chiva;V. Estevam;R. Morales
影响因子：
1.6
作者：
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通讯作者：
C. Son;H. Jin;M. Kim;W. Chung
影响因子：
1.7
作者：
Alemi, Hamed;Nourbakhsh, Seyyed Ahmad;Najafi, Amir Farhad
通讯作者：
Najafi, Amir Farhad
DOI：
10.1177/0957650914563364
发表时间：
2015-05
期刊：
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
影响因子：
--
作者：
G. Cavazzini;G. Pavesi;A. Santolin;G. Ardizzon;R. Lorenzi
通讯作者：
G. Cavazzini;G. Pavesi;A. Santolin;G. Ardizzon;R. Lorenzi