Experimental evidence of cavitation influences on the positive slope on the pump performance curve of a low specific speed model pump-turbine
Experimental evidence of cavitation influences on the positive slope on the pump performance curve of a low specific speed model pump-turbine
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空化对低比转速模型水泵水轮机泵性能曲线正斜率影响的实验证据
DOI：
10.1016/j.renene.2017.06.099
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发表时间：
2017-12
期刊：
影响因子：
8.7
通讯作者：
Shuhong Liu
中科院分区：
文献类型：
--
作者：
Guocheng Lu;Zhigang Zuo;Yuekun Sun;Demin Liu;Yoshinobu Tsujimoto;Shuhong Liu
水泵-水轮机的泵性能曲线上的正斜率表明在泵模式下潜在的运行不稳定。前人的研究表明，空化条件可以影响正向边坡失稳，但具体的影响还不是很清楚。本文首次对低比转数模型水泵-水轮机进行了系统的实验研究。结果表明，导叶大开度处的正斜率随空化系数的减小而减小，而中等开口处的空化对正斜率的影响不大。随着空化系数的减小，小开口流量系数较大时出现正斜率。压力波动的FFT(快速傅立叶变换)结果表明，在转轮和导叶之间的无叶间隙附近发生了旋转失速。空化系数的变化对旋转失速的发生有较大影响，但旋转失速引起的压力波动频率变化不大。推测空化系数对旋转失速的影响可能是正斜率区域变化的原因。
The positive slope on the pump performance curve of pump-turbines suggests potential operational instabilities in pump mode. Previous research has indicated that the positive slope instability can be affected by cavitation conditions, however the detailed influences remain poorly understood. A low specific speed model pump-turbine was systematically examined by experiments for the first time in the present study. A new finding was made that the positive slope is alleviated at the large guide vane opening with decreasing cavitation coefficient, while there is little influence by cavitation at the medium opening. The positive slope occurs at larger discharge coefficient at the small opening when the cavitation coefficient decreases. FFT (Fast Fourier Transformation) results of pressure fluctuations revealed the occurrence of rotating stall close to the vaneless space between the runner and the guide vanes. The variation of cavitation coefficient influences greatly on the occurrence of rotating stall, but the pressure fluctuation frequency caused by rotating stall does not vary significantly. It is postulated that the influence of cavitation coefficient on the rotating stall may be responsible for the variation of the positive slope region.
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DOI：
10.5075/epfl-thesis-4422
发表时间：
2009
期刊：
--
影响因子：
--
作者：
O. Braun
通讯作者：
O. Braun
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DOI：
10.1016/j.compfluid.2012.08.001
发表时间：
2012-09
期刊：
COMPUTERS & FLUIDS
影响因子：
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DOI：
10.1088/1757-899x/72/3/032016
发表时间：
2015-01
期刊：
IOP Conference Series: Materials Science and Engineering
影响因子：
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作者：
D. M. Liu;Y. Z. Zhao;X. B. Liu;Y. Ma;W. Wang
通讯作者：
D. M. Liu;Y. Z. Zhao;X. B. Liu;Y. Ma;W. Wang
影响因子：
2.1
作者：
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通讯作者：
Yuekun Sun;Z. Zuo;Shuhong Liu;Jintao Liu;Yulin Wu
水轮机工况下水泵水轮机性能曲线的S形特征——综述
影响因子：
15.9
作者：
Zhigang Zuo;Honggang Fan;Shuhong Liu;Yulin Wu
通讯作者：
Yulin Wu