期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：304
期号：2
页码：1-7
DOI：10.1088/1755-1315/304/2/022003
出版社：IOP Publishing
摘要：Normally in pump-storage power plant, spherical valve is installed in the terminal of penstock. Spherical valve is used to block the water flow or involving in regulation guarantee. The stability of spherical valve is of great importance for safe operation of pump-storage power plant and unit. In this literature, two kinds of implementation for spherical valve hydrodynamic closure method were discussed, and comparisons of methods were made. On the emphasis of safety, method of shut-down unit was employed for the case pump-storage power unit. For data achieved in hydrodynamic closure with rated load, characteristic analysis of time domain and spectrum analysis of frequency domain were used. The research indicates that on the guide vane failure with load the spherical valve can effectively block water passing passage and the spherical valve displacement meets the requirement of safe running. The maximum pressure pulsation and vibration happens at the spherical valve opening of 34%. Many frequencies occurred in the pressure and vibration signals, including frequencies of rotational stall and rotor stator interference frequency. Considering on the severe vibration of spherical valve, it is recommended that the spherical valve should not involve in the regulation guarantee so as to keep the power plant safety.
