Characteristics of transition process of increasing axial flow pump's blade angle
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Abstract:
The geometric model of vertical axial flow pump with siphon outlet channel and the 3D unsteady numerical simulation method of blade angle adjusting process was developed, whiledy namic grid and grid reconstruction method was adopted to realize the blades rotation wit h the impeller in the compound movement. Three adjusting rules were selected for numerical simulation too btain the changing rules of relevant working parameters and internal flow field changes. The results showed that: the flow rate increased by 4.4% ~ 4.9% , and the impeller torque increased by 5.1% ~ 5.9% , when the blade angle was increased by 2°at three different times; the static pressure fluctuation range of the impeller inlet and outlet plane was found large; during the process, the flow pattern in the impeller region deteriorated, vortex cores were distributed in the impeller region and there were low-pressure regions with uneven distribution on the blade suction surface; when the opening time was adjusted 1 second, the fluctuation range of static pressure at the impellercs inlet and outlet plane and impeller torque and the distribution of vortex core in the impeller region was larger than the other two working conditions, therefore, increasing the blade angle in a short time will increase the instability of the impeller area.
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