Abstract
For a high-speed centrifugal pump, cavitation occurs easily. To equip a high-performance splitter-bladed inducer upstream of the pump is an effective method to suppress cavitation. In this paper, an external characteristics experiment of the high-speed centrifugal pump with a splitter-bladed inducer is carried out, and the corresponding numerical calculations are completed. The research shows that the results of the numerical calculation are credible. Numerical cavitation calculations under eight different tip clearance conditions are carried out. First, it is found that the tip clearance (TC) has a certain impact on the head of the centrifugal pump. When TC is in a small range, the clearance leakage is small, and the impact on the head of the pump is not so obvious, which can give the pump a higher performance. Second, it is found that TC has a certain influence on the static pressure distribution in the cascade passage of the splitter-bladed inducer. When TC is in a certain range, the increasement in TC will aggravate the cavitation at the suction surface of the long blades near the inlet. When it exceeds the certain range, it will cause cavitation at the outlet of the inducer. At last, it is found that the cavitation’s severity and position of the inducer are closely related to TC. TC affects the magnitude and position of vorticity in the inducer’s passage. In this paper the flow mechanism of TC is revealed, and its research results can provide theoretical basis and technical support for the design of the tip clearance of the inducers.
Highlights
With the development of industrial technology and the requirement of social production, pumps are applied in more and more fields, especially in aerospace fields
Song [9] studies the influence of tip clearance on the flow characteristics related to the performance, and the separation is suppressed by the tip leakage flow with the increasing tip clearance
Shen [10] analyzed the effects of varying tip clearance widths on tip flows dynamics, and found that a larger tip clearance width has greater effects on the main-stream characteristics, which is due to more energy being exchanged between tip flows and main flows
Summary
With the development of industrial technology and the requirement of social production, pumps are applied in more and more fields, especially in aerospace fields. The results showed that the increase in IGVFs could change the average viscosity and density of working medium and increased the leakage flow rate furtherly It can be seen from the above that TC is small, it can affect the minimum pressure of its vortex core and the related tip clearance vortex cavitation, and the generated. A high-speed centrifugal pump with the tip clearance flow of the splitter-bladed inducer is still limited, and there are fewer an inducer is taken as the research object. A splitter-bladed inducer with high performance is test results, the influence of different TC on the internal flow, hydraulic performance, and adopted in this research. Through the comparison of numerical calculation and test results, cavitation performance of the splitter-bladed inducer are analyzed to reveal its flow mechthe influence of different TC on the internal flow, hydraulic performance, and cavitation anism. The number of centrifugal impeller blades is 8, and its blades are designed into the simplest straight blade form to minimize the influence of complex flow of centrifugal impeller on the inducer
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