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CSME 2024/05
Volume 45 No.2
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115-127
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Research on Optimization of Structural Parameters of Plastic-Iined Pumps Based on Genetic Algorithm
Xu Fanga, Youmin Wanga, Na Lua, Qidi Kea and Binxue Xua
aSchool of Mechanical Engineering, Anhui Polytechnic University, Wuhu, Anhui 241000, China.
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Abstract:
Low efficiency and small cavitation margin have always been difficult problems for low specific speed pumps. Its impact on plastic-lined pumps is even greater. So in this study, a plastic-lined pump with a specific speed of 65 is used as the research object. PumpLinx was used to simulate the internal flow field of the plastic-lined pump. The internal velocity, pressure, and flow line distribution diagrams were obtained, which verified the reasonability of the overall structure of the model. However, low efficiency and serious cavitation are still problems. The orthogonal test was designed, which uses the impeller inlet diameter, outlet width, vane outlet angle, and vane number as the four factors of the experiment. The efficiency and cavitation were used as evaluation indexes, respectively obtaining the two sets of better structural parameter combinations. Besides, an objective function optimization mathematical model with minimum efficiency loss and cavitation margin of the plastic-lined pump was established. The results of the two sets of orthogonal tests were used as the constraints of the genetic algorithm. The impeller inlet diameter, outlet width, vane outlet angle, and number of vanes were further optimized. The results show that when the impeller inlet diameter is 100mm, the outlet width is 14mm, the vane outlet angle is 27°, and the number of vanes is 6. The efficiency of the plastic-lined pump was increased by 2.36% and the steam volume fraction was reduced by 0.151. The efficiency and cavitation were also significantly improved.
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Keywords: plastic-lined pump, fluid-solid coupling, structural optimization design, genetic algorithm.
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*Corresponding author; e-mail:
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©
2024
CSME , ISSN 0257-9731
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