A general alternate loading technique and its applications in the inverse designs of centrifugal and mixed-flow pump impellers
For the inverse designs of centrifugal and mixed-flow pump impellers, clarifying the generation process of secondary flows and putting forward corresponding suppression measures is an important approach to improve the impeller performance. In this paper, to provide a better qualitative insight into...
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Published in | Science China. Technological sciences Vol. 64; no. 4; pp. 898 - 918 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
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Beijing
Science China Press
01.04.2021
Springer Nature B.V |
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Abstract | For the inverse designs of centrifugal and mixed-flow pump impellers, clarifying the generation process of secondary flows and putting forward corresponding suppression measures is an important approach to improve the impeller performance. In this paper, to provide a better qualitative insight into the generation mechanism of secondary flows in the impeller, a simple kinematic equation is derived based on the ideal assumptions, which indicates that the potential rothalpy gradient (PRG) is the most important dynamic source that actively induces secondary vortical flows. Induced by the natural adverse PRG on the S1 and S2 stream surfaces, two typical secondary flows,
H
-
S
and
P
-
S
secondary flows, are clearly presented. To specially suppress these typical secondary flows, a general alternate loading technique (GALT) is proposed, aiming to adjust the real blade loading
δp
to control the PRG features. At the blade fore part, the
δp
on the hub streamline should be slowly increased to avoid breakneck growth of the potential rothalpy to reduce adverse streamwise PRG on the S2 streamsurface. At the blade middle part, the
δp
should be moderately decreased to reduce adverse streamwise PRG on the S1 streamsurface. At the blade aft part, the difference in the
δp
between the shroud and hub streamlines should be decreased faster to control the exit uniformity. By applying the GALT to the impeller designs of three typical pump types in hydraulic engineering, the organizational effect of the PRG on fundamental flow structures is proven. The GALT can effectively control the PRG distributions and suppress the secondary flows, thereby widening the pump’s high-efficiency zone, improving flow uniformity and suppressing pressure fluctuations. Compared with the current Z-G method and the ALT, the GALT can meet the requirements of “de-experience” better, thereby enabling the designers to obtain good products explicitly and quickly. |
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AbstractList | For the inverse designs of centrifugal and mixed-flow pump impellers, clarifying the generation process of secondary flows and putting forward corresponding suppression measures is an important approach to improve the impeller performance. In this paper, to provide a better qualitative insight into the generation mechanism of secondary flows in the impeller, a simple kinematic equation is derived based on the ideal assumptions, which indicates that the potential rothalpy gradient (PRG) is the most important dynamic source that actively induces secondary vortical flows. Induced by the natural adverse PRG on the S1 and S2 stream surfaces, two typical secondary flows, H-S and P-S secondary flows, are clearly presented. To specially suppress these typical secondary flows, a general alternate loading technique (GALT) is proposed, aiming to adjust the real blade loading δp to control the PRG features. At the blade fore part, the δp on the hub streamline should be slowly increased to avoid breakneck growth of the potential rothalpy to reduce adverse streamwise PRG on the S2 streamsurface. At the blade middle part, the δp should be moderately decreased to reduce adverse streamwise PRG on the S1 streamsurface. At the blade aft part, the difference in the δp between the shroud and hub streamlines should be decreased faster to control the exit uniformity. By applying the GALT to the impeller designs of three typical pump types in hydraulic engineering, the organizational effect of the PRG on fundamental flow structures is proven. The GALT can effectively control the PRG distributions and suppress the secondary flows, thereby widening the pump’s high-efficiency zone, improving flow uniformity and suppressing pressure fluctuations. Compared with the current Z-G method and the ALT, the GALT can meet the requirements of “de-experience” better, thereby enabling the designers to obtain good products explicitly and quickly. For the inverse designs of centrifugal and mixed-flow pump impellers, clarifying the generation process of secondary flows and putting forward corresponding suppression measures is an important approach to improve the impeller performance. In this paper, to provide a better qualitative insight into the generation mechanism of secondary flows in the impeller, a simple kinematic equation is derived based on the ideal assumptions, which indicates that the potential rothalpy gradient (PRG) is the most important dynamic source that actively induces secondary vortical flows. Induced by the natural adverse PRG on the S1 and S2 stream surfaces, two typical secondary flows, H - S and P - S secondary flows, are clearly presented. To specially suppress these typical secondary flows, a general alternate loading technique (GALT) is proposed, aiming to adjust the real blade loading δp to control the PRG features. At the blade fore part, the δp on the hub streamline should be slowly increased to avoid breakneck growth of the potential rothalpy to reduce adverse streamwise PRG on the S2 streamsurface. At the blade middle part, the δp should be moderately decreased to reduce adverse streamwise PRG on the S1 streamsurface. At the blade aft part, the difference in the δp between the shroud and hub streamlines should be decreased faster to control the exit uniformity. By applying the GALT to the impeller designs of three typical pump types in hydraulic engineering, the organizational effect of the PRG on fundamental flow structures is proven. The GALT can effectively control the PRG distributions and suppress the secondary flows, thereby widening the pump’s high-efficiency zone, improving flow uniformity and suppressing pressure fluctuations. Compared with the current Z-G method and the ALT, the GALT can meet the requirements of “de-experience” better, thereby enabling the designers to obtain good products explicitly and quickly. |
Author | Yao, ZhiFeng Wang, FuJun He, ChengLian Wang, ChaoYue Xiao, RuoFu Zou, ZhiChao An, DongSen Lu, Li |
Author_xml | – sequence: 1 givenname: ChaoYue surname: Wang fullname: Wang, ChaoYue organization: College of Water Resources and Civil Engineering, China Agricultural University – sequence: 2 givenname: FuJun surname: Wang fullname: Wang, FuJun email: wangfj@cau.edu.cn organization: College of Water Resources and Civil Engineering, China Agricultural University, Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System – sequence: 3 givenname: DongSen surname: An fullname: An, DongSen organization: College of Water Resources and Civil Engineering, China Agricultural University – sequence: 4 givenname: ZhiFeng surname: Yao fullname: Yao, ZhiFeng organization: College of Water Resources and Civil Engineering, China Agricultural University, Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System – sequence: 5 givenname: RuoFu surname: Xiao fullname: Xiao, RuoFu organization: College of Water Resources and Civil Engineering, China Agricultural University, Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System – sequence: 6 givenname: Li surname: Lu fullname: Lu, Li organization: Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System, China Institute of Water Resources and Hydropower Research – sequence: 7 givenname: ChengLian surname: He fullname: He, ChengLian organization: China Water Resources Beifang Investigation, Design and Research Co. Ltd – sequence: 8 givenname: ZhiChao surname: Zou fullname: Zou, ZhiChao organization: China Institute of Water Resources and Hydropower Research |
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Keywords | alternate loading technique potential rothalpy gradient mixed-flow pump centrifugal pump inverse design impeller |
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Snippet | For the inverse designs of centrifugal and mixed-flow pump impellers, clarifying the generation process of secondary flows and putting forward corresponding... |
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SubjectTerms | Centrifugal pumps Design Engineering Hydraulic engineering Impellers Kinematic equations Pump impellers Secondary flow |
Title | A general alternate loading technique and its applications in the inverse designs of centrifugal and mixed-flow pump impellers |
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