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Analysis and brief introduction for a foreign-designed centrifugal pump of double-volute |
YAN Jing, XIE Gong-die, ZHANG Jiang-yuan, KAN Neng-qi |
School of Energy and Enviornmental, Xihua University, Chengdu, Sichuan 610039, China |
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Abstract Double-volute is an important case form employed to balance radial thrust caused by centrifugal impellers under off-design operating conditions.However,very few reports are found to demonstrate its hydraulic performance and design principles.In this paper we analyze and describe the latest foreign data pertinent to double-volute.Based on extensive experimental results,the data present a more accurate empirical formula to evaluate radial thrust balancing effect between single volute and double-volute,and among different double-volute structures.We also show two approaches to determine outer sections of double-volute passage with the same flow rate: one is based on functions in foreign literatures;the other based on principle of conservation law of moment of momentum.
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Received: 08 August 2013
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