Methodology for calculating the actuation mechanism of a movable blade system in low-specific-speed centrifugal pumps
https://doi.org/10.25206/2588-0373-2025-9-3-57-63
EDN: MRQFSK
Abstract
The paper outlines the principal stages of a calculation methodology for the blade-rotation mechanism of a low-specific-speed centrifugal pump impeller. The primary objective of the proposed approach is to enhance the energy efficiency of the pumping unit. The study focuses on an impeller of the CMG M 12.5/80 pump (head H = 80 m, design flow Qопт = 12.5 m³/h).
In the first stage, the optimized geometry of the impeller’s flow passages is computed for nominal, increased and reduced flow rates. CFD results revealed that, as flow increases, the blade wrap angle must decrease while the exit angle must increase, with the leading edge remaining fixed. Based on this insight, an adaptive control strategy is adopted, prescribing a rotation angle for each blade that maximizes hydraulic efficiency at each operating point. A numerical experiment was conducted, varying the blade rotation angle at flows of 0.7 Qопт and 1.3 Qопт to derive the correlation between the blade position and the flow rate.
In the second stage, analytical expressions are derived considering the blade rotation angle to impeller outer diameter and blade exit angle, enabling construction of theoretical head curves for both fixed and adaptive blade configurations. Theoretical investigations corroborate the numerical findings. The calculation methodology has been developed for a spring-based blade actuation mechanism, for calculating the blade rotation mechanism, which is based on a spring element, and the force of which is determined by calculating the total hydraulic force acting on the blade from the working medium.
About the Authors
K. E. Denisov
National Research University “Moscow Power Engineering Institute”
Russian Federation
Russian Federation
DENISOV Konstantin Evgeneevich, Postgraduate, Junior Researcher of the Fluid Mechanics and Hydraulic Machines Department
Moscow, Krasnokazarmennaya St.,14, bld. 1, 111250
AuthorID (RSCI): 1160511
AuthorID (SCOPUS): 57195963101
A. K. Liamasov
National Research University “Moscow Power Engineering Institute”
Russian Federation
Russian Federation
LIAMASOV Aleksandr Konstantinovich, Candidate of Technical Sciences, Associate Professor of the Fluid Mechanics and Hydraulic Machines Department
Moscow, Krasnokazarmennaya St.,14, bld. 1, 111250
AuthorID (RSCI): 1108198
AuthorID (SCOPUS): 57226005873
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For citations:
Denisov K.E., Liamasov A.K. Methodology for calculating the actuation mechanism of a movable blade system in low-specific-speed centrifugal pumps. Omsk Scientific Bulletin. Series Aviation-Rocket and Power Engineering. 2025;9(3):57-63. (In Russ.) https://doi.org/10.25206/2588-0373-2025-9-3-57-63. EDN: MRQFSK
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