On high efficiency operation of contra-rotating axial flow pump with rotational speed control toward effective energy saving

Cao, Linlin; Watanabe, Satoshi; Imanishi, Toshiki; Momosaki, S; Furukawa, Akinori

doi:10.1088/1755-1315/15/4/042027

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…The bidirectional operation mode of tidal units can provide relatively continuous power, with strong adaptability to the power grid, and can operate at peak loads. Due to the higher efficiency, compact structure, stable performance curve, and great anti-cavitation performance of the counter-rotating unit [5], the application of counter-rotating technology in tidal power plants is expected to effectively improve the performance of the unit and provide more potential energy for the next step of power generation, while fully leveraging the advantages of power generation.…”

Section: Introductionmentioning

confidence: 99%

Research on Two-Way Contra-Rotating Axial-Flow Pump–Turbine with Various Blade Angles in Pump Mode

Chen

Zhang

et al. 2023

Processes

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In tidal two-way contra-rotating units, significant differences in performance often occur when arranging the front and rear impellers, which requires an optimized design of the impellers. To solve this problem, by reducing the blade inlet and outlet angles, the impact of different blade angles on the performance of two-way pump–turbines and the internal flow was explored, and the effects of the blade inlet angle of the impellers on the performance of the counter-rotating pump were obtained. Afterward, the streamline and vorticity of the two-stage impeller at different angles were analyzed. The results show that different blade angles will have a certain impact on the internal flow of the two-way pump–turbine. Different blade outlet angles have a significant impact. The variation in different inlet blade angles is not significant for the vorticity changes in the front impeller and rear impeller. In addition, changes in the outlet blade angle will have an impact on the location of LE impact water of the rear impeller, which in turn affects the contours of vorticity of the rear impeller near LE, which also means that the vorticity in this area is mainly dominated by the vortex stretching term.

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Section: Introductionmentioning

confidence: 99%

Research on Two-Way Contra-Rotating Axial-Flow Pump–Turbine with Various Blade Angles in Pump Mode

Chen

Zhang

et al. 2023

Processes

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“…Many scholars have shown that compared with traditional single-rotor pumps with the same design parameters (flow, head, specific speed, etc. ), the counter-rotating pump has higher efficiency, more compact structure, more stable performance curve and better cavitation resistance (Wang et al, 2010;Cao et al, 2012). Counter-rotating axial flow turbines have been widely used in various industrial fields such as propellers, axial flow pumps and low-speed fans (Shinpei et al, 2010;Furukawa et al, 2007;Cao et al, 2013;Shigemitsu et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Optimization of Two-Way Counter-rotating Axial Flow Pump Turbine

Wang

Lin

et al. 2020

Front. Energy Res.

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The two-way counter-rotation technology is mainly applied to the tidal power station. In this paper, the hydrodynamic optimization of the two-way counter-rotating axial-flow pump turbine is carried out. Under the premise of realizing the forward and reverse power generation and the forward and negative pumping basic function, it has important engineering significance and academic value for improving the pump turbine performance of various working conditions. The main contents are as follows: hydraulic design of “S”-shaped blade for the two-way counter-rotating axial-flow pump turbine is conducted, and the influence of the gap between different impeller stages on the performance is calculated and analyzed, and the variation law of head and efficiency of the pump turbine under different inter-stage clearances is obtained. And the influence of the inter-stage gap on the unit is summarized from the vorticity distribution and the axial section pressure cloud diagram analysis, and the range of the best inter-stage gap of the unit performance is determined.

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“…Yet, the cavitation performance of the pump under various rotational speeds is rarely researched, especially for the pumps with an inducer. Cao et al [17][18][19] proposed a prediction method of pump characteristics under the condition of optimized rotational speed control. Wu et al [20] proposed that rotational speed is the main parameter in the designing and using of full metal screw pump.…”

Section: Introductionmentioning

confidence: 99%

The Rotating Cavitation Performance of a Centrifugal Pump with a Splitter-Bladed Inducer under Different Rotational Speed

Guo¹,

Zhu²,

Cui³

et al. 2015

International Journal of Turbo &Amp; Jet-Engines

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Designing inducer is one of the effective ways to improve the suction performance of high-speed centrifugal pumps. The operation condition including rotational speeds can affect the internal flow and external performance of high-speed centrifugal pumps with an inducer. In order to clarify the rotating cavitation performance of a centrifugal pump with a splitter-bladed inducer under different rotational speed, a centrifugal pump with a splitter-bladed inducer is investigated in the work. By using Rayleigh-Plesset equations and Mixture model, the cavitation flow of centrifugal pump is numerically simulated, as well as the external performance experimental test is carried out. It is found that the cavitation area increases with the rotational speeds. The location of the passage where cavitation is easy to appear is explored. Asymmetric cavitation behavior is observed. That, the trail of the inducer is easy to take cavitation when the rotational speed is increased to a degree, is also observed. The trend of NPSH r obtained by the simulation and experimental test is in general agreed. NPSH r increases with the rotational speed, which means that the anti-cavitation performance of the pump is deteriorated with the rotational speed.

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On high efficiency operation of contra-rotating axial flow pump with rotational speed control toward effective energy saving

Cited by 3 publications

References 2 publications

Research on Two-Way Contra-Rotating Axial-Flow Pump–Turbine with Various Blade Angles in Pump Mode

Research on Two-Way Contra-Rotating Axial-Flow Pump–Turbine with Various Blade Angles in Pump Mode

Hydraulic Optimization of Two-Way Counter-rotating Axial Flow Pump Turbine

The Rotating Cavitation Performance of a Centrifugal Pump with a Splitter-Bladed Inducer under Different Rotational Speed

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