Blade rows interaction in contra-rotating axial flow pump designed with different rotational speed concept

Cao, Linlin; Watanabe, Satoshi; Imanishi, Toshiki; Yoshimura, Hidetoshi; Furukawa, Akinori

doi:10.1088/1757-899x/52/2/022004

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…9 (b), it could be easily seen that the RR2 pair's pressure field between the two blade rows is majorly dominated by the low pressure regions of the rear rotor, and the front rotor's high pressure regions are limited in the narrow ranges closed to its pressure surfaces. Hence, in the RR2 rotor pair, the static pressure was believed to be significantly decreasing from the front rotor downstream to the upstream of the rear rotor, which was pertinently confirmed by the axial distribution of circumferentially averaged casing wall pressure [18] shown in Fig. 10.…”

Section: 2pressure Distribution In Both Rotor Pairs At Off Design Cmentioning

confidence: 63%

Experimental Investigation of Blade-To-Blade Pressure Distribution in Contra-Rotating Axial Flow Pump

Cao

Watanabe

Honda

et al. 2014

International Journal of Fluid Machinery and Systems

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As a high specific speed pump, the contra-rotating axial flow pump with two rotors rotating reversely has been proved with higher hydraulic and cavitation performance, while in our previous researches, the potential interaction between two blade rows was distinctly observed for our prototype rotors designed with equal rotational speed for both front and rear rotors. Based on the theoretical and experimental evidences, a rotational speed optimization methodology was proposed and applied in the design of a new combination of contra-rotating rotors, primarily in expectation of the optimized blade pressure distributions as well as pertinently improved hydraulic performances including cavitation performance. In the present study, given one stationary and two rotating frames in the contra-rotating rotors case, a pressure measurement concept taking account of the revolutions of both front and rear rotors simultaneously was adopted. The casing wall pressure data sampled in time domain was successfully transferred into space domain, by which the ensemble averaged blade-to-blade pressure distributions at the blade tip of two contra-rotating rotors under different operation conditions were studied. It could be seen that the rotor pair with the optimized rotational speed combination as well as work division, shows more reasonable blade-to-blade pressure distribution and well weakened potential interaction. Moreover, combining the loading curves estimated by the measured casing wall pressure, the cavitation performance of the rotor pairs with new rotational speed combination were proved to be superior to those of the prototype pairs.

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Section: 2pressure Distribution In Both Rotor Pairs At Off Design Cmentioning

confidence: 63%

Experimental Investigation of Blade-To-Blade Pressure Distribution in Contra-Rotating Axial Flow Pump

Cao

Watanabe

Honda

et al. 2014

International Journal of Fluid Machinery and Systems

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“…The pump's impeller rotates clockwise, and the blade disc rotates counterclockwise. This creates a contra-rotating effect between the discs (bd), which transmits much more energy to the fluid than conventional centrifugal pumps [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Impact of the Closed, Semi-Opened, and Combined Contra-Rotating Stages on Volume Loss Characteristics

Kulikov

Ratushnyi

Moloshnyi

et al. 2022

JES

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The article is devoted to studying the contra-rotating stages with different impellers and blade discs. Determining the reduction of volumetric losses by modeling the contra-rotating stages in the software package ANSYS CFX. The work aimed to create and study the flow and characteristics: semi-open, closed impellers, and blade discs. As a result of the work, the following contra-rotating stages were determined and compared: the semi-opened impeller with the semi-opened blade disc; the closed impeller with the closed blade disc; the semi-opened impeller with the closed blade disc; the closed impeller with the semi-opened blade disc. As a result of research, fluid flows in contra-rotating stages and their characteristics in the form of pressure and efficiency were obtained. According to the obtained data, the expediency of using contra-rotating stages as a working body of the pump is written.

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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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Blade rows interaction in contra-rotating axial flow pump designed with different rotational speed concept

Cited by 5 publications

References 3 publications

Experimental Investigation of Blade-To-Blade Pressure Distribution in Contra-Rotating Axial Flow Pump

Experimental Investigation of Blade-To-Blade Pressure Distribution in Contra-Rotating Axial Flow Pump

Impact of the Closed, Semi-Opened, and Combined Contra-Rotating Stages on Volume Loss Characteristics

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

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