Blade Rows Interaction of Contra-Rotating Axial Flow Pump in Pressure Field on Casing Wall

Furukawa, Akinori; Takano, Tomoya; Shigemitsu, Toru; Okuma, Kusuo; Watanabe, Satoshi

doi:10.1299/jsmeb.49.670

Cited by 4 publications

(4 citation statements)

References 4 publications

(6 reference statements)

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“…∂V θ r ∂m is called blade load. Its integration along the meridional distance is the total velocity circulation from the leading edge to the trailing edge, as presented in Equation (15), which denotes the work-doing capacity of the blade. The relationship between the pump's head and the velocity circulation [23] is presented in Equation ( 16).…”

Section: Slm Pump Blm Pumpmentioning

confidence: 99%

“…The results showed that the size and strength of the suction side perpendicular cavitating vortices grew with the decrease of pressure, resulting in the degradation in pump's performance. Furukawa et al [15] investigated the blade row's interaction between the front and rear rotors of an axial flow pump. The result showed that the pressure fluctuation in the front rotor was bigger than that in the rear stator.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Cavitation in Two Axial-Flow Water Jet Propulsion Pumps

Lai

2023

Processes

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To investigate the appropriate design method of the water jet pump, numerical simulations are carried out to compare the cavitation in two pumps designed by the streamline method and the blade load method. Based on a brief description of the design methods, the internal flow fields and cavitation in the two axial flow water jet propulsion pumps are studied by using the SST k−ω turbulence model and barotropic law cavitation model. The cavitation location, disturbance velocity field, blade load, and their variations with the cavitation number are analyzed. The results show that the pump designed by the blade load method has a smaller cavitation bubble than the pump designed by the streamline method. With the decrease of cavitation number, the vapor bubbles first appear at the blade tip of the leading edge and then extend from the leading edge to the trailing edge. The bubble thickness and the area of the low pressure on the suction surface also increases. A whirl in the disturbance velocity is observed, which turns the direction of incoming flow to the cavitation area. Furthermore, the head drop of water jet pump is related to the decrease of blade load. The results also show that at the point of cavitation number equal to 0.319, an unexpected peak of head in the pump designed by the streamline method is observed, which indicates an unstable working point for the pump. If the priorities are anti-cavitation performance and high efficiency at the design condition, the blade load method is the first choice to design pumps. While the streamline method should be adopted if high efficiency at large flow rates is preferred.

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Section: Slm Pump Blm Pumpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of Cavitation in Two Axial-Flow Water Jet Propulsion Pumps

Lai

2023

Processes

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“…The grey-colored region means the backflow region where the local axial velocity is negative. The corresponding distribution of the casing wall static head-rise from the front rotor inlet [8] is plotted in Fig. 5.…”

Section: Fig 1 Sectional View Of Test Pumpmentioning

confidence: 99%

Internal Flow and Limiting Streamlines Observations of Contra-Rotating Axial Flow Pump at Partial Flow Rate

Watanabe

Momosaki

Usami

et al. 2011

International Journal of Fluid Machinery and Systems

Self Cite

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An application of contra-rotating rotors, in which a rear rotor is in tandem with a front one and these rotors rotate in the opposite direction each other, has been proposed against a demand for developing higher specific speed axial flow pump. One prototype rotors, which we have designed with a conventional method, has given the positive slope of head characteristic curve especially in the rear rotor. It is necessary to understand the internal flow behavior in the rear rotor to establish the design guideline for achieving higher and more reliable performance. In the present study, we carried out the experimental investigations of the internal flow field of the rear rotor, especially at the partial flow rate, by Laser Doppler Velocimetry (LDV) for the main flow and the limiting streamlines observation on rotor surfaces for the boundary layer flows.

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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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Blade Rows Interaction of Contra-Rotating Axial Flow Pump in Pressure Field on Casing Wall

Cited by 4 publications

References 4 publications

Comparison of Cavitation in Two Axial-Flow Water Jet Propulsion Pumps

Comparison of Cavitation in Two Axial-Flow Water Jet Propulsion Pumps

Internal Flow and Limiting Streamlines Observations of Contra-Rotating Axial Flow Pump at Partial Flow Rate

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

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