Numerical simulation of internal flow in a contra-rotating axial flow pump

Momosaki, S; Usami, Satoshi; Watanabe, Satoshi; Furukawa, Akinori

doi:10.1088/1755-1315/12/1/012046

Cited by 18 publications

(16 citation statements)

References 1 publication

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“…Such severe blade rows interactions and consequent deficiencies were confirmed in the experiments and the numerical simulations for our prototype contra-rotating rotors [7,8], in which both rotors were designed with the equal head rise (H f =H r =2m) as well as the same rotational speed (N f =N r =1225rpm).…”

Section: Introductionsupporting

confidence: 60%

“…In our previous investigations by both the experimental and the simulation approaches [8], under the design condition, the tip parts of the RR2 blades were found with negative incidence angles and stagnation points located at the suction surfaces, which was known as fairly unfavorable for the cavitation performance [17]. From Fig.…”

Section: 1pressure Distribution In Both Rotor Pairs At Design Condimentioning

confidence: 99%

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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: Introductionsupporting

confidence: 60%

Section: 1pressure Distribution In Both Rotor Pairs At Design Condimentioning

confidence: 99%

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 negative incidence angle i (i=β r1 -β b1 ) is observed, which is known as unfavorable to inlet shock-loss and cavitation performance, due to which the stagnation point locates on the blade suction surface near the blade leading edge [6]. The positive incidence angle is considered as one of the most important design principles during the design of the new rear rotor.…”

Section: Negative Incidence Angle Of Rear Rotormentioning

confidence: 99%

“…Our previous numerical simulation for RR2 rotors [6] has shown that, even at the design flow rate, the transient simulation with whole blade passage models of both front and rear rotors is necessary for quantitative evaluations of pump performances. In addition, the total number of the calculation nodes up to 1.1 million for the whole passages, where 10 nodes are distributed between the blade tip end and the casing wall, has been found to be sufficient to reproduce the overall flow field inside the blade passages of the front and rear rotors as well as the detailed flow structures such as the tip leakage flow.…”

Section: Performance Evaluation By Cfdmentioning

confidence: 99%

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Low Speed Design of Rear Rotor in Contra-Rotating Axial Flow Pump

Cao¹,

Watanabe²,

Momosaki³

et al. 2013

International Journal of Fluid Machinery and Systems

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The application of contra-rotating rotors for higher specific speed pump has been proposed in our studies, which is in principle effective for reducing the rotational speed and/or the pump size under the same specification of conventional axial flow pump. In the previous experiments of our prototype, the cavitation inception at the tip region of the rear rotor rather than that of the front rotor and the strong potential interaction from the suction surface of the rear rotor blade to the pressure surface of the front one were observed, indicating the possibility to further improve the pump performance by optimizing rotational speed combination between the two rotors. The present research aims at the design of rear rotor with lower rotational speed. Considering the fact that the incoming flow velocity defects at the tip region of the rear rotor, an integrated inflow model of 'forced vortex' and 'free vortex' is employed. The variation of maximum camber location from hub to tip as well as other related considerations are also taken into account for further performance improvement. The ideas cited above are separately or comprehensively applied in the design of three types of rear rotor, which are subsequently simulated in ANSYS CFX to evaluate the related pump performance and therefore the whole low speed design idea. Finally, the experimental validation is carried out on one type to offer further proofs for the availability of the whole design method.

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Investigation of the influence of various numbers of impeller blades on internal flow field analysis and the pressure pulsation of an axial pump based on transient flow behavior

Al‐Obaidi

2020

Heat Trans

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In the current study, the flow behavior in an axial pump through changing the number of impeller blades is analyzed. Due to the number of blades being very important geometrical parameters in the pump, the study of the influence of various numbers of blades on flow and pressure pulsation in the pump is carried out using the computational fluid dynamics technique. The sliding mesh with the standard turbulence k-ε model is used to investigate the unsteady flow with several flows and impeller blades. Pump performance prediction results with available experimental data indicate reasonable and good agreement with each other. Static pressure, shear stress, and different velocity compounds are qualitatively analyzed. Moreover, the fluctuation pressure and average pressure under different operating conditions and impeller blades are quantitatively investigated. The numerical results show that the impeller blade has a high impact on pressure, shear stress, magnitude velocity, axial velocity, radial velocity, tangential velocity, and average pressure. Furthermore, this numerical study provides good and useful information for the hydraulic design of axial pumps. K E Y W O R D Saverage pressure, axial flow pump, number of impeller blade, pressure fluctuation, shear stress, static pressure

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Numerical simulation of internal flow in a contra-rotating axial flow pump

Cited by 18 publications

References 1 publication

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

Low Speed Design of Rear Rotor in Contra-Rotating Axial Flow Pump

Investigation of the influence of various numbers of impeller blades on internal flow field analysis and the pressure pulsation of an axial pump based on transient flow behavior

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