Smart Control of Axial Flow Pump Performance by Means of Counter-Rotation

Kanemoto, Toshiaki; Kimura, Shuichi; Oba, Shin; Satoh, Minoru

doi:10.1299/jsmeb.45.293

Cited by 6 publications

(4 citation statements)

References 8 publications

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“…Counter-rotating type impellers Double armature type motor [5]). The counter-rotating impellers driven separately by the isolated motors have been presented by Prof. Shigemitsu et al [6] [7], but the proposed impellers quite differ from them as the impellers are driven, in the smart control, by the peculiar motor with the double rotational armatures.…”

Section: Front Impellermentioning

confidence: 99%

“…The inner and the outer armatures of the motor are connected directly to the front and the rear impellers, respectively. To understand clearly the discussions in the experimental results, the counter-rotations in the smart control (Kanemoto et al [4] [5]) is briefly reinterpreted. The inner and the outer armatures of the AC induction motor work at the conditions that the rotational torques are counter-balanced and the relative rotational speed between both armatures is kept constant, which is specified with the number of the poles and the frequency supplied from the power grid system.…”

Section: Impeller Speeds Predicted In Smart Controlmentioning

confidence: 99%

“…Front Blade A or B was united respectively with Rear Blade A or B at the design process, then the combination of the front and the rear impellers is called Impeller AA or BB. As for Impeller AA (Kanemoto et al, [5]), the blade thicknesses derived from NACA4409 hydrofoil were distributed along the camber lines of the single arc, the twist centres were placed on the middle position of the camber lines, and the solidities of the front and the rear impellers are 0.75 regardless of the radial position. The excess angle was taken into the outlet angle of the blades to get reasonably the free vortex type flow at the front impeller outlet and the axial flow at the rear impeller outlet (Ikui [8]).…”

Section: Model Impeller Profilesmentioning

confidence: 99%

See 2 more Smart Citations

Counter-Rotating Type Pumping Unit (Impeller Speeds in Smart Control)

Kanemoto¹,

Komaki²,

Katayama³

et al. 2011

International Journal of Fluid Machinery and Systems

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Turbo-pumps have weak points, such as the pumping operation is unstable on the positive slope of the head curve and/or the cavitation occurs at the low suction head. To improve simultaneously both weak points, the first author invented the unique pumping unit composed of the tandem impellers and the peculiar motor with the double rotational armatures. The front and the rear impellers are driven by the inner and the outer armatures of the motor, respectively. Both impeller speeds are automatically and smartly adjusted in response to the pumping discharge, while the rotational torques between both impellers/armatures are counter-balanced. Such speeds contribute to suppress successfully not only the unstable operation at the low discharge but also the cavitation at the high discharge, as verified with the axial flow type pumping unit in the previous paper.Continuously, this paper investigates experimentally the effects of the tandem impeller profiles on the pump performances and the rotational speeds against the discharge, using the impellers whose loads are low and/or high at the normal discharge. The worthy remarks are that (a) the unstable operation is suppressed as expected and the shut off power is scarcely large in the smart control, (b) the blade profile contributes to determine the discharge giving the maximum/minimum rotational speed where the reverse flow may incipiently appears at the front impeller inlet, (c) the tandem impeller profiles scarcely affect the rotational speeds, while the loads of the front and the rear impellers are same, but (d) the impeller with the low load must run faster and the impeller with the high load must run slower at the same discharge to take the same rotational torque, and (e) the reverse flow at the inlet and the swirling velocity component at the outlet of the front impeller with the high load require making the rotational speed of the rear impeller with low load fairly faster at the lower discharge.

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Section: Front Impellermentioning

confidence: 99%

Section: Impeller Speeds Predicted In Smart Controlmentioning

confidence: 99%

Section: Model Impeller Profilesmentioning

confidence: 99%

See 1 more Smart Citation

Counter-Rotating Type Pumping Unit (Impeller Speeds in Smart Control)

Kanemoto¹,

Komaki²,

Katayama³

et al. 2011

International Journal of Fluid Machinery and Systems

Self Cite

View full text Add to dashboard Cite

show abstract

“…To investigate experimentally the pump performances, the trial model of the pumping system was prepared as shown in Figure 11, which consists of the counter-rotating type impellers and the motor presented in Figures 6 and 1 (Kanemoto et al, 2002). The inner and outer rotors counter-drive directly the front and rear impellers, and each shaft is equipped with the lantern ring for choking the leakage flow.…”

Section: Performances Of Trial Model Pumping Systemmentioning

confidence: 99%

Proposition of Unique Pumping System with Counter-Rotating Mechanism

Kanemoto¹,

Oba²

2004

The International Journal of Rotating Machinery

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Turbo-pumps have weak points, such as when the pumping operation becomes unstable in the rising portion of the head characteristics and/or the cavitation occurs under the intolerably low suction head. To overcome both weak points simultaneously, this article proposes a unique pumping system with counter-rotating mechanism, which consists of twostage impellers and a peculiar motor with double rotors. The front and the rear impellers are driven by the inner and the outer rotors of the motor, respectively, keeping the relative rotational speed constant and counter-balancing the rotational torque. Such driving conditions not only smartly improve the unstable performance at lower discharge, but also suppress the cavitation at higher discharge, in the optimum cooperation with the impeller works and the rotor outputs.

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