On the Optimum Design of Contra-Rotating Axial Flow Pump

亨, 重光; Shigemitsu, Toru; 明徳, 古川; Furukawa, Akinori; 聡, 渡邉; Watanabe, Satoshi; 九州男, 大熊; Okuma, Kusuo

doi:10.1299/jsmemecjo.2004.2.0_467

Cited by 8 publications

(8 citation statements)

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“…Table 1 shows the primary dimensions of design blade rows for front rotor and two types of rear rotors. One of the rear rotors, RR1 type, was designed by using conventional empirical method, but resulted in insufficient head at the design flow rate and strong blade rows interaction (6) . As these dissatisfactions seemed to be due to narrower flow passage and long blade chord of the rear rotor, the other one, RR2 type, was redesigned.…”

Section: Experimental Apparatus and Measuring Methodsmentioning

confidence: 99%

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

Furukawa

Takano

Shigemitsu

et al. 2006

JSME international journal. Ser. B, Fluids and thermal engineer

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An application of contra-rotating rotors has been proposed against a demand for developing higher specific speed axial flow pump with more compact structure, higher efficiency and higher cavitation performance. The blade rows interaction between front and rear rotors should be taken into account in pump design for stable operation and reduction of unsteady losses. The measurements of static pressure distributions on casing wall with the phase locked sampling method are carried out for two types of the rear rotors. In the present paper the difference of the rear blade interaction and the unsteady pressure fluctuation are clarified. The pressure fluctuations are more remarkable in the front rotor than in the rear rotor and they are caused by rear rotor pressure field. The effects of pressure fluctuations will be discussed in more details toward understanding the blade rows interaction in the contra-rotating axial flow pump.

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Section: Experimental Apparatus and Measuring Methodsmentioning

confidence: 99%

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

Furukawa

Takano

Shigemitsu

et al. 2006

JSME international journal. Ser. B, Fluids and thermal engineer

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“…Moreover, the characteristics of the model impellers are numerically predicted, and the smart control of the pump performances is proved experimentally with the trial model system. The concept of the counter-rotation proposed in this article entirely differs from the conventional impellers (Kodama et al, 1994;Shigemitsu et al, 2002), ship propellers (Caricchi et al, 1994), etc., which are separately driven with the individual motors or engines.…”

mentioning

confidence: 92%

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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“…However, it is an adequate choice to apply the contra-rotating rotors for the small sized-fan because the axial space can be ensured in electrical devices as compared to that of the radial space. In the case of contra-rotating rotors, it is necessary to design a rear rotor considering the unsteady circumferential velocity distributions at the outlet of the front rotor [5]. And it is important to clarify the influence of the wake from the front rotor to the rear rotor on the performance and pressure interaction between front and rear rotors [6].…”

Section: Introductionmentioning

confidence: 99%

Performance and flow condition of small-sized axial fan and adoption of contra-rotating rotors

2010

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Small-sized axial fans are used as air coolers for electric equipments. But there is a strong demand for higher power of fans according to the increase of quantity of heat from electric devices. Therefore, higher rotational speed design is conducted, although it causes the deterioration of the efficiency and the increase of noise. Then the adoption of contra-rotating rotors for the small-sized axial fan is proposed for the improvement of the performance. In the present paper, the performance and the internal flow condition of the small-sized axial fan are shown as a first step of the research for the contra-rotating small-sized axial fan and the important points to apply contra-rotating rotors to the small-sized axial fan are discussed. Furthermore, the numerical flow analysis is conducted to investigate the performance of the contra-rotating small-sized axial fan and internal flow conditions and pressure distributions are clarified and the effect of contra-rotating rotors is considered.

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On the Optimum Design of Contra-Rotating Axial Flow Pump

Cited by 8 publications

References 0 publications

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

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

Proposition of Unique Pumping System with Counter-Rotating Mechanism

Performance and flow condition of small-sized axial fan and adoption of contra-rotating rotors

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