Basic and Experimental Study of Contra-Rotating Axial Flow Pump.

明徳, 古川; 銀春, 曹; 九州男, 大熊; 貴裕, 眺野; 聡, 渡邉

doi:10.1299/kikaib.67.1184

Cited by 4 publications

(6 citation statements)

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“…Pump head H=4.0m and flow rate Q=70 l/s were specified in pump design. When specific speed of each rotor was determined as N s =1500[min -1 , m 3 /min, m], the rotational speed was obtained (2) as N f =N r =1225min -1 for the contra-rotating RR type under the condition of front and rear rotors head H f =H r =H/2. The blade rows were designed by using conventional empirical method (2) and RR type has 4 front rotor blades and 3 rear rotor ones.…”

Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

“…On the other hand, in the case of the rear rotor, low velocity region is not observed in blade-to-blade region as measured pressure distribution in Fig.7 and calculated velocity distribution in Fig.8. It is considered as the reason that in this RR type rear rotor head is not satisfied with the designed value (2) and the leakage flow from the blade tip becomes weakened in comparison with the front rotor Figure 9 shows the relative velocity distribution in the front rotor at r=95 and 92.5mm. The low velocity region is observed at blade-to-blade region at r=95mm but this low velocity region disappears at radial inner section of r=92.5mm.…”

Section: Methods Of Numerical Analysismentioning

confidence: 99%

“…Based on the working principle of contra-rotating rotors, it is expected to avoid the positive slope of the head characteristic curve. And higher efficiency operation at off-design flow rates might be also possible by controlling rotational speeds of front and rear rotors (2) .…”

Section: Introductionmentioning

confidence: 99%

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Internal Flow Measurement with LDV at Design Point of Contra-Rotating Axial Flow Pump

Shigemitsu

Furukawa

Watanabe

et al. 2009

JFST

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The adoption of the contra-rotating rotor has been proposed in response to a demand for the axial flow pump with higher specific speed. The internal flow field and blade rows interactions between front and rear rotors should be considered in the design for higher performance and more stable operation, but has not been clarified yet. The flow field in contra-rotating axial flow pump was measured at various flow rates with the LDV and wall pressure measurements. In the present paper, the experimental and numerical results in the flow field between front and rear rotors are shown at the design flow rate and the flow behaviors are discussed, related on blade loading, blade tip leakage flow, wake and blade rows interaction.

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Section: Experimental Apparatus and Methodsmentioning

confidence: 99%

Section: Methods Of Numerical Analysismentioning

confidence: 99%

See 1 more Smart Citation

Internal Flow Measurement with LDV at Design Point of Contra-Rotating Axial Flow Pump

Shigemitsu

Furukawa

Watanabe

et al. 2009

JFST

Self Cite

View full text Add to dashboard Cite

show abstract

“…In order to reduce the propeller noise and improve the speed of the vehicle, a counter-rotating pump jet propulsor has been designed which used on the "stingray-1" torpedo [1]. Some research on the Contra-Rotating axial flow pump has been done in Japan [2]. But it is needed on the design method and performance analysis of the contra-rotating pumpjet under the condition of unbalanced shaft power.…”

Section: Introductionmentioning

confidence: 99%

Design and Performance Analysis of Contra-rotating Pumpjet Propulsor under Condition of Torque Unbalance

Wang

Zhang

2018

MATEC Web Conf.

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In order to balance the torque of front rotor and rear rotor of underwater vehicle, the analysis of the speed triangles at the inlet and outlet of the front and rear rotor has been done. Then, the thought of using contra-rotating pumpjet to achieve the objective was raised. The stator is installed behind the rear rotor so as to ensure the overall torque of the propulsor balance, at the same time, the stator can also support the shroud of the propulsor. the parameter design of the rotor and the stator has been carried out by using the three dimensional inverse design method. At last, the performance of the designed pumpjet propulsor is obtained when it is installed on the underwater vehicle By using computational fluid dynamics. The results show that the total torque of the propulsor is reduced to 1.8 N * m on the design point although the power difference ratio of the front rotor and the rear rotor is 20%. The torque ratio is also reduced from 4.6% to 0.4%, which is good to meet the propulsor balance requirement and verifies the 3-D design method of pumpjet is effective.

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“…The contra-rotating axial flow pump has the advantages of large flow, high head and low speed. Therefore, it has been applied as a propulsion device in catamaran and British "stingray-1" torpedo [1][2] . the design method of pump on the current is developing, but its related performance analysis is not much.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional inverse design and hydrodynamic performance analysis of contra-rotating axial flow pump

Wang¹,

Zhang²,

Zhang³

2017

Proceedings of the Advances in Materials, Machinery, Electrical Engineering (AMMEE 2017)

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In order to explore the contra-rotating axial flow pump design method and analysis its hydrodynamic performance, the inlet and outlet velocity triangle of front rotor and rear rotor was analysed, then, a high specific speed contra-rotating axial flow pump was designed using three dimensional method based on the condition of the front rotor outlet circulation equal to the inlet circulation of the rear rotor. At last, the performance of the pump is calculated by using RANS simulation. The results show that: the efficiency of the pump reaches 80.2% on the mass flow design point, namely, the average efficiency of the front rotor and rear rotor is up to 89%. At the same time, the efficiency will decrease rapidly when the mass flow is greater than the design flow. The efficiency of contra-rotating axial flow pump can be maintain higher than 80% by changing the rear rotor speed when the mass flow is in the range of 0.68 d Q~1.07 d Q , which verifies changing rear rotor speed can effectively expand the operation range of pump's high efficiency.

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Basic and Experimental Study of Contra-Rotating Axial Flow Pump.

Cited by 4 publications

References 0 publications

Internal Flow Measurement with LDV at Design Point of Contra-Rotating Axial Flow Pump

Internal Flow Measurement with LDV at Design Point of Contra-Rotating Axial Flow Pump

Design and Performance Analysis of Contra-rotating Pumpjet Propulsor under Condition of Torque Unbalance

Three-dimensional inverse design and hydrodynamic performance analysis of contra-rotating axial flow pump

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