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Research Papers: Multiphase Flows

Frictional Loss Studies and Experimental Performance of a New Synchronal Rotary Multiphase Pump

[+] Author and Article Information
Xu Yang1

School of Energy and Power Engineering,  Xi’an Jiaotong University, 28 Xianning West Road, Xi’an, 710049, People’s Republic of Chinayangxu0924@hotmail.com

Zongchang Qu

School of Energy and Power Engineering,  Xi’an Jiaotong University, 28 Xianning West Road, Xi’an, 710049, People’s Republic of Chinazchqu@mail.xjtu.edu.cn

Yuyuan Wu

School of Energy and Power Engineering,  Xi’an Jiaotong University, 28 Xianning West Road, Xi’an, 710049, People’s Republic of Chinayywu@xjtu.edu.cn

1

Corresponding author.

J. Fluids Eng 133(4), 041303 (May 12, 2011) (9 pages) doi:10.1115/1.4003986 History: Received August 20, 2010; Revised April 06, 2011; Published May 12, 2011; Online May 12, 2011

A new synchronal rotary multiphase pump (SRMP) is presented, which is geometrically simple and easy to manufacture. With the rotary cylinder, the frictional losses between the major components of the SRMP are minimized. Its structural design and working principles are introduced. The mathematic models of the frictional losses at various friction-couplings are formulated. Calculations on the frictional losses and mechanical efficiency are performed for a SRMP prototype, too. Experimental works on the prototype in which crude oil is used as working fluids are conducted to validate the functionality of the SRMP and the established models. The calculated results show that the frictional losses in the SRMP are mainly produced by the friction from bearings and seals. The frictional losses caused by the other part of components occupy less than 13% of the total frictional losses. In addition, the theoretical analyses of the various shaft speeds and basic geometrical parameters reveal that the cylinder rotary inertia exercises a negative effect on the friction at the sliding vane sides. Lower shaft speed and smaller eccentricity-cylinder radius ratio are helpful to reduce this effect. In the experiment, the SRMP is operated at shaft speeds of 400, 600 and 800 rpm respectively. The pressure differences are arranged within 0–2.4MPa. The measured values of the shaft consumption powers are shown to be in good agreement with the calculations. These results confirm that the SRMP is suitable for multiphase transportation and has a higher mechanical efficiency.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 2

Schematic diagram of the working process

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Figure 3

Forces on the sliding vane

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Figure 4

Forces on the rotor and cylinder

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Figure 5

Definition of infinitesimal element in the frictional region on the rotor end face

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Figure 6

Calculated results for one shaft revolution: (a) relative velocities at sliding vane side and vane joint; (b) contact forces at sliding vane sides and vane joint; (c) radial forces on rotor and cylinder; (d ) angular velocities of rotor and cylinder

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Figure 12

Comparison of measured and calculated mechanical efficiencies

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Figure 11

Comparison of measured and calculated shaft consumption powers

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Figure 8

Effects of the (a) eccentricity-cylinder radius ratio, and (b) cylinder length-radius ratio on the frictional losses and mechanical efficiency

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Figure 7

Effects of the shaft speed on: (a) tangential force at vane joint, and (b) contact force at sliding vane sides at pressure difference of 1.4 MPa; effects of the shaft speed on: (c) frictional loss at sliding vane sides, and (d ) mechanical efficiency at various pressure differences

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Figure 1

Structure of the SRMP: (a) front sectional view, (b) side sectional view

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