Abstract
In oil and gas exploitation, the multiphase pump is a vital piece of equipment to guarantee production with high efficiency and stable operation. The complicated pattern of multiphase flow in the multiphase pump affects the pump performance; for this reason, the multiphase performance and the inner flow should be sufficiently investigated. In the present work, a liquid-gas multiphase pump is designed and manufactured, and then tested in a specialized test rig to reveal the transient pressure characteristics of the multiphase pump. Results show that the dominant frequency under water and water-air conditions is the blade passing frequency, which is induced by the rotor stator interaction. In the downstream of the impeller, the pressure fluctuation is obviously weakened, because the splitter-blade design could improve the control ability of flow pattern in the downstream region. In comparison with water condition, the pressure fluctuation of water-air condition greatly increases, and the multiples of impeller rotating frequency are stimulated due to the movement and merging of air bubbles. Finally, the correlation of transient pressure and phase distribution in impeller is revealed by using a high-speed camera. With the gradual pressure rise from impeller inlet to outlet, the relative movement and separation of two phases induce violent pressure fluctuations.
Highlights
Liquid-gas two-phase pumps have been widely employed in various industry fields like oil-gas transportation, chemical plants and food processing these years
The benefits of splitter blades significantly magnify the exclusion of coefficient, which would lead to severe deterioration in larger are more noticeable in the helico-axial pump than in other rotodynamic pumps because the splitter flowrate
Infrom different and edge circumferential positions, direction, thesection five sensors were distributed bladeaxial leading to trailing edge, and five pressure fluctuation fluctuation sensors were set in the the pump pump shell shell of of the the last last stage stage impeller
Summary
Liquid-gas two-phase pumps have been widely employed in various industry fields like oil-gas transportation, chemical plants and food processing these years. The main difficulty for rotodynamic pumps to transport liquid-gas flow is the separation of two-phase due to the pressure difference. Due to its particular benefits of high practicality and low cost in transporting liquid-gas mixture, the helico-axial pump development method and performance characteristics have been investigated in recent years. Liu et al [22] numerically studied the interphase forces of gas-liquid flow in a multiphase pump, and results show that the velocity difference and phase volume fraction are the main drive for drag force, virtual mass force, lift force and turbulent dispersion force, respectively. Zhang et al [23,24] mainly carried out the visualization test on a helico-axial pump to investigate the liquid-gas flow pattern and its influencing factors like flow rate, rotation speed and gas proportion. The multiphase performances are obtained, and the transient pressure field is monitored and analyzed to provide an in-depth understanding on the multiphase mechanism in the pump passages
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