Abstract
For the purpose of improving the transport capability of the mixed transport pump, a new self-made three-stage deep-sea multiphase pump was taken as the research object. Based on the Euler-Euler heterogeneous flow model, liquid (water) and gas (air) are used as the mixed media to study the external characteristics and internal flow identities of the mixed pump under different gas volume fraction (GVF) conditions. According to the simulation results, a local optimal design scheme of the diversion cavity in the dynamic and static connection section is proposed. The numerical results before and after the optimization are compared and analyzed to explore the effect of the diversion cavity optimization on the performance, blade load and internal flow identities of the pump. The results show that the head and efficiency are obviously improved when the inner wall of the diversion cavity is reduced by 4 mm along the radial direction. After optimization, under the condition of 10% gas content, the head and efficiency is increased by 3.73% and 2.91% respectively. Meanwhile, the hydraulic losses of the diversion cavity and diffuser are reduced by 9.11% and 4.32% respectively. The gas distribution in the impeller is improved obviously and the phenomenon of a large amount of gas phase accumulation is eliminated in the channel. In addition, the abnormal pressure load on the blade surface is eliminated and the turbulent flow energy intensity is reduced. The average turbulent kinetic energy ( T K ) at i = 0.51 of the first stage impeller passage is reduced by 35%. Finally, the reliability of the numerical method is verified by the experimental results. To sum up, the performance and internal flow identities of the optimized mixed transport pump are improved, which verifies the availability and applicability of the optimization results. This provides a reference for the research and design of a multiphase mixed transport pump in the future.
Highlights
Since the 21st century, in order to obtain more fossil fuel resources, countries around the world have begun to vigorously develop equipment for deep-sea oil drilling and transportation
Size Determination selected for the optimization calculation, and the external characteristics are analyzed under two workingBased conditions: and 10%and inletexperimental gas content.results
Eight schemes are selected for the optimization calculation, and the external characteristics are analyzed under two Optimization dimension the diversion cavity
Summary
Since the 21st century, in order to obtain more fossil fuel resources, countries around the world have begun to vigorously develop equipment for deep-sea oil drilling and transportation. The mixed transport pump is mainly used in the oil industry. It is used to directly pressurize and deliver the gas-liquid mixed fluid. It can reduce production cost and simplify production management, which has great economic value and research significance [1]. Many exploitation problems have been solved gradually under the constant research and innovation of scientists and engineers. Many technical problems in the field of deep-sea gas-liquid transportation still need to be further studied [2]
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