Abstract
The end clearance of the impeller is one of the most important structural parameters in the hydraulic design of a high-speed electrical submersible pump (ESP). In this paper, an ESP with a rotating speed of 6000 r/min was taken as the research object. Numerical calculations were carried out for five different end clearance conditions of 0.1 mm, 0.3 mm, 0.6 mm, 0.9 mm, and 1.2 mm, respectively, to obtain the performance and internal flow field under different situation. The simulation results were verified by the pump performance experiment. It showed that the increase of the end clearance led to a decrease of the head and efficiency of the electrical submersible pump. Through the analysis of the internal flow field, it was found that the existence of the end clearance reduced the flow rate and caused free pre-whirl. With the increase of the end clearance, the phenomenon of de-flow in the diffuser passage was aggravated, which further reduced the performance of the electrical submersible pump. Finally, the reasonable recommended value of the end clearance was given, which facilitated the optimization design and engineering application of the high-speed ESP.
Highlights
Electrical submersible pump (ESP) is a specific multistage centrifugal pump working underwater.The pump and motor are located in the well, and the motor drives the pump to rotate to generate centrifugal force lifting the water or oil in the well to the ground
The highest efficiency appeared at the condition of constant flow rate, the head and efficiency reduced as the end clearance increased
In order to further understand the internal flow field distribution at different end clearance, the second-stage diffuser was opted for flow-field analysis
Summary
Electrical submersible pump (ESP) is a specific multistage centrifugal pump working underwater. Once the aim was to study the effects of geometry parameters on the pump performance for optimal design, computational fluid dynamics (CFD) with RANS models and steady simulation were the first choice for the fast calculation time [30]. There are relatively few studies on the influence of end clearance on the performance machines, including Francis turbine [36,37,38], water turbine [39], and tidal turbine [40]. This testconditions validated the of end on ESP performance simulations of different end clearance wereeffect carried out clearance while ensuring that other design simulations of different end clearance conditions were carried out while ensuring that other design and provided a reference for controlling end clearance during installation. Provided Methods a reference for controlling end clearance during installation
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