Abstract
To improve the transport performance of a rotodynamic multiphase pump for a gas–liquid mixture, we took the head and efficiency index at rated flow rate with 15% inlet gas volume fraction as the indices, and used the orthogonal test design method and CFD technology to optimize. We selected the blade shroud angles at the leading edge and trailing edge, and axial length of the impeller, as well as the inlet incidence angle and blade number of the diffuser, and a total of five factors were used for the orthogonal test. The weight function was used to determine the final trial protocol. The results showed that the blade shroud angle at the trailing edge had the greatest influence on the head and efficiency indices. Under the rated flow rate with a 15% inlet gas volume fraction, the head and efficiency of the optimized pump were increased by 2.81 m and 5.6%, respectively, in comparison to the base pump. After the optimization, the partial fast-speed regions at the inlet of the impeller passage and the partial low-pressure regions on the blade suction side of the impeller disappeared, the accumulation of the gas phase on the blade suction side at the impeller outlet was suppressed, and the pumping performance of the impeller using the gas–liquid mixture was improved greatly. This study provides an important theoretical basis for the optimization and design of a multiphase pump.
Highlights
Energy is closely related to the development of human society
Compared with the base model, the efficiency and head increased by 5.6% and 2.81 m, respectively, which proved that the optimization of the orthogonal test method combined with the weight function was feasible
7b,gas–liquid the efficiency and head of the optimized pump greatlyofimproved compared with the the two-phase conditions, but the improvement the performance under pure water conditions was not significant. This was because the purpose of this study was to optimize the transport performance under gas–liquid two-phase conditions, so the improvement of efficiency and head under pure water conditions was of less importance
Summary
Energy is closely related to the development of human society. The exploitation and consumption of oil and gas resources is increasing at faster rate. As the onshore oilfields gradually run out of resources, more offshore oilfields are being constructed [1,2]. The crude oil is often mixed with sand, water, and gas when exploited from the abysmal sea. The presence of gas and sand makes the pressurization and transportation of crude oil very difficult. In the process of such pressurization and transportation, the rotodynamic multiphase pump has attractive development prospects, due to its good performance in pumping a high gas volume fraction mixture with particles [3]
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