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Effect of gas volume fraction on vortex motion in hydraulic turbine

Shi, GT; Liu, Y; Luo, K; Jiang, XP; Yao, XT; (2018) Effect of gas volume fraction on vortex motion in hydraulic turbine. In: IOP Conference Series: Earth and Environmental Science. (pp. 012117). IOP: Beijing, China. Green open access

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Abstract

In order to analyze the vortex motion in the flow channel of the hydraulic turbine impeller during the gas volume fraction change. Now, the pump with a specific speed of 55.7 is chosen as hydraulic turbine. On the basis of considering the gas compressibility, to take numerical calculation on the model under different flow rates and different gas volume fraction, to analyze the influence of gas volume fraction on vortex motion law in the impeller flow channel. Findings: When the flow rate is small, the relative velocity distribution in the impeller flow channel is uneven, the velocity field is chaotic, and there are obvious vortices, with the increase of the gas volume fraction, the vortices in the impeller flow channel gradually move to the inlet direction of the blade; With the increase of the flow rate, the flow in the channel of the hydraulic turbine impeller is unstable. Both the pressure surface and the suction surface of the blade appear vortices, the vortex region in the impeller flow channel is enlarged, and all of them are concentrated on the back of the blade. The results provide a theoretical basis for the optimal design of hydraulic turbine structures.

Type: Proceedings paper
Title: Effect of gas volume fraction on vortex motion in hydraulic turbine
Event: Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems
Location: Beijing, China
Dates: 16-19 November 2017
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1755-1315/163/1/012117
Publisher version: https://doi.org/10.1088/1755-1315/163/1/012117
Language: English
Additional information: Content from this work may be used under the terms of theCreative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd https://creativecommons.org/licenses/by/3.0/
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/10069552
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