Unsteady flow simulations of Pelton turbine at different rotational speeds

Title
Unsteady flow simulations of Pelton turbine at different rotational speeds
Authors
최민석정영진신유환
Keywords
Pelton turbine; 펠턴 수차; desalination; 담수화; unsteady flow simulaiton; 비정상 유동해석; different rotational speeds; 회전속도 변화
Issue Date
2015-11
Publisher
Advances in Mechanical Engineering
Citation
VOL 7, NO 11, 1-9
Abstract
This article presents numerical simulations of a small Pelton turbine suitable for desalination system. A commercial flow solver was adopted to resolve difficulties in the numerical simulation for Pelton turbine such as the relative motion of the turbine runner to the injector and two-phase flow of water and air. To decrease the numerical diffusion of the water jet, a new topology with only hexagonal mesh was suggested for the computational mesh around the complex geometry of a bucket. The predicted flow coefficient, net head coefficient, and overall efficiency showed a good agreement with the experimental data. Based on the validation of the numerical results, the pattern of wet area on the bucket inner surface has been analyzed at different rotational speeds, and an attempt to find the connection between rotational speeds, torque, and efficiency has been made.
URI
http://pubs.kist.re.kr/handle/201004/50996
ISSN
16878132
Appears in Collections:
KIST Publication > Article
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