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Self-Starting Analysis of an OWC Axial Impulse Turbine in Constant Flows: Experimental and Numerical Studies

Authors
Cui, YingLiu, ZhenZhang, XiaoxiaXu, ChuanliShi, HongdaKim, Kilwon
Issue Date
1월-2019
Publisher
ELSEVIER SCI LTD
Keywords
Wave energy; Oscillating water column; Impulse turbine; Experimental study; Transient numerical model; Self-starting performance
Citation
APPLIED OCEAN RESEARCH, v.82, pp 458 - 469
Pages
12
Journal Title
APPLIED OCEAN RESEARCH
Volume
82
Start Page
458
End Page
469
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/362
DOI
10.1016/j.apor.2018.11.014
ISSN
0141-1187
1879-1549
Abstract
In recent times, self-rectifying axial-flow air turbines are being widely employed in oscillating water column (OWC) wave energy converters (WEC). The steady performance of air turbines has been systematically investigated in previous studies. However, there still exists a lack of information on their unsteady performance, such as in the self-starting characteristics and subsequent running behavior. In this study, the unsteady behavior of impulse turbine under various constant-flow conditions is investigated. Experimental studies were conducted to investigate the effects of constant-load on the variations in the rotation speed, the pressure drop and the torque output of the turbine starting from rest. A fully passive flow-driving numerical model is employed for further detailed analysis of the flow and pressure fields. Followed by a well-agreed validation using the corresponding experimental data, the three dimensional (3D) transient model is used to study the effects of the airflow velocity magnitude and the rotors' moment of inertia on the self-starting performance of the turbine. Except for the variations in the rotation speed, the pressure drop and the pneumatic torque, the distributions of the flow-field and the pressure over the blades at specific time-points are analyzed.
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친환경해양개발연구본부
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