• Ocean and Polar Research
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• 제41권3호
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• pp.193-202
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• 2019

There have been various approaches for efficiency improvement of a Darrieus tidal stream turbine after it was introduced as an alternative of horizontal axis turbines. Among the approaches, the researches on the interaction effect of dual configuration were conducted. In this study, a dual Darrieus turbine with a coupling mechanism was proposed for investigating the interaction effect. Also, the effect of bi-directional tidal stream was analyzed with prototype fabrication, apparatus set-up and experiment conduction in indoor and offshore facilities. As the results of the experiments, the dual turbine in case of counter-rotation and inflow between the turbines improved efficiencies by 9.5% and 11.31%, respectively, as compared to the single turbine. Also, the dual turbine in case of the inflow improved efficiencies by 9.4% and 16.62%, respectively, as compared to that in case of outflow between the turbines which represented the case of 180 degrees change of flow direction after slack water. Therefore, the proposed dual turbine showed the advantage in terms of the efficiency as compared to the single turbine and the effect level of the slack water on the performance of the dual turbine was investigated.

• 한국해양환경ㆍ에너지학회지
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• 제13권4호
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• pp.241-248
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• 2010

본 논문은 조류발전을 위하여 가장 보편적으로 사용되는 수직축 조류발전 터빈의 하나인 다리우스 터빈의 효율에 미치는 다양한 설계변수의 영향을 살펴보기 위하여 수행하였다. 날개 수, 코드 길이, 피치 및 캠버를 설계변수로 채택하였으며, 2차원 및 3차원 비정상 난류유동해석을 위하여 FLUENT의 RANS방정식과 k-e 난류모델을, 격자계 모델링을 위하여 GAMBIT을 이용하였다. 기본적인 수치해석방법은 정현주 등(2009)을 참조하였다. 설계변수 변경에 따른 방대한 계산 량을 감안하여 수치해석의 신뢰도가 허락하는 범위에서 대부분 2차원 해석으로 결과를 도출하였다. 본 연구에서 제시한 설계변수의 최적화를 통하여 기준모형보다 월등한 성능을 보이는 고효율 수직축 터빈 모델을 제시할 수 있었다.