Experimental investigation of blade number and design effects for a ducted wind turbine
Abstract Over the recent decades, many different ducted turbines have been designed to augment efficiency of wind turbines. The design and number of blades are the most important parameters to optimize efficiency of wind turbines. In this paper, effects of design, number and attack angles of blades on rotational speed are experimentally studied in a duct which increases wind velocity up to 2.46 times numerically and 2.32 times experimentally as great as far-field flow. In order to realize this, 3 different types of aerodynamic blades were designed and then, 2-bladed, 3-bladed and 4-bladed impellers were created by these blades; finally, 9 impellers were built on aggregate. The rotational speed of each impeller was recorded at 7 attack angles in two operating states with and without the duct at the same conditions in a wind tunnel. Results demonstrate that firstly, the rotational speed is reduced by adding more blades; secondly, the impellers with wide top blades have lower rotational speeds; thirdly, the rotational speed is augmented by increasing attack angle from 0 to 75°; therefore, the rotational speed increase ratio is dependent on these 3 parameters and the wind velocity increase ratio at the throat as well. Highlights Rotational speeds of the impellers were augmented more than 2.1 times by the duct. Greater blockage was observed in the ducted turbine more than the bare one. More resistant force was exerted to WP impellers due to larger surface on the head. The attack angle of 75° had the most rotational speeds among the tested angles.
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기