• 許 家昆

Student thesis: Master's Thesis


The diffuser augmented wind turbine (DAWT) (or so called ducted wind turbine) was believed to have a good wind power energy conversion effect It was realized that a DAWT design has aerodynamic advantages over traditional horizontal axis wind turbine (HAWT) in converting wind energy to electric power In this research numerical simulations of a DAWT were performed at multiple yaw angles (10 degrees to 90 degrees at intervals of 10 degrees) at different rotational speeds with the help of computational fluid dynamics (CFD) technique The main purpose of this research is to understand flow physics and performance variation of DAWT at different yaw angles This study helps to operate the DAWT safely during high wind conditions Power outputs of DAWT at 10 degrees to 90 degrees of yaw angles at different rotational speeds were calculated Power output curves of DAWT at 10 degrees to 90 degrees of yaw angles were compared with power output curve at zero degree of yaw angle The comparison of numerical results shows that power output of DAWT decreased significantly as the yaw angle increases from 0 degrees to 90 degrees respectively Changing yaw angle is an effective way to operate DAWT at high wind conditions
Date of Award2018 Jan 22
Original languageEnglish
SupervisorJiin-Yuh Jang (Supervisor)

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