Dr. Uzu-Kuei HSU

Dean of the Air Force Institute of Technology (AFIT), TAWIAN


Talk Title
A Wind Turbine with Starting Quickly in Weak Inflow and Working Stably in Strong Inflow
Talk Abstract

Horizontal axis and vertical axis models constitute the two main types of wind turbine designs and can be distinguished by their appearances. The CP is close to 0.4 for a good-designed wind turbine. It is not only caused the structure failure of the wind turbine by the high wind speed, but also reduced the wind power transfer by the wind drag. The low efficiency bypass flow is induced by the reverse pressure because the wind flow is not easily through the wind power system. A kind of design, wind cup, was applied to deal with this problem, and it can increase the CP about 5~10%. However, the problems still exist in “reverse pressure” and “cut speed” in high wind speed. This study is to develop a device which produces high-pressure tailing jet. For the horizontal axis wind turbine, it can accelerate the rotation to increase power output in low speed, and produce a stable anti-torque force to wind turbine in high speed. It becomes the all day long operations, not only to overcome the problem of reversed pressure in high speed and cut off wind speed. It greatly enhances the CP value, and structure of the wind turbine is more robust and easy to control. It provides a new thinking for wind turbine design. This study analyzed an airfoil blade for a horizontal-axis wind turbine (HAWT) with a trailing-edge jet flow design. This design was realized by drilling a hole in the trailing edge of an NACA0018 blade of a conventional HAWT to serve as a pressure injection nozzle. Five inflow wind speeds and threeCflow conditions were examined in the test. The results revealed the efficiency differences between a HAWT with the new jet flow design and conventional HAWTs. The experimental methods employed involved a wind tunnel experiment and a computational fluid dynamics (CFD) simulation. In this study, a HAWT was developed with a trailing-edge jet flow design. The experimental and simulation results revealed that with a low inflow wind speed, this design could assist in accelerating the turbine startup or and power output thereby overcoming the shortcomings of an HAWT. With a high inflow wind speed, this design caused a damping effect, which lowered the rotation speed and stabilized the turbine. These characteristics will allow this type of HAWT to operate efficiently under all weather conditions. 

Wind turbine, Qucikly Starting, Reversed pressure, Cut off wind speed,Trailing edge jet
Short Biography

Uzu-Kuei HSU: He is the dean of the Air Force Institute of Technology (AFIT), TAWIAN; he took the post in August 2014. Before becoming dean, Dr. HSU served as a faculty member of the Department of Aircraft Engineering at AFIT and the Air Force Academic School (AFAS) for over 25 years. In addition to his teaching and research activities, he was also appointed director of several administrative departments of the university, such as the dirctor or chairman, etc. He was also appointed Air Force colonel at AFIT from 2014 to now. Dr. HSU earned his bachelor degree in aircraft engineering from AFIT, and a master’s degree in aircraft engineering from Chung-Cheng Institute of Technology (CCIT). He earned his Ph.D. in aircraft engineering from National Cheng Kung University (NCKU). With this academic background, his previous research focused on the algorithm development of the computational fluid dynamics and its application including of shock wave, two phase flow, fluid-structure interaction, turbo-machinery, wind turbine, and green power system. He had jointed the design for the Supersonic Tactical Missile-HF2 and high performance fighter- IDF in Taiwan. Patents:43, Journal paper:66, Technic note:219

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